. Cooperative economic insect report. Insect pests Control United States Periodicals. - 35 - INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES QUEENSLAND FRUIT FLY (Dacus tryoni (Frogg.)) Economic Importance: This tephritid is a serious pest of pome and stone fruits and is apparently very destructive to some citrus varieties during peak population years. Outbreak of 1940-41 in New South Wales caused rejection of 5-25 percent of citrus at harvest. Reports indicate the need to use systematic control in fruit areas to avoid heavy losses. Some fruits, such as grapes and bananas escape injury except
. Cooperative economic insect report. Insect pests Control United States Periodicals. - 35 - INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES QUEENSLAND FRUIT FLY (Dacus tryoni (Frogg.)) Economic Importance: This tephritid is a serious pest of pome and stone fruits and is apparently very destructive to some citrus varieties during peak population years. Outbreak of 1940-41 in New South Wales caused rejection of 5-25 percent of citrus at harvest. Reports indicate the need to use systematic control in fruit areas to avoid heavy losses. Some fruits, such as grapes and bananas escape injury except during peak years. Dacus tryoni appears to be as destructive to fruit production in its Australian range as the oriental fruit fly in the coun- tries where it appears. Commercial stone fruit orchards have been abandoned in Queensland largely due to D. tryoni. Distribution: Australia: New South Wales, Queensland, South Australia, and Victoria. Hosts: Some of the hosts include: Papaya, sour orange, lemon, grapefruit, Mandarin orange, sweet orange, guava, cashew, cucumber, quince, persimmon, banana, loquat, fig, tomato, apple, mango, mulberry, apricot, peach, sour cherry, garden plum, nectarine, pear, grape and Rubus sp. The species has also been recorded on over 40 additional hosts. Life History and Habits: This insect passes the winter (June-October) in the adult stage. Female adults, after passing through a two-week preoviposition stage following emergence from the pupae, deposit eggs in groups, up seven eggs per group, in fruit punctures. As many as 40 larvae have been found in one peach. Under favorable conditions eggs hatch in 2-3 days and larvae are full grown in 5-7 days (average period 20 days). Pupae remain in the soil from a week in summer to a month or more in cooler weather. The total life cycle requires from 2-3 weeks in summer (February) to two months in autumn (May). Adult females live for lengthy periods and four or five overlapping generations develop annually. D
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