By the last few days in May, some of the larvae will be large enough to cut small corn below the growing point (Table 1) and impact corn stands. Exceptions are significant mid-April captures in Martin County and late-April captures in Rock County (Figure 1, Table 1).īased on accumulated degree days, BCW eggs from these significant flights should be hatching soon. So far this spring, most trap captures have been low. A significant capture does not mean economic injury to corn fields is certain, nor do lesser captures indicate no risk, rather significant captures can help provide a start-date for degree-days to begin accumulating and provide an indication of when larvae will be large enough to begin feeding on a corn crop. Minnesota has been using a trap capture of 8 or more BCW moths over a 2-night period as a significant capture, one indication of increased risk of injury to corn from BCW larvae. Some counties have more than one trapĪnd snow-covered fields delayed trap deployment in Shading represents the maximum two-night captures for the 2023 black cutworm moth captures (April 7 to May 5). ![]() It was a good reminder that crops should be scouted as they emerge.Īs snow left the fields, a network of volunteers began monitoring pheromone traps to track the arrival of black cutworm (BCW) moths migrating into Minnesota from the south.įig. I received my first picture of 2023 emerging corn yesterday. The spring of 2023 has been unusual in how long fields remained snow-covered, but throughout much of Minnesota growers have recently made rapid planting progress.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |