Controlled-atmosphere effects on blueberry maggot and lowbush blueberry fruit.
Larvae of Rhagoletis mendax were reared in the laboratory on apple and treated for 48 h with various concn of CO2 and 2, 5 or 20% O2 at 5 or 21°C. CO2 concn of >45% at 21°C resulted in only 10% larval survival. Fumigation was more effective at 21 than at 5°C. Changing O2 concn had no effect. In another experiment, commercial shipments of fruits of Vaccinium angustifolium were placed in a fibreglass tank and fumigated with 54% CO2 at 21°C. After 48 h, 9% of larvae of R. mendax survived in CO2, while 68% survived in air. Fumigation with 54% CO2 for up to 48 h did not adversely affect the quality of the berries (as measured by marketable berries, berry weight, split berries, shrivelled berries, epicuticular wax, firmness, soluble solids and titratable acid concn, off-flavours or skin browning).