THE ECONOMIC THRESHOLD AND TREATMENT FORECAST FOR THE CALIFORNIA RED SCALE (AONIDIELLA AURANTH MASK) IN CITRUS GROVES IN ISRAEL *

A Grunberg
1969 Journal of Entomology   unpublished
The ecological conditions prevailing in citrus groves in Israel restrict the California red scale population until midsummer. Climatic changes (mainly the cessation of dry desert winds) and a decisive drop in the activities of specific natural enemies in July and a marked increase in the use of insecticides applied from the air or ground at low or ultra low volumes (creating drift conditions), explain the predictable increase in summer. A definable correlation seems to exist between foliage and
more » ... between foliage and fruit injestation, once this correlation is known and the value of the economic threshold is established, forecast data on the necessity of chemical control can be supplied.
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