Pecan growers in Parker County, as well as homeowners with backyard trees, should be aware that it is the time of year that pecan nut casebearers can cause damage to your pecan crop. It appears that the casebearer infestation will be light to average and the pecan crop appears to be above average. However this pest can significantly damage a pecan crop if not controlled, according to Jon Green, County Extension Agent-Agriculture with the Texas AgriLife Extension Service.
Based on Extension Entomologists’ predictions and current Parker County trap findings, control of 1st generation pecan nut casebearers should be applied to pecan trees May 19-22, if control is necessary, Green added. To determine if control is necessary check pecan clusters for eggs and nut entries on a daily basis.
Eggs are usually found on the tips of nutlets and about the size of the ball in a ball point pen. The eggs are white when first laid, then turn pink to red over a three-to-five day period before hatching.
Apply an insecticide the third day after the first eggs hatch to kill the larvae before they enter the nutlets. Since the larvae will hatch over a week-long period or more, a second spraying may be necessary, says County Extension Agent Jon Green.