Abstract
BACKGROUND: The cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae) is an important pest of cotton and horticultural crops globally. In China, smallholder farmers regularly intercrop cotton with garlic or onion. Aside from higher farm-level revenue, cotton intercrops are typified by lower Aphis gossypii abundance than monocrops. So far, the mechanistic basis of this lowered pest pressure has not been empirically assessed. RESULTS: Field trials showed that Aphis gossypii abundance is lower and (relative) abundance of aphid predators higher in early-season cotton intercrops than in monocrops. Cage trials and Y-tube olfactometer tests further indicated that garlic and onion volatiles repel Aphis gossypii alates. Electrophysiological bioassays and gas chromatography-mass spectrometry (GC-MS) identified two physiologically active volatiles, that is, diallyl disulfide and propyl disulfide from garlic and onion respectively. Next, behavioral tests confirmed that both sulfur compounds exert a repellent effect on alate Aphis gossypii. CONCLUSION: Garlic and onion volatiles interfere with Aphis gossypii settling, but do not affect its main (ladybird) predators. Meanwhile, early-season cotton/onion intercrops bear higher numbers of Aphis gossypii predators and fewer aphids. By thus unveiling the ecological underpinnings of aphid biological control in diversified cropping systems, our work advances non-chemical management of a globally-important crop pest. © 2023 Society of Chemical Industry.
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Claims 8
Claim · model-written summary
Aphid abundance was lower in early cotton intercrops than monocrops.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- intercropse0
- Interactor
- Aphis gossypii
Aphis gossypiie0pest - Outcome
- Aphis gossypii abundancee0
- Direction
- lowere0
- Comparator
- monocropse0
- Setting
- Field trialse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field trials showed that Aphis gossypii abundance is lower and (relative) abundance of aphid predators higher in early-season cotton intercrops than in monocrops.”
Claim · model-written summary
Relative aphid predator abundance was higher in early cotton intercrops.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- intercropse0
- Interactor
- aphid predatorse0biocontrol_agent
- Outcome
- (relative) abundance of aphid predatorse0
- Direction
- highere0
- Comparator
- monocropse0
- Setting
- Field trialse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field trials showed that Aphis gossypii abundance is lower and (relative) abundance of aphid predators higher in early-season cotton intercrops than in monocrops.”
Claim · model-written summary
Garlic volatiles repelled A. gossypii alates.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- garlice0
- Interactor
- Aphis gossypiiAphis gossypiie0pest
- Outcome
- Aphis gossypii alatese0
- Direction
- repele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cage trials and Y-tube olfactometer tests further indicated that garlic and onion volatiles repel Aphis gossypii alates.”
t0“cotton”
Claim · model-written summary
Onion volatiles repelled A. gossypii alates.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- onion volatilese0
- Interactor
- Aphis gossypiiAphis gossypiie0pest
- Outcome
- Aphis gossypii alatese0
- Direction
- repele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cage trials and Y-tube olfactometer tests further indicated that garlic and onion volatiles repel Aphis gossypii alates.”
t0“cotton”
Claim · model-written summary
Diallyl disulfide was identified as a physiologically active garlic volatile.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- diallyl disulfidee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Electrophysiological bioassays and gas chromatography-mass spectrometry (GC-MS) identified two physiologically active volatiles, that is, diallyl disulfide and propyl disulfide from garlic and onion respectively.”
t0“cotton”
Claim · model-written summary
Propyl disulfide was identified as a physiologically active onion volatile.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- propyl disulfidee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Electrophysiological bioassays and gas chromatography-mass spectrometry (GC-MS) identified two physiologically active volatiles, that is, diallyl disulfide and propyl disulfide from garlic and onion respectively.”
t0“cotton”
Claim · model-written summary
Diallyl disulfide repelled alate aphids.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- sulfur compoundse0
- Interactor
- Aphis gossypiiAphis gossypiie0pest
- Outcome
- alate Aphis gossypiie0
- Direction
- repellente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Next, behavioral tests confirmed that both sulfur compounds exert a repellent effect on alate Aphis gossypii.”
t0“cotton”
Claim · model-written summary
Garlic and onion volatiles did not affect ladybird predators.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Garlic and onion volatilese0
- Interactor
- ladybirde0biocontrol_agent
- Outcome
- main (ladybird) predatorse0
- Direction
- do not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Garlic and onion volatiles interfere with Aphis gossypii settling, but do not affect its main (ladybird) predators.”
t0“cotton”
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