Integrated Control of Codling Moth 1 on Pears in California–Effects of Varying Dosage of Azinphosmethyl and Oil with Individual Cover Sprays

Abstract

Applications for control of codling moth, Laspeyresia pomonella (L.) on Bartlett pears were timed in relation to moth catches in sex pheromone traps and were varied with individual cover sprays in an effort to obtain maximum control of codling moth while retaining the benefits of reduced dosages. Azinphosmethyl was applied at 2 dosages (4 oz and 2 oz AI/100 gal) both alone and in combination with Volck Supreme® oil (1 gal/100 gal). Only slight differences in efficacy against codling moth were detected between the 2 dosages. Addition of oil to azinphosmethyl reduced its efficacy against codling moth, particularly when a low dosage was used in 3 cover sprays. The high dosage of azinphosmethyl tended to be more disruptive to the natural balance of twospotted spider mite, Tetranychus urticae Koch, than the lower one, and addition of oil was of benefit, at least where high dosages were used. Both dosages were disruptive to the natural balance of pear rust mite, Epitrimeris pyri (Nalepa). Oil offset this disruption but resulted in only partial control. Little or no differences in control of pear psylla, Psylla pyricola Foerster were observed between the 2 dosages of azinphosmethyl. Addition of oil aided in the control of P. pyricola . Where low dosage plus oil was used in the 2nd and 3rd applications, better control of codling moth was provided by a high dosage rather than a low dosage in the 1st application.