The following table is a summary of the registered products included in an alfalfa weevil insecticide efficacy test that was conducted during the 1994 growing season in Broadwater County. These result will provide you some guidance on how the included products preformed under Montana conditions. For further information contact Sue Blodgett. Other products tested are not registered for use on alfalfa. It appears that while spring weather conditions have caused us some problems in getting spring seeded crops in, we have had a benefit, too, in reducing grasshoppers.
Reports are that the cool, wet weather has killed the small, newly hatched grasshopper nymphs.
We have a report of adult weevil damaging spring wheat near Manhattan. The weevil has been identified as Listronotus montanus. The adult was observed feeding on grain left on the soil surface and also feeding on one and two leaf stage wheat, weakening plants and reducing plant stand. The adult appears to be nocturnal. During the day it is not evident, but is in soil cracks and in groups of three to 10 under dirt clods.