2023.08.02.73
Files > Volume 8 > Vol 8 No 2 2023

Study
the effect of essential oils of some plants in protection from Cowpea beetle, Callosobruchus
maculatus in laboratory

1University
of Baghdad, College of Agriculture, Plant Protection Dept. Iraq .
[email protected]
2
University of Baghdad, College of Agriculture, Plant Protection Dept.
Iraq
3
University of Baghdad, College of Agriculture, Plant Protection Dept. Iraq .
[email protected]
* Correspondence: [email protected]
Available
from: http://dx.doi.org/10.21931/RB/2023.08.02.73
ABSTRACT
The
experiments were conducted in laboratory conditions of a temperature of 25± 2C
and relative moisture of 40± 5 % to evaluate the effectiveness of the cinnamon,
lavender and clove essential oils on some biological life aspects of cowpea
beetle, C. maculates. Results of the obligative experiment for the effect
of the oils on insect adult killing showed that the concentration of 5% caused
a mortality percentage averaged 13.33% of the insect males. The mortality
percentage of the insect females was 11.3% for the cinnamon and lavender oils.
The lavender oil had the lowest effect on adult killing, not exceeding 0. For the
effect of the oils on egg laying, clove oil affected the number of eggs highly
at the concentration of 5%, resulting in 2.00 eggs on average. The lowest oil
effect on egg number was for the lavender oil at the concentration of 1%,
leading to an average of 14.73 eggs. The clove oil at the concentration of 5%
showed effectiveness in adult emergence prevention as it was not observed that
any insect emerged.
In
contrast, the same oil at the concentration of 1% had less effect, resulting in
the highest emergence percentage reaching 13.33%. The same applies to the effect
of the plant oils on insect productivity as the clove oil at the concentration
of 5% was the most effective; no insect productivity was recorded, unlike the
concentration of 1%, recorded productivity of 110.2 %. In the facultative
experiment, the highest mortality percentage was recorded using clove oil
against females, as the mortality percentage reached 4.00%. In contrast, the
lowest mortality percentage was recorded using lavender oil against males, where
no killing occurred, as the mortality percentage did not exceed 0.00%. For the effect
of the oils on egg laying, the highest affected oil was cinnamon at a
concentration of 5% as the number of eggs reached 5.60, while lavender oil at 3%
was the least effective; the average number of eggs was 25. Clove oil at a
concentration of 5% had the highest effect in reducing the emergence of the
insect, so the emergence percentage did not exceed 0.33%. In comparison, its
influence was low at 1%, recording the highest emergence percentage (18.67%).
The lowest recorded insect productivity average was from the treatment of the
clove oil at a concentration of 5%, which did not exceed 5.20%, while the
highest productivity average was from the treatment of the lavender oil at 1%,
which reached 89.6%.
Keywords:
essential
oils, Cowpea beetle, Callosobruchus maculatus
INTRODUCTION
Cowpea (Vigna
unguiculata) is one of the essential crops to human nutrition for their
grains containing a high percentage of protein similar to that found in other
legumes enriched with the amino acids lysine and tryptophan. Cowpea seeds can
be eaten directly; they are also used for making flour and nourishing kids.
Cowpea contributes to healing malnutrition and the body's weak structure. It
also has preventive and curative effects on the diseases of atherosclerosis,
arteries and heart muscles, and cancer, as well as the possibility of using it
as animal forage 1,2. The prevalence of cowpea cultivation is the
booming growth in different environmental conditions, including high
temperatures and poor soils with low rain 3.
The cowpea beetle (
Callosobruchus
maculatus Bruchidae:
Coleoptera ) is one of the essential pests on
stored legumes in the warm and tropical areas of the world 4. The
utilization of cowpea seeds decreases due to the destruction caused by the
cowpea beetle infection that decreases the nutrient security of the farmers
dependent on this crop because the utilization of cowpea seeds decreases due to
their destruction caused by the cowpea beetle infection that reduces the
nutrient security of the farmers dependent on this crop because of their weak
living levels 5. Once the insect affects the cowpea crop, it
gradually causes multiple damages, leading to a loss in the weight, nutrient
value, and quality of the stored seeds 6.
