Economic Threshold for Cotton Aphids(Aphis gossypii Glover) on Different Development Stages of Cotton in Henan Province

doi:10.3321/j.issn:1000-7091.1989.03.011

Abstract

Abstract: Studies were carried out in Henan province in 1980-1986 to determine the loss caused by aphids on yield of cotton. Six-seven grades of aphid number were established in field trials by using insecticide spray at different stages of cotton growth. The subsequent development of regression equation, the exact economic threshold for cotton aphid on cotton is given. The calculated economic thresholds were 30-50 aphids/plant for the stage before three-leaves stage of cotton, 80 aphids/plant for the 4-6 leaves stages and 200 aphids/plant(three leaves)more or less for maturity stage of cotton, respectively. Aphid number accumulation on developing stage of cotton showed negative linear relationships with the yield, and insecticides should be applied before population reached critical level of aphids at different growth stage of cotton.

Key words: Cotton aphid, Damage, Economic threshold

Gao Zongren, Luo Yinfan, Guo Liangren. Economic Threshold for Cotton Aphids(Aphis gossypii Glover) on Different Development Stages of Cotton in Henan Province[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1989, 4(3): 60-66. doi: 10.3321/j.issn:1000-7091.1989.03.011.

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