The western bean cutworm (WBC) trapping season continues, and after a slow start, moth flights have rapidly increased in many northern Indiana county traps this past week.
Christian Krupke
heromone trapping began for western bean cutworm moths this past week.
Currently, rootworm larvae are hatching throughout the state. If larvae are successful in finding vulnerable corn roots, they will feed until pupation. In a matter of days, the beetles will begin emerging, then feed (e.g., mostly on corn and other pollen), and mate.
Whether you are a large apiarist or a beginning hobbyist, it is essential to understand and prepare your bees when a state/local agency announces any pesticide application program.
In some parts of the state, delayed planting – or re-planting – of corn is a reality. Some producers may be attempting to switch to shorter day hybrids, including some without desired insect traits, including rootworm-specific Bt traits.
As we discussed here last week, there have been an unprecedented number of calls and samples regarding seedcorn maggot damage, particularly in soybeans.
Multiple samples of seedcorn maggot damaged soybean seedlings have been submitted to the Purdue Plant and Pest Diagnostic Lab.
It seems that the freezing temperatures, and snow, of just over a week ago has spurred an increase in the black cutworm and armyworm moth activity, see the accompanying pheromone trap captures.
Recent reports from pest managers in northern counties have indicated that weevil damage and larval numbers are very high, well in advanced for this date, see accompanying map below.
Sampling an alfalfa field to determine the extent of alfalfa weevil damage and average stage of weevil development is best accomplished by walking through the field in an “M-shaped pattern.”
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