Abstract
The effects of intercropping wheat, Triticum aestivum L., with mung bean, Vigna radiate L., on the populations of English grain aphid, Sitobion avenae (F.) (Hemiptera: Aphididae), and its natural enemies were evaluated by field and laboratory experiments. The population densities of aphids and their natural enemies were evaluated in the intercropped field against different row ratio combinations of wheat-mung bean. Results showed that wheat-mung bean intercropping caused a drop in aphid densities, and the ratio 12 wheat: 4 mung bean brought about the largest drop (> 8%). In addition, the population densities of coccinellids (ladybirds) and parasitoids and the species diversity of all the natural enemies of aphid were higher in the intercropped field than in the field planted only with wheat. However, intercropping did not influence the community indices (evenness and index of dominance concentration) of the natural enemies. Y-tube olfactometer bioassays were carried out in the laboratory to test whether odor blends of host and nonhost plants affect the host selection of S. avenae. Bioassays indicated that both apterous and alate aphids significantly preferred host plant odor over odor blends of host and intercropped species. Hence, the olfactory-based host location of aphids in the field might be affected by intercropping. The intercropping experiment clearly showed that increased crop species diversity suppresses aphid population growth and preserves the population of natural enemies of aphids. Our results also provide support for the "resource concentration hypothesis" and the "enemies hypothesis".
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Claims 7
Claim · model-written summary
Wheat-mung bean intercropping caused a drop in aphid densities.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- wheat-mung bean intercroppinge0
- Interactor
- aphide0pest
- Outcome
- aphid densitiese0
- Direction
- drope0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat-mung bean intercropping caused a drop in aphid densities”
Claim · model-written summary
The row ratio of 12 wheat to 4 mung bean gave the largest drop in aphid density, more than 8%.
- Taxon
- wheatTriticum aestivume0
- Treatment
- 12 wheat: 4 mung beane0
- Outcome
- largest drope0
- Direction
- largest drope0
- Value
- > 8%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat-Mung Bean Intercropping”
e0“the ratio 12 wheat: 4 mung bean brought about the largest drop (> 8%)”
Claim · model-written summary
Population densities of coccinellids and parasitoids were higher in the wheat-mung bean intercropped field than in wheat alone.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- intercropped fielde0
- Interactor
- coccinellids (ladybirds)Coccinellidaee0biocontrol_agent
- Outcome
- population densities of coccinellids (ladybirds) and parasitoidse0
- Direction
- highere0
- Comparator
- field planted only with wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat-Mung Bean Intercropping”
e0“the population densities of coccinellids (ladybirds) and parasitoids and the species diversity of all the natural enemies of aphid were higher in the intercropped field than in the field planted only with wheat”
Claim · model-written summary
Species diversity of all natural enemies of aphid was higher in the intercropped field than in wheat alone.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- intercropped fielde0
- Outcome
- species diversity of all the natural enemies of aphide0
- Direction
- highere0
- Comparator
- field planted only with wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat-Mung Bean Intercropping”
e0“the population densities of coccinellids (ladybirds) and parasitoids and the species diversity of all the natural enemies of aphid were higher in the intercropped field than in the field planted only with wheat”
Claim · model-written summary
Intercropping did not influence the community indices (evenness, dominance concentration) of the natural enemies.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- intercroppinge0
- Outcome
- community indices (evenness and index of dominance concentration)e0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat-Mung Bean Intercropping”
e0“intercropping did not influence the community indices (evenness and index of dominance concentration) of the natural enemies”
Claim · model-written summary
In olfactometer bioassays, both apterous and alate aphids significantly preferred host plant odor over odor blends of host and intercropped species.
- Taxon
- aphidsAphidomorphae0
- Treatment
- host plant odore0
- Interactor
- aphidsAphidomorphae0pest
- Outcome
- preferrede0
- Direction
- preferrede0
- Comparator
- odor blends of host and intercropped speciese0
Verbatim
e0“both apterous and alate aphids significantly preferred host plant odor over odor blends of host and intercropped species”
Claim · model-written summary
The authors suggest that olfactory-based host location of aphids in the field might be affected by intercropping.
- Taxon
- aphidsAphidomorphae0
- Treatment
- intercroppinge0
- Outcome
- olfactory-based host locatione0
Verbatim
e0“the olfactory-based host location of aphids in the field might be affected by intercropping”
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intercropping · ecology: diversity · Triticum aestivum (wheat)Results agree
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See all 8 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.