The mortality of artificially infested third instar larvae of Anastrepha lundens and A. obliqua in mango fruit with insecticidal controlled atmosphwees at high temperatures

摘要

Mango fruit in Mexico can be infested with several insects including various species of fruit flies. Hot water (46.1 deg C for 65-90 minutes, depending on fruit weight) is the only authorized quarantine treatment in the country. Some mango cultivarsare tolerant to insecticidal atmospheres and to heat. Previous work in our laboratory and also reported in this meeting indicated that insecticidal controlled atmospheres (0-0.5 KPa O_2 + 50 KPa CO_2) at high temperatures (44-45 deg C) are very effective in causing in vitro mortality of eggs and third instar larvae of Anastrepha ludens and A. obliqua. Therefore in this work mango fruits were artificially infested with the third instar larvae of both species and larval mortality was determined after thefruits were exposed to the same atmosphere at 35-49 deg C and 50% RH for 160 min. Temperatures at 35-40 deg C caused 100% mortality of larvae of A. obliqua, but not of A. ludens. Temperatures at 42 to 49 deg C caused 100% mortality of the third instar larvae of both species.