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采用人工控制虫口密度,研究小麦生育期蚜虫密度对小麦产量的影响。结果表明,麦蚜在小麦不同生育期的危害不同,开花期为害最大,灌浆期次之。在拔节期,当害虫密度低于2头/株时,由于植株的超补偿作用,产量可相对增加,只有当累积蚜量达到51.5虫·d/株时,才会造成明显的产量损失。小麦不同时期的防治指标:拔节期51.5头·d/株,抽穗扬花期4.4头/穗,灌浆期7.8头/穗。乳熟期后,麦蚜数量急剧下降,不再造成危害,可不必防治。
Artificial population density control was used to study the effects of aphid density on wheat yield during wheat growth. The results showed that the harm of wheat aphid in different growth stages of wheat was different, and the damage was most serious in the flowering stage and followed by the filling stage. At the jointing stage, when the density of pests was lower than 2 per plant, the yield could be relatively increased due to the overcompensation effect of the plants, and the apparent yield loss would only be caused when the accumulated aphid population reached 51.5 insect · d / plant. The control indexes of wheat in different periods were: 51.5 d · d / plant at jointing stage, 4.4 heads / ear at heading and flowering stage and 7.8 heads / ear at grain filling stage. Milky maturity, the sharp decline in the number of wheat aphids, no longer cause harm, you do not have to control.