Controlling the
stored-grain insects depends mainly upon the manufactured insecticides and
broad-range fumigants that are highly expensive and cause food contamination
resulting from toxic residues. Moreover, many resistance cases of insecticides
used for controlling have been recorded. Thus, controlling the stored insects this
way becomes unsuitable and encourages researchers to rely on safer methods for
humans with less cost 7, such as plant-origin insecticides,
including plant oils, for they are safe and have no side effects. They contain
secondary compounds having different biological effects that are toxic, anti-nutritional,
repellent or anti-growth 8.
Plant essential
plant oils can be used as insecticides in many forms, involving fumigants,
contact insecticides, systemic insecticides, or repellents to control stored
grain insects 9. Numerous studies have been conducted on the effect
of cinnamon, clove and lavender plants in controlling many insect kinds.
Cinnamon powder effectively protected wheat grains against the maize weevil (Sitophilus
zeamais). And it was effective at the concentration of 10 mg/ml against the
same insect 10. Cinnamon oil was also used to control types of mites
11 and showed effectiveness against the red flour beetle ( Tribolium
castaneum ) 12.13 referred that the lavender oil
diluted to 30% in 1, 2- Propanediol repelled the tick nymphs ( Ixodes
ricinus ) by 100%. Karamaouna
14 reported that the LD50 of the lavender
essential oil was 19.8 mg against the nymphs and adults of grape mealybug (Planococcus
ficus). Attia, S
15 mentioned that the lavender oil
concentration of 25µl/l air killed the adults of the pea aphid (Acyrthosiphon
pisum) by 100% three days after the treatment. Germinara
16 concluded that direct subjecting the
adults of the grain weevil (Acyrthosiphon pisum) to the concentration of
449.05 µ/ adult insect of lavender essential oil for 24 and 48 hours killed
91.7 and 100% with LD50 values of 83.8 and 58.3 µl/l respectively while
according to the fumigation method, the mortality percentage was 100% at the
concentration of 42.52% where the LD50 values were 1.57 mg/l and 10.89mg/l for
the absence and presence of wheat grains, respectively. The repellence
percentage at the 1.76 mg/cm2 concentration was 100 % after 120 minutes of
treatment. Paranhos
17 reported that the clove essential oil
killed a high percentage of the beetle (Zabrotes subfasciatus) and
remarkably decreased the eggs laid by the adults. Nerio
18 referred to the active effectiveness
of using clove oil as an insecticide in contact, repellent or fuming; he
reported that it can be an alternative to conventional insecticide in reducing
the high densities of legume weevil and corn weevil. Zeng
19 revealed that the repellent effect of
clove oil at the concentration of 0.2% against the lesser grain borer (Rhyzopertha
dominica) reached 68.2%.
In comparison, the
lethal percentage reached 80% and 51% for the lesser grain borer and rice
weevil, respectively. Jairoce 20
noticed that the two concentrations, 17.9 and 36 µl/g of the clove essential
oil, killed 100% of the bean weevil (Acanthoscelides obtectus) and maize
weevil (S. oryzae) after 24 hours of treatment, where its LC50 was 9.45 and
10.15 µl/g respectively, concluding that the clove essential oil is a suitable
alternative for controlling the store insects. Oliveira
21
reported that the LC50 of the 0.5% clove oil reached 0.88 and 0.73 µl/l air; it
also reduced egg laying and adult emergence by 47.16% and 76.86%, respectively,
while the repellence percentage reached 45%.
This study aimed to
investigate the efficiency of the cinnamon, clove and lavender plant oils in
protecting the cowpea seeds against the infestation by the cowpea beetle.
MATERIALS AND
METHODS
Rearing cowpea
beetle ( C. maculates )
The insect was
reared on red cowpea seeds inside a plastic container with 10 cm diameter and
13 cm height at 25± 2C. The container was covered with gauze fixed with an
elastic band. Healthy ones continually replaced the seeds unsuitable for insect
feeding, perpetuating the colony.
Essential oil
extraction from each cinnamon, lavender and clove
The essential oils
were extracted with a Cleavinger device relying on the steam distillation
method at the Medicinal Plants Unit of the College of Agricultural Engineering
Sciences / University of Baghdad. For preparing the required concentrations, 2
ml of dimethyl sulfoxide solution was added to every 100 ml of oil, then the
concentrations (1, 3, and 5% ) were prepared.
