Based on degree day monitoring, it will be time to apply the first trunk spray for this pest in about five days.
Irrigate just before you spray. That way you will get at least five days of effect before you have to irrigate again.
Control the vegetation around the trunks of the trees so that it does not interfere with coverage.
Gun sprays have consistently been the most effective. Apply enough spray so that some will run into the cracks and crevices where the larvae are. Volume and patience are needed to get the best effect.
Spinosad -the active ingredient in Entrust, Success and Delegate - is effective against this pest. The rate for an Entrust gun spray is 75 grams of product/ha in up to 1,500 litres of water/ha.
A minimum of two sprays should be applied. After this one at the end of this week, do a second one in about 10 days. A third one the first week in August is recommended if your numbers are high.