Postharvest management of New Zealand flower thrips (Thrips obscuratus) on apricots using ethyl formate or pyrethrum-based treatments

摘要

New Zealand flower thrips (NZFT, Thrips obscuratus (Crawford)) were exposed to a range of ethyl formate (EF) and pyrethrum-based postharvest treatments on apricots. Research showed that EF+C02 or EF+N2were effective treatments against NZFT and causednegligible damage to apricot fruit quality. However, pyrethrum dipping did not effectively control NZFT and caused significant internal damage to apricot fruit. Lethal concentration (LC99) estimates were developed for adult and larval NZFT using a rangeof EF concentrations (0-1.27% EF+C02) and temperatures (5, 15 and 25°C). It is estimated that treatments of 1% (30.7 g/m3) EF at 5 or 25°C or a higher concentration of 1.5% (46.3 g/m3) at 15°C will achieve 99% mortality of NZFT adults and larvae on apricot fruit with 95% confidence.