Effect of the
essential oils of cinnamon, clove and lavender on the life of C. maculatus
The cowpea grains
infested by C. maculatus were isolated inside special containers and
kept until new adults' emergence. An amount of 50g of the healthy cowpea seeds
suitable for cultivation was placed in Petri dishes and sprayed with the oil
concentrations, where each was replaced three times. The treated seeds were
placed in a plastic container; next, ten individuals (5 males and 5 females) of
the recent emerging adults of the insect were released to the container covered
with a piece of gauze tightly fixed with an elastic band. The control treatment
was sprayed with just water plus dimethyl sulfoxide solution, which was also
applied to the three replicates. The treated seeds were kept under the
laboratory temperature. Then, data were recorded every 24 hours for five
successive days as the number of dead male and female insects was counted.
Effect of the
essential oils of cinnamon, clove and lavender on egg laying by C. maculatus
The effect of each
oil on the percentage of egg laying was tested by choosing 10 seeds randomly
from each replicate and counting the number of eggs laid by the insects on the
treated seeds (item 1.3).
Effect of the oils
on the number of the emerged adults
In item 1.3 above,
the treated seeds with the insect eggs were left until the eggs hatched and the
insect reached adulthood. The number of emerged adults was calculated based on
the number of holes on the 10 randomly chosen eggs, as each hole represents one
adult.
Effect of the oils
on the productivity percentage of C. maculatus
Having the number
of eggs and the number of adults were counted, the percentage of the insect
productivity was calculated according to the formula:
Insect productivity
= number of emerged insects \ number of egg
x 100
Effect of the
essential oil of cinnamon, lavender and clove on the life of C. maculatus
The method reported
by 22 was adopted with some modifications to test the effect of oils
on insect adult killing. It is based on joining three hollow transparent
plastic arms to a central large plastic bowl. There is a small bowl attached to
each arm. An amount of 50g of the healthy cowpea seeds is taken and treated
with 1% of the cinnamon oil placed in one of the arms of the chemotropism
device. The seeds in the second arm are treated with a concentration of 3%, and
in the third arm are treated with a concentration of 5%. This procedure applies
to the three replicates and lavender and clove oils. The containers are tightly
covered with gauze pieces and tied with elastic bands. Then, 25 pairs of
recently emerged adults (25 males and 25 females) of the insect are released in
the central container tightly covered with gauze and tied with an elastic band.
The device is kept at laboratory temperature for recording data every 24 hours
for 5 days. The dead insects of males and females affected by the different
concentrations of the oils are counted in addition to counting the number of
eggs laid on 10 seeds taken randomly from each replicate and the number of
adults that emerged in 10 seeds taken randomly from each replicate. Finally,
the insect productivity is calculated.
Statistical analysis
The laboratory
experiments were conducted according to the Completely Randomized Design
(R.C.D). The least significant difference (L.S.D) at the probability level of
5% was used to compare the results 23.
RESULTS
Effect of the
cinnamon, lavender and clove plant oils on adult killing of C. maculatus
Results of Table 1
show a significant effect of the different concentrations of the cinnamon,
lavender and clove oils on killing the males and females of C. maculatus.
They were generally observed that increasing the oil concentration increases
its effect. Cinnamon oil at concentrations of 1 and 3% showed a lethal impact
on the insect, illustrated by a corrected mortality percentage averaging 4.66
and 10%, respectively, for the males, with a lower effect on the females where
the corrected mortality percentage was 1.33 and 6.64 %, respectively. The
average corrected mortality percentage was 13.33% for males and 11.33% for
females at a concentration of 5%. For the lavender and clove, the clove oil was
more effective than lavender oil; however, unlike cinnamon oil, clove oil
affecting the females more than the males except for the concentration of 1% as
the corrected mortality percentage was 4% for males and 0 % for females, in
contrary to the two concentrations of 3 and 5% where the corrected mortality
percentage of the females was 8.67 and 11.33% respectively and for the males
was 6.67 and 9.33 respectively. Concerning lavender oil, the highest corrected
mortality percentage was at the concentration of 5%, reaching 9.33% for males
and 4.67% for females. Comparing the oils according to the period, we notice
that the highest effect was by the cinnamon oil a day after the treatment, achieving
a corrected mortality percentage averaged 30% for males that was lower for
females, as the corrected mortality percentage was 23.33%, followed by clove
oil where the corrected mortality percentage averaged 26.66 and 25.55% for
females and males respectively a day after the treatment. The lavender oil
effect was lower in the males and females as the mortality percentage did not
exceed 6.66 and 4.44%, respectively. The oil effect began to reduce gradually
since the second day after treatment.

