. Cooperative economic insect report. Beneficial insects; Insect pests. 1029 - INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES APPLE THRIPS* (Thrips imaginis Bagnall) Economic Importance: Outbreaks of this species, which is indigenous to Australia, cause extensive damage to pears, apples and other fruits during some years. Sometimes attacks by T. imaginis will completely destroy the setting of young fruits. The attack was so severe in Victoria during 1926 that all fruit crops, including strawberries and cane fruits, were a complete loss. T. imaginis is chiefly a pest in the spring and early su
. Cooperative economic insect report. Beneficial insects; Insect pests. 1029 - INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES APPLE THRIPS* (Thrips imaginis Bagnall) Economic Importance: Outbreaks of this species, which is indigenous to Australia, cause extensive damage to pears, apples and other fruits during some years. Sometimes attacks by T. imaginis will completely destroy the setting of young fruits. The attack was so severe in Victoria during 1926 that all fruit crops, including strawberries and cane fruits, were a complete loss. T. imaginis is chiefly a pest in the spring and early summer, but severe outbreaks may occur in the autumn. As many as 2,800 per rose blossom have been found in Sydney during October. Damaging populations depend largely on meteorological conditions. If weather is unfavorable during October and November, thrips will not be serious even if large numbers survive the previous winter. A warm, wet, autumn favors a buildup, and often immense swarms will appear when these conditions are encountered. The species does not appear in damaging numbers in Tasmania. Distribution: Occurs throughout southern Australia and General Distribution of Thrips imaginis Hosts: Attacks the flowers of many plants; most serious on deciduous fruits though occasionally it becomes serious on other crops such as tomatoes and strawberries. Life History and Habits: The adults may be found throughout the year in South Australia, but populations fluctuate according to climatic conditions. Egg laying occurs through the female's life span, the average number varying from 186 to 251. Eggs are laid in the tissues of the flowers, including the stamens and pistils, and occasionally on young tender leaves of host plants. Newly hatched nymphs feed on epidermal cells causing a "browning" of the petals and destruction of the stamens and pistils. During an infestation year, 150 individuals may be present in each blossom. After passing through the second nyrap
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Keywords: ., bookcentury1900, booksubjectbeneficialinsects, booksubjectinsect
