【作者】 张建明； 张夕林； 蒋学辉；

【Author】 Jian-ming Zhang Xi-lin Zhang Xue-hui Jiang (Plant Protection Station of Nantong County,Jiangsu 226300)

【机构】 江苏省南通县植保站；

【摘要】 本文就小麦扬花后穗蚜对麦粒灌浆的影响及危害损失进行了定量研究,结果表明:在同一时期,单穗蚜量越多,小麦千粒重越低:随扬花后天数增加,小麦自身对蚜虫危害的耐受能力增强,单位虫量所致损失也愈小;灌浆盛期是小麦产量形成的关键时期,也是蚜虫种群快速增殖,吸食危害最剧烈的时期和化学防治的关键时期.据此组建了小麦扬花后不同时期麦蚜动态防治指标模型:X=1.9564ezp（0.1817t）/InC·（21.8245+0.1107t）-In100.C₁更多还原

【Abstract】 In this paper,the effect of ear-aphids（wheat aphids complex） on the milking of wheat seed and the grain losses caused by the aphids studied.The results showed that the bigger of the aphids number every ear was,the lower of the dried seed weight was.As the time went by after flowering,the ability of plant tolerance to the aphids damage increased.The results also indicated that the peak of milking stage was the most important period of the grain yield building,the key period of the aphids population increasing,the sensitive period of wheat plant to injury,and the proper time for chemical control.A dynamic action threshold model for ear-aphids in different periods after flowering was given as follows: X=1.9564EXP（0.1817t）/In C·N（21.8245+0.1107t）-ln100·C₁更多还原