Table
1. Effect
of the cinnamon, lavender and clove oils on the adult killing of C.
maculatus
Effect of the cinnamon, lavender and clove plant oils
on egg laying by the adults of C. maculatus
Results in Table 2 refer to significant
differences between the plant oils affecting the eggs laid by C. maculatus.
The clove oil at the concentration of 5% was the most effective in that the
average number of eggs in the treated seeds did not exceed 2.06 eggs. The
concentration of the 3% clove oil had an influential role in the egg laid by
the insect at 3.33 eggs, while the number of eggs on the seeds treated by 1%
was 9.33, which also were lower than the control treatment, resulting in 21.33
eggs. Cinnamon oil ranked second in the effect on egg laying on the cowpea
seeds. The average number of eggs treated with concentrations 1%, 3%, and 5%
was 4.53, 5.20, and 5.13 eggs, respectively. The highest number of eggs (14.73)
was on the seeds treated with 1% lavender oil, while the number of eggs
resulted from the two concentrations of 3% and 5% was 13.80 and 10.00 eggs,
respectively. So, it is observed that the effect of these oils at all
concentrations on the egg laid by the beetle was high at the beginning and
reduced during the progression of the days. The highest effect of each oil
concentration was a day after treatment, while the lowest oil effect was often
five days after treatment.

Table
2.
Effect of cinnamon, lavender and clove plant oils on egg laying by adults of C.
maculatus
Effect of cinnamon, lavender and
clove plant oils on the adult emergence of C. maculatus
Table 3 illustrates the effect of
cinnamon, lavender and clove oils on the adult emergence percentage of the
beetle, where the differences between the treatments were significant. The
concentration of 5% of clove oil showed an effect higher than that of the other
two oils in reducing the adult emergence of the beetle, as no adult insect
emerged from the seeds treated with this concentration. The exact concentration
of the other oils affected the emergence percentage, yet they did not differ
significantly from the clove oil at the same concentration. The emergence
percentage obtained from cinnamon and lavender was 0.33% at the concentration
of 5%, while the emergence percentage of the control treatment was 15.30%.
Lavender oil at the concentration of 1% showed the lowest activity as the
emergence percentage was 13%, followed by the clove oil at 1%, resulting in an
emergence percentage of 10.33%. Comparing the oils according to the average
emergence percentage, it is remarkable that cinnamon oil came first with an
average emergence percentage that did not exceed 1.78%, followed by clove oil
at 4% on average and lavender oil at 5.56% on average.

Table
3.
Effect of cinnamon, lavender and clove plant oils on adult emergence of C. maculatus
Effect of cinnamon, lavender and clove plant
oils on the productivity of C. maculatus
Table 4
demonstrates that treating cowpea seeds with high concentrations of plant oils
( cinnamon, lavender and clove ) affected the productivity of C. maculatus.
The concentration of 5% of clove oil had the highest effect, compared to other
oils, leading to 0 productivity, followed by lavender and cinnamon oils at the
same concentration, producing 3.67% and 6.7%, respectively. The productivity of
the control treatment was 75%. The beetle reached the maximum productivity at
the concentration of 1% for clove, cinnamon and lavender, recording 110.2,
108.9, and 94.33 %, respectively, whereas treating the seeds with the
concentration of 3% reduced the productivity to 21.4%, 23.33, and 41.7% for
each oil treatment respectively. Comparing the effect of the oil of these
plants in terms of productivity average , it is noticeable that the lowest
impact on beetle productivity was recorded by lavender oil, reaching 40.4%,
followed by clove oil, producing 43.39%, and finally by cinnamon oil at 52.4%
on average.

Table
4.
Effect of cinnamon, lavender and clove plant oils on the productivity of C.
maculatus
Effect of cinnamon, lavender and
clove plant oils on adult killing of C. maculatus
Table 5 illustrates the effect of
cinnamon, lavender and clove on killing the adults of C. maculatus in the
facultative experiment. The clove oil at the concentration of 5% was the most
effective in killing the males and females of the insect. The mortality
percentage for the males and females was 3.00% and 7.00%, with a total average
of 3.33% and 4.00%, respectively, followed by cinnamon oil causing mortality of
1.00% and 1.33% for males and females, respectively. The lavender oil was
relatively the least effective as the mortality percentage was 0.33% and 1.00%
for the males and females respectively. The concentration of 1% in all oils was
the least effective. The oils effect increased at the concentration of 3%,
reaching the highest impact at 5%. It is also noted from the same table that
insect females were more affected by the oils than males.

