Farmers have long known that different crops have different weed problems. For example, legumes are particularly good at preventing parasitic weeds from growing nearby, but they also bring their own challenges in the form of herbicide resistance and diseases like soybean rust. What isn’t as well-known is how using multiple crops on the same farm can help you get rid of your weed problems altogether! A recent study published in PLoS ONE has found that farms with high crop diversity had 60% less parasitic weed abundance than farms with low crop diversity. Crop diversity can reduce weed pressure A new study published in the Proceedings of the National Academy of Sciences offers a potential explanation for why crop diversity can reduce weed pressure. It turns out that when farmers grow two or more crops, they are able to avoid most parasites that are specialized on one type of plant. This is because a host plant and its parasite depend on each other for survival, so only host plants w...
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