How can I control wire worms in carrots. We have used used coffee grounds to work in the ground at planting and it helps some but they still appear. What type of pesticide can I use for this Problem?
Yamhill County Oregon
Hello and thanks for your question about wireworms. First here is a link to information on wireworms (you will have to scroll alphabetically to find the section) from the Pacific Northwest Insect Management Handbook -- http://uspest.org/pnw/insects . One of the most important things to do is to rotate your vegetables so the infestation does not continue year after year in the same crop. Wireworms also appear to be fond of potatoes, so avoid planting these in the same location for several years. Surprisingly, tomatoes do not appear to be strongly effective, so rotation with tomatoes may work for you. Including winter cover crops like alfalfa may also help reduce the population of wireworms. Other suggestions are to alternate periods of dryness and very high moisture, which tends to reduce the wireworm population. Planting "trap crops" such as wheat, which draw away the wireworms, may also provide some relief. Here is a link to a fact sheet from Rutgers Univesity which gives similar alternatives. Unfortunately, there are few if any chemical treatments available to homeowners, so these kind of "cultural controls" are the most effective. http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=1&ved=0CDIQFjAA&url=http%3A%2F%2F... Thans again, please ask if you have other questions or need clarificiation. Linda