|There are lots of lygus bugs living in alfalfa fields right now.|
|Here is an example of a cotton square with lygus bug damage.|
Carlos reports some instances of squares falling off. It’s unclear if the drop is due to lygus bug damage or other stress. One thing is for certain, cotton growers have a near zero tolerance for the pest. UC IPM suggests treatment until mid-June at one bug per 50 sweeps of the sweep net and two bugs per 50 through the end of this month. Spraying, however, can be harmful to beneficial insects. That’s why cultural controls are preferred pest management strategy at the outset.
So here we come full circle to back to alfalfa fields and leaving a habitat for lygus and reducing the migration to cotton. Here are strip-cutting tips from UC IPM:
|A grower leaves a strip of uncut alfalfa near a field of cotton.|