Hoe 522 ( CME 134 ) , a New Insect Growth Regulator for Control of the Diamondback Moth

A new insect growth regulator, Hoe 522 (CME-134), was tested in the field in the northern Philippines for the control of diamondback moth, Plutella xylostella L which had developed resistance to a large number of insecticides. Hoe 522 was found to be highly effective against diamondback moth populations at all rates from 15 to 105 g Al/ha and performed significantly better than reference products. A flat dose response relationship was recorded in this dosage range. Weekly and ten-day interval sprays gave better control than a spray schedule of 14 days. Under these conditions and high insect infestation levels, rates of 30-45 g AI proved to be more effective than lower dosages. A positive correlation was found between insect control and yield. Application of Hoe-522 resulted in significant yield increase and superior crop quality. Crop tolerance to Hoe 522 was excellent.