Abstract
The aphid Aphis gossypii Glover (Hemiptera: Aphididae), a harmful pest on cotton, causes direct damage, reducing plant vigor, and indirect damage by honeydew secretion and transmission of several viruses. Due to the problem of pesticide resistance, alternative techniques for chemical control, such as the use of natural insecticides, have been object of research. The effects of aqueous extracts of neem (Azadirachta indica A. Juss) seed powder on the development, survival and fecundity of A. gossypii were evaluated. Treatments consisted of neem seed powder in the concentrations of 23.8, 122.0, 410.0 and 1,410.0 mg/100 mL of distilled water. Mortality rate during the nymphal development for aphids maintained on cotton leaf discs treated with the two highest concentrations were, respectively, 60.0% and 100.0%. With the exception of the highest concentration (1,410.0 mg/100 mL), neem concentrations did not extend the aphids' development period. The net reproductive rate (R0) was of 35.0 nymphs/female for control aphids and of 0.0 nymph/female when the group of females was exposed to neem seed powder at 1,410.0 mg/100 mL since birth. The aqueous extract of neem seeds is efficient against the aphid A. gossypii, causing nymph mortality and reducing their survival period and fecundity.
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Claims 5
Claim · model-written summary
The two highest neem concentrations caused nymph mortality of 60.0% and 100.0% in aphids on cotton leaf discs.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- the two highest concentrationse1
- Interactor
- aphidsAphidomorphae1pest
- Outcome
- Mortality rate during the nymphal developmente1
- Direction
- increaseinferrede1
- Value
- 60.0% and 100.0%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a harmful pest on cotton”
e1“Mortality rate during the nymphal development for aphids maintained on cotton leaf discs treated with the two highest concentrations were, respectively, 60.0% and 100.0%”
Claim · model-written summary
Neem concentrations other than the highest did not extend the aphid development period.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- neem concentrationse2
- Interactor
- aphidsAphidomorphae2pest
- Outcome
- development periode2
- Direction
- did not extende2
- Qualifier
- With the exception of the highest concentration (1,410.0 mg/100 mL)e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a harmful pest on cotton”
e2“With the exception of the highest concentration (1,410.0 mg/100 mL), neem concentrations did not extend the aphids' development period”
Claim · model-written summary
Neem seed powder at 1,410.0 mg/100 mL reduced the net reproductive rate of aphids from 35.0 to 0.0 nymphs per female.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- neem seed powder at 1,410.0 mg/100 mLe3
- Interactor
- aphidsAphidomorphae3pest
- Outcome
- net reproductive rate (R0)e3
- Direction
- decreaseinferrede3
- Value
- 0.0 nymph/femalee3
- Comparator
- control aphidse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a harmful pest on cotton”
e3“The net reproductive rate (R0) was of 35.0 nymphs/female for control aphids and of 0.0 nymph/female when the group of females was exposed to neem seed powder at 1,410.0 mg/100 mL since birth”
Claim · model-written summary
Aqueous neem seed extract reduced the survival period and fecundity of Aphis gossypii.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- aqueous extract of neem seedse4
- Interactor
- A. gossypii
Aphis gossypiie4pest - Outcome
- survival period and fecunditye4
- Direction
- reducinge4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a harmful pest on cotton”
e4“The aqueous extract of neem seeds is efficient against the aphid A. gossypii, causing nymph mortality and reducing their survival period and fecundity”
Claim · model-written summary
Aqueous neem seed extract increased nymph mortality of Aphis gossypii.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- aqueous extract of neem seedse4
- Interactor
- A. gossypiiAphis gossypiie4pest
- Outcome
- nymph mortalitye4
- Direction
- increaseinferrede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a harmful pest on cotton”
e4“The aqueous extract of neem seeds is efficient against the aphid A. gossypii, causing nymph mortality and reducing their survival period and fecundity”
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Azadirachta indica · Aphidomorpha · Gossypium hirsutum (cotton)Results agree
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- positive
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5 papers in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
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See all 7 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.