Integrated Control of Codling Moth 1 on Pears in California: A Practical Consideration Where Moth Activity is Under Surveillance 2

Abstract

Live female sex pheromone traps were used in 1969 to monitor the seasonal activity of Laspeyresia pomonella (L.) in field tests on pears at San Jose, Calif. Treatments for control of codling moth were timed according to these trap catches. The experiment sought to determine whether timing of applications in this way might allow the use of applications of less than standard efficacy against codling moth and whether such applications might be better suited to an integrated control program. Codling moth population pressure was very high and infestation of fruit at harvest was inversely related to dosage of azinphosmethyl. However, promising degrees of control were provided by a rate of azinphosmethyl as low as 1 oz active ingredient per 100 gallons. Addition of Volck Supreme® oil to azinphosmethyl or Gardona® (2-chloro-1-(2,4,5-trichlorophenyl) vinyl dimethyl phosphate) reduced efficacy against codling moth but increased the degree of control of pear psylla, Psylla pyricola Foerster, and phytophagous mites. There were no apparent differences in control of pear psylla between 3 rates of azinphosmethyl tested. A distinct advantage in the use of the lowest dosage of azinphosmethyl was less severe buildup in populations of the European red mite, Panonychus ulmi (Koch), and the twospotted spider mite, Tetranychus urticae Koch. Fundal SP® ( N′ - (4-chloro- o -tolyl)- N,N -dimethylformamidine hydrochloride), was not very effective against codling moth under the population levels encountered. It was, however, about as active as the oil combinations for control of pear psylla and mites.