Topic: Environment
Researchers at Penn State found that different cover crops can affect how plants defend themselves against pests. They discovered that some cover crops attract insects that eat harmful caterpillars, while others may weaken a plant's natural defenses.
A new study led by researchers at Penn State's College of Agricultural Sciences has made an important discovery about cover crops and pest control. Cover crops are plants grown between growing seasons to help protect and enrich the soil.
The team analyzed the effects of different cover crops on how plants defend themselves against pests. They found that plants grown in soil previously used by pea cover crops emitted more of a chemical called indole, which helps neighboring plants defend themselves against insects. However, these plants also had lower levels of benzoxazinoid, a natural toxin that can act as a pesticide.
The researchers also discovered that predator insects preferred to eat caterpillars from corn grown in soil previously occupied by pea cover crops. This is an important finding for farmers who use techniques they're already familiar with. The study's lead author, Jared Ali, said the findings offer practical solutions for growers using cover crops.
Ali explained that as humans domesticated plants and bred them to grow faster, produce more, and taste better, we also unintentionally weakened some of their natural defenses. He compared it to the domestication of wolves into dogs: when we selected for certain traits, we also bred out some of the protective features that served a purpose.
The study is part of Ali's broader work examining how plants defend themselves against pests. He and his team are looking for ways to use plants' natural defenses to protect crops from disease and pests.
Why It Matters
This discovery can help Indian farmers find new and effective ways to control pests without relying on pesticides, which can harm the environment and human health.
Key Facts
- Researchers at Penn State found that different cover crops can affect how plants defend themselves against pests.
- Some cover crops attract insects that eat harmful caterpillars.
- Plants grown in soil previously used by pea cover crops had lower levels of benzoxazinoid, a natural toxin that can act as a pesticide.
- Predator insects preferred to eat caterpillars from corn grown in soil previously occupied by pea cover crops.
- The study's lead author is Jared Ali, an associate professor of entomology at Penn State.
Key Terms
- Cover crop
- A plant grown between growing seasons to help protect and enrich the soil
- Indole
- A chemical that helps neighboring plants defend themselves against insects
- Benzoxazinoid
- A natural toxin that can act as a pesticide, antifungal, or feeding deterrent
Implications
This discovery can help Indian farmers find new and effective ways to control pests without relying on pesticides, which can harm the environment and human health.
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