Summary
This study reveals that certain non-pathogenic soil bacteria can paradoxically weaken aphid suppression despite their known plant-growth-promoting properties. The researchers found that specific bacterial taxa correlated with increased aphid performance both directly and indirectly by reducing parasitoid-mediated top-down control. Against a complex background of varying soil fertility, microbial diversity and natural enemy communities, the effects of soil microbes on aphid growth exceeded those of nutritional factors alone, suggesting that soil microbial associates must be considered when predicting plant defence strength along nutrient gradients.
UK applicability
These findings have relevance to UK integrated pest management strategies and soil health initiatives, particularly where soil amendments or microbial inoculants are promoted to enhance plant nutrition and defence. The results suggest caution is warranted when introducing plant-growth-promoting bacteria without considering potential indirect effects on pest suppression dynamics.
Key measures
Aphid growth rates, parasitism by parasitoids, plant nutritional status, soil microbial composition, presence of competing herbivores, plant anti-herbivore defences
Outcomes reported
The study examined how non-pathogenic soil bacteria influence aphid population growth and the effectiveness of natural enemies (parasitoids) and competing herbivores in suppressing aphids. The research measured aphid performance, parasitism rates, and plant defence deployment across varying soil fertility, microbial biodiversity and natural enemy presence.
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