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Experiments at the University of Tennessee have revealed that grass mulch hay or dried grass clippings) between vegetable rows promotes an abundance of pest-controlling spiders. For best results, mulching needs to be done when crops are planted. In one Tennessee trial, insect damage to brussels sprouts,, cabbage, and potatoes was significantly less with grass mulch than with bare ground between rows. Removing spiders from mulched plots each week gave results similar to those with bare ground between rows, so It appears that spider predation is the important factor.
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