|What will kill rootknot nematodes in my vegetable garden?
|Unfortunately, there is no one pesticide treatment that you can use to rid your garden of these troublesome pests. The best you can do is use a variety of strategies to hep keep their population down. One of the best things you can do is to incorporate lots of organic material into the soil. This will encourage populations of beneficial soil organisms that will either feed on or compete with the root knot nematodes. There is a product called Clandosan that is made from ground up shrimp and crab shells that is registered for use against root-knot nematodes. It works basically the same way as organic material in the soil. You work it into the top 6' of the soil and it promotes the growth of soil organism that then feed on the nematodes. You might consider solarizing your garden for a season to kill off nematodes. Cover the soil with clear plastic and let it bake for a month or two in the heat of the summer sun. The cover crop Elbon (cereal)rye is effective as a trap plant. The nematodes enter its roots and can't complete their life cycle. Plus the rye adds organic matter to the soil when you turn in under. Another possibility is to add commercially purchased beneficial nematodes (Steiner-nema-feltiae) to the soil.|