Abstract
Plant products were evaluated under field conditions for their efficacy as insecticides against the cowpea beetle, Callosobruchus maculatus, on stored cowpea. Seeds, mixed with finely ground clay and three volatile oils were stored in air-tight jerry-cans and canisters. Pods were treated with leaf powders of two plant species and stored in traditional palm-leaf huts. Beetle damage was evaluated before and after storage. The treatments did not prevent damage, but after treatment with oils, fewer beans showed beetle emergence holes; also, the percentage of uninfested beans and the weight of one litre of beans were each higher than for untreated beans. The percentage of germination of stored beans was highest after treatment with Ocimum basilicum oil. Leaf powder of Momordica charantia was effective against weight loss of stored seeds, whereas Ficus exasperata caused a decrease in both the percentage of infested beans and the number of emerged beetles, and more parasitoids emerged than from untreated beans. Laboratory tests on the effect of the oils on the development of the beetle and on bean germination did not reveal effects of the oils. We compare data obtained from the laboratory and with those obtained in the field.
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Claims 8
Claim · model-written summary
Plant product treatments did not prevent stored cowpea damage.
- Taxon
- cowpea
Vigna unguiculatat0 - Treatment
- The treatmentse0
- Outcome
- damagee0
- Direction
- did not prevente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“The treatments did not prevent damage”
Claim · model-written summary
Oil treatment reduced the number of beans with beetle emergence holes.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- oilse0
- Interactor
- beetlee0pest
- Outcome
- beans showed beetle emergence holese0
- Direction
- fewere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“after treatment with oils, fewer beans showed beetle emergence holes”
Claim · model-written summary
Oil-treated stored cowpea had a higher percentage of uninfested beans and higher one-litre bean weight than untreated beans.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- percentage of uninfested beans and the weight of one litre of beanse0
- Direction
- highere0
- Comparator
- untreated beanse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“the percentage of uninfested beans and the weight of one litre of beans were each higher than for untreated beans”
Claim · model-written summary
Ocimum basilicum oil gave the highest germination percentage of stored cowpea.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- Ocimum basilicum oile0
- Outcome
- percentage of germination of stored beanse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“The percentage of germination of stored beans was highest after treatment with Ocimum basilicum oil”
Claim · model-written summary
Momordica charantia leaf powder reduced stored seed weight loss.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- Leaf powder of Momordica charantiae0
- Outcome
- weight loss of stored seedse0
- Direction
- effective againste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“Leaf powder of Momordica charantia was effective against weight loss of stored seeds”
Claim · model-written summary
Ficus exasperata leaf powder decreased infestation percentage and emerged beetles.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- Ficus exasperatae0
- Interactor
- beetlesColeopterae0pest
- Outcome
- percentage of infested beans and the number of emerged beetlese0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“Ficus exasperata caused a decrease in both the percentage of infested beans and the number of emerged beetles”
Claim · model-written summary
Ficus exasperata treatment yielded more parasitoid emergence than untreated beans.
- Taxon
- cowpeaVigna unguiculatat0
- Interactor
- parasitoidse0biocontrol_agent
- Outcome
- parasitoids emergede0
- Direction
- moree0
- Comparator
- untreated beanse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“more parasitoids emerged than from untreated beans”
Claim · model-written summary
Laboratory tests found no oil effect on beetle development or bean germination.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- oilse0
- Interactor
- beetlee0pest
- Outcome
- development of the beetle and on bean germinatione0
- Direction
- did not reveal effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“Laboratory tests on the effect of the oils on the development of the beetle and on bean germination did not reveal effects of the oils”
The same questions in other papers
botanical · quality: postharvest · Vigna unguiculata (cowpea)Positive and negative results
12 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- no effect
- no effect
12 papers more in this group
See all 16 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.