Table
5.
Effect of cinnamon, lavender and clove plant oils on adult killing of C.
maculatus
Effect of cinnamon, lavender and clove plant oils on
egg laying of C. maculatus
Results in Table 6 refer to a significant
difference in the number of eggs. The minimum egg number was obtained from the
treatments with cinnamon and clove oils at 1%, resulting in 10.00 and 9.60
eggs, respectively, while the highest number was 13.00, resulting from the
lavender oil treatment. The clove oil at the concentration of 3% showed more
effectiveness than other oils as the number of eggs did not exceed 7.13 eggs,
followed by cinnamon oil and lavender oil, giving 9.20 and 10.60 eggs on
average, respectively. Regarding the 5 % concentration treatments, clove oil
came at the first rank, reducing the number of eggs to only 5.60 eggs, which
increased to 8.80 eggs due to treatment with lavender oil. The effect of clove
oil was moderate in decreasing the number of eggs to 6.73 on average.

Table
6.
Effect of cinnamon, lavender and clove plant oils on egg laying of C.
maculatus
Effect of cinnamon, lavender and
clove plant oils on adult emergence of C. maculatus
Table 7 shows significant
differences between the plant oils in their effect on the adult emergence of C.
maculatus. The cinnamon and clove oils were more effective than lavender oil as
the emergence percentage affected by the cinnamon and clove oils were 6.78% and
6.22%, respectively ( without a significant difference) . The emergence percentage
for lavender treatment was 8.11%. It is observed that the emergence percentage
at the concentration of 1% was high for all plant oils. The highest emergence
percentage level was recorded by clove oil treatment (18.67%), while the lowest
level ( 13.00% ) was obtained from the cinnamon oil treatment. The lavender oil
treatment at the concentration of 1% gave a 16.00% emergence percentage, and
the average emergence percentage at 1% was 15.11%. Concerning the concentration
of 3%, the differences between the oils were insignificant since the emergence
percentages affected by cinnamon, lavender and clove oils were 6.33%, 6.67 %,
and 6.67%, respectively. Also, no significant difference was observed for the
treatments of 5% concentration. The emergence percentages at this concentration
(5 %) for all oils were the lowest, not exceeding 1.00%.

Table
7.
Effect of cinnamon, lavender and clove plant oils on adult emergence of C.
maculatus
Effect of cinnamon, lavender and
clove plant oils on the productivity of C. maculatus
Results in Table 8 refer to significant differences in the effect of the
plant oils on the productivity of C. maculatus. It is observed that insect
productivity was high at the treatment of 1% for oils maximized in the
treatment of lavender oil, reaching 89%. In comparison, it was 85.7% and 84.3%
( with no significant difference ) for cinnamon and clove oils, respectively.
Insect productivity decreased at the 3 % concentration for all oils, reaching
58.5, 36.10 and 29.6 % for cinnamon, lavender, and clove oils, respectively.
For 5 % concentration, insect
productivity was at the minimum level for all oils, reaching 16.00, 21.90 and
5.20 % for cinnamon, lavender and clove oils, respectively. In comparison among
oils' effect on insect productivity average, the lowest productivity average (39.7%)
was recorded by the treatment of clove oil, followed by lavender oil, which led
to a production average of 49% and next by cinnamon oil with a productivity of
53.4% on average.

Table
8.
Effect of cinnamon, lavender and clove plant oils on the productivity of C.
maculatus
DISCUSSION
Using
insecticides to prevent infection is one of the main approaches to protecting
stored seeds against pests 24. Several studies are conducted to
evaluate the lethal and repel effects of wild plants and medicinal herbs
against insects infecting the stored productions 25. In this study,
the influence of the essential oils of some plants (cinnamon, lavender and
clove) on C. maculatus killing, egg laying, adult emergence, and
productivity was evaluated. Cinnamon oil showed the highest impact on killing
the insect males in an obligatory experiment, achieving a mortality percentage
of 13.33%. Cinnamon and clove oils showed the highest effect on female
mortality percentage, reaching 11.33%. This result is consistent with those
referred to by 26: cinnamon oil at 5µl killed 13% of C. maculatus.
