Observations on the Biology and Control of Tortricid Larvae on Strawberries

SUMMARY Observations made in England between 1965 and 1970 showed that larvae of Acleris comariana (Zell.), Clepsis spectrana (Treits.), Lozotaenia forsterana ( F.), Cnephasia interjectana (Haw.), Cacoecimorpha pronubana (Hübn.) and Argyroploce lacunana (Den. & Schiff.) occur on strawberry. Of the pesticides tested primarily against Acleris comariana , azinphos‐methyl, fenitrothion, malathion, methidathion, mevinphos, parathion and trichlorphon gave very good control of second generation larvae when applied at 200 gal/acre (2,245 l./ha). DDT and TDE gave relatively poor control. When applied against first generation larvae in the spring at 100 gal/acre (1,123 l./ha), azinphos‐methyl, fenitrothion, metkidathion and trichlorphon were less effective though the number of larvae was reduced by over 50 per cent. DDT, phosalone and phosmet also killed over 50 per cent of first generation larvae, but dichlorvos and Dupont 1642 did not; malathion gave variable results.