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Frequent mowing puts poisonous weed into survival mode

A study has found that frequent mowing of Solanum elaeagnifolium, also known as silverleaf nightshade, may help create a superweed. A professor of entomology and plant pathology has been studying silverleaf nightshade for more than a decade. New findings have shown that the more silverleaf nightshade was mowed, the more it developed ways to avoid destruction. The taproot went down further, nearly 5 feet deep, in the first generation of mowed plants. More spikes popped out on the stem as a defense against caterpillars feeding on the flowers. The flowers became more toxic to caterpillars, leading to less pressure from natural predators. ....

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