21 reported that LC50 of cinnamon and clove oils tested against C.
maculatus was 0.88 and 0.73 5µml/l air, respectively. Lavender oil impact
was low in killing the insect females and equal to clove oil in killing the
males, where the mortality percentage was 9/33% for each. Ahn et al. (1998)
referred that the high volatility oils cause insect mortality through
fumigation and gaseous effects that may influence the nervous system of C.
maculatus adults. Studies state that wild aromatic and volatile medicinal
plants have essential chemicals inhibiting rice weevil and other insects 27.
Clove
oil affected egg laying by repelling the adult insects, relatively more than
the other two oils as the number of eggs did not exceed 2.06 egg, a result that
is consistent with the results reported by 21, in that clove oil
repelled C. maculatus, followed by cinnamon oil that affected the number
of egg to be 5.13 egg. Lavender oil was less affected than others, where eggs
reached 10.00. The insect adult emergence was reduced by cinnamon oil to 1.78%,
clove oil to 4.00%, and lavender oil to 5.56%. 21 reported that
clove oil decreased the adult emergence percentage of C. maculatus by
76.86%. Lavender oil reduced the productivity of C. maculatus to 40.4%,
while the productivity of clove oil treatments was 43.39%. Cinnamon oil
decreased the productivity of C. maculatus to 52.4%. The effect of the
oils on the emergence percentage may be due to reaching them inside the egg
through the opening of the hilum or the eggshell and thus leading to fetus
death or incomplete development, or that oil may limit or prevent the entry of
oxygen into the egg, as referred by 28. Cinnamon bark extract killed
C.chinensis by 100% two days after the treatment 29 observed
that cinnamon oil had the highest effect in reducing the total content of
carbohydrates, proteins and lipids of C. maculatus; then, it reduced the
whole protein in the insect. Lavender oil showed the lowest effect resulting in
mortality percentage of 0.33% and 1.00% for males and females, respectively,
unlike the results obtained by 29 that lavender oil at the
concentration of 2mg/cm2 caused 76% of adults of the rice weevil (Sitophilus
oryzae) 48 hours after the treatment.
In
comparison, the concentration of 0.75ml/cm2 repelled the insect by
78% 5 hours after the treatment. At the 6 mg/cm2 concentration, the mortality
percentage reached 100% after 12 and 48 of the treatment. Concerning the oil
effect on egg laying, cinnamon oil reduced the number of laid eggs to 5.60
eggs, followed by clove oil as the number of eggs reached 8.80. Regarding the effect
of oils on adult emergence, they converged in their effects; the emergence
percentages of adults were 6.22, 6.78
and 8.11% for clove, cinnamon and lavender oils, respectively. For the effect
of oils on insect productivity, clove oil had the highest impact on reducing
productivity that did not exceed 39.7%; the lavender oil came second, with
productivity reaching 49.2%, and finally, cinnamon oil got insect productivity
at 53.4%.
From
the results of the cinnamon, lavender and clove oils effect, we notice that oil
activity generally increases with increasing the concentration, which is in
agreement with results referred to by 30, in that the total content
of carbohydrates, proteins and lipids inside the larvae of the red flour
beetle, decreased as a result of treating with increasing volatile oil
concentration of blue giant hyssop (Agastache foeniculum) used for
treating 31 reported that plant oils' fumigation and contact effects
are related to exposure duration and concentration 32 mentioned that
the fumigation effect of the clove oil increases with increasing the oil concentration
or the period of maize weevil (Sitophilus zeamais) exposure to the oil.
A study recorded that the toxicity of plant oils is mainly affected by the
chemical composition, which usually depends on the plant origin, weather
conditions, used method, extraction period and the plant part used for
extraction. All of these explain why some oils used in the experiment have a
low efficiency or variation in effect against C. maculatus involving
killing the adults, reducing egg laid by adults, emergence percentage, or
productivity 33. 21 also referred that cinnamon and clove
oils are one of the promising approaches for controlling C. maculatus by
fumigation way.
CONCLUSION
It
can be concluded from this study results that these oils have an evident effect
in controlling the insect, so it can be listed among the essential measures of
controlling this insect in legume storage conditions dominant in Iraq.
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Received: May 15, 2023/ Accepted: June 10, 2023
/ Published: June 15, 2023
Citation: Abdullah,
M.A.; Hadeeti, S.E.; Thakir, B.M. Study the effect of essential oils of some
plants in protection from Cowpea beetle, Callosobruchus maculatus in the
laboratory. Revis Bionatura 2023;8 (2) 73. http://dx.doi.org/10.21931/RB/2023.08.02.73