![]() ![]() This article has more on how to identify cutworm species, as well as more details on scouting and management. This could affect the ideal timing for control measures depending on the proportion of larvae that are not actively feeding, although residual activity of most registered products should allow for adequate control. Check for green material in the gut of larvae to determine if they are actively feeding, as they will cease feeding temporarily during molting between instars. Scout throughout the field to determine the distribution of larvae, as patch spraying is sometimes sufficient to control outbreaks. ![]() Repeat a few times throughout the field.Īction Threshold: A nominal threshold of 25-30% stand reduction has been suggested. Also look for pupae and frass (cutworm excrement) around roots as evidence. Larvae often curl up or attempt to hide in the debris when exposed. Loosen the soil and shake it up to activate cutworms. In these suspect areas, dig a one square foot area to a depth of 10 cm and put the soil into a basin. How: Check the edges of bare areas for cut-off plants. High moisture was thought to set back cutworms, but that is not always the case. ![]() Bare spots will begin to appear within the field, typically on south facing slopes and hilltops where the soils are warmer and soil texture is lighter. Where: Look for bare areas, holes and notches in foliage, and plants that are wilting, toppling over or completely cut off. When to scout: Inspect seedlings every 3 to 4 days during the first few weeks of crop development, and more often if cutworms have been reported in your area. Here are scouting techniques to follow while inspecting canola fields for cutworms. This could be due to various factors, including the long fall, early warm spring and weed growth to provide food through these times. Higher than normal cutworm feeding has been reported in some locations. ![]()
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