Abstract
The aphidAphis gossypii was previously known as a minor pest in cotton fields in Israel and it usually disappeared toward mid-season. At the end of 1983 and throughout the 1984 season an outbreak ofA. gossypii occurred in cotton fields. Aphids became the primary pest in 1984 and up to 80% of the pesticide treatments were directed against them in some cotton areas. The population returned to its normal level in 1985, but the aphids continued to appear throughout the season, rather than being an early season pest.
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