Pecan Nut Casebearer Forecast

 

Pecan Nut Casebearer Forecast System

Management of pecan nut casebearer

Often a single carefully timed insecticide application provides adequate control for first-generation casebearer.  Time insecticide applications accurately to control newly hatched casebearer larvae before they enter the nuts. Once inside nuts, larvae are protected from insecticides.

To determine whether treatment is needed and when to apply insecticide, examine nuts carefully in spring for casebearer eggs. Apply insecticides within 2 to 3 days after the first eggs hatch. At this time, the first larvae begin entering nuts. Infested clusters can be flagged to monitor egg hatch.

Delaying treatment until the first nut entry occurs maximizes the insecticide’s residual activity. However, consider the time required to treat the orchard and possible weather delays so that insecticide is applied before significant nut entry occurs. A second insecticide application may be required if unhatched eggs are found after the residual period of the insecticide has passed. Suggested insecticides to control pecan nut casebearer are listed in the Table.