An experimental report on the control of Carposina niponensis Walsingham on apple by ground treatment with phoxim in microcapsule formulation.
Three formulations of phoxim were tested in apple orchards in Ningxia, China, for controlling summer pupae of Carposina niponensis and overwintered larvae as they became active in the spring. The dosage rate of a 25% microcapsule formulation used was 1.125-1.875 kg a.i./ha, that of a 50% emulsifiable concentrate was 3.0-3.75 kg a.i./ha and that of a 5% granule was 3.75-6.0 kg a.i./ha. The effects of the treatments persisted for 60 days after application. Less than 5% of fruits were damaged in treated plots. More than 85 ha of apple orchards were treated satisfactorily with the microcapsule formulation in 1982 and 1983.