Abstract
SUMMARYCodling moth granulosis virus (Cp GV) was produced in larvae of Cydia pomonella reared on artificial diet. The average yield of virus (9 × 109capsules/larva) was increased by raising the larvae on diet containing methoprene, a juvenile hormone analogue.In field trials in 1978 and 1979, one or two high‐volume applications of Cp GV at 7 × 1010 capsules/litre achieved reductions in numbers of mature larvae and damaged fruit that were little different from those obtained by two applications of azinphos‐methyl. A field trial in 1980 showed that at concentrations of Cp GV ≥ 6 × 108 capsules/litre, damaged diminished slowly with increasing virus concentration. Following virus application in 1980, Cp GV infectivity was reduced by half in 3 days, but some activity persisted at least 4–8 wk after spraying. The results indicate that codling moth GV is an effective control agent particularly in reducing numbers of larvae and the more severe forms of fruit damage.
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