INSECTICIDES FOR CONTROL OF LIGHT BROWN APPLE MOTH AND CODLING MOTH IN AUSTRALIA

Spray treatments of chlorpyrifos, chlorpyrifos-methyl, leptophos, mexacarbate, Bacillus thuringiensis and standard recommendations for control of Epiphyas postvittana Walk. and Cydia pomonella (L.), were compared in 6 field experiments on apples in Victoria and Tasmania in 1971/72 and 1973/74 and in New South Wales [NSW] in 1971/72. In all 4 experiments in southern Victoria and Tasmania, chlorpyrifos 250 ppm applied at 2 wk intervals from calyx formation was as effective against E. postvittana as the standard azinphos-methyl. In the same region chlorpyrifos-methyl 500 ppm gave results as good as the standard in 2 experiments and mexacarbate 500 ppm and Bacillus thuringiensis 37.5 g 100 l-1 in one. Alternate sprays of B. thuringiensis 25 g 100 l-1 and either chlorpyrifos 375 ppm or leptophos 375 ppm or leptophos 375 gave results as good as the standard in 2 experiments. Azinphos-methyl 375 ppm sprays alternated with B. thuringiensis 25 g 100 l-1 gave results as good as the standard in a single experiment. In 1 experiment, leptophos 500 ppm gave better control than the standard. In 2 experiments in central and southern Victoria, chlorpyrifos 250 ppm applied every 2 wk from calyx formation was as effective against C. pomonella as the standard azinphos-methyl treatment. Leptophos 500 ppm used at 4- and 2-wk intervals in central and southern Victoria, respectively, gave results equal to the standard which were also equalled by chlorpyrifos 250 ppm and 375 ppm, respectively, applied every 2 wk. In an experiment in NSW with spray applications at 4-wk intervals from calyx formation, chlorpyrifos 500 ppm was not as effective against C. pomonella as the standard azinphos-methyl treatment. Chlorpyrifos-methyl 500 ppm and mexacarbate 500 ppm did not reduce damage below the untreated. Leptophos 500 ppm was as effective as the standard.