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《Journal of Southwest Agricultural University》 1995-01
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Wei;Qingcai;Wu Shiyuan;Mao Yongbin;Wang Kaihong (Department of Plant Protection,Southwest Agricultural Univ)  
The effects of the population density of wheat aphids at different growth stages on wheat yield were investigated under controlled conditions with the density of the pest regulated. The destructive levels of aphids were found to vary at different' growht stages of the crop. The flowering stage appeared to be most susceptible, followed by the milk stage. When the number of aphids was lower than 2 per plant at elongation stage,the yield tended to increase,instead,owing to the compensation function. Only when the number of aphids was 51. 5 per plant or more,did wheat yield decrease significantly. The preventive indexes at different growth stages are recommended as follows; elongation stage-51. 5 per plant;heading stage-4. 41 per plant;seed-filling stage-7. 8 per plant. After the milk-ripe stage, the number of aphids will drop sharply and. therefore, no controlling measures are necessary.
【Fund】: 四川省科委“八五”攻关课题
【CateGory Index】: S435.122
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