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利用田间自然虫源级别辅以人工控制培养,使形成虫量梯度,以研究油菜蚜虫混合种群对油菜植株生长及产量的影响。结果表明,在蚜量达500头/百株以上时,影响趋势明显加大,特别在5000～7000头/百株和7000头/百株以上时,株高、叶面积、分枝依次减少41.6％,50.4％和69.5％;71.3％,51.1％和76.3％;产量损失73.0％和96.3％。并建立了其影响的动态模型。通过对油菜产量构成因子的通径分析,明确了产量损失主要是由于蚜虫危害造成批荚率的提高。因此,在油菜生长后期防治虫害的同时,还应采取降低批荚率的农艺措施。
The natural insect level in the field was supplemented with artificial control training to make the gradient of the insect population to study the effects of the mixed population of rape aphids on the plant growth and yield. The results showed that when the amount of aphids was more than 500 per 100 plants, the impact tended to increase significantly, especially in the range of 5000-7000 heads per 100 plants and 7000 heads per 100 plants, the plant height, leaf area and branches decreased by 41.6 %, 50.4% and 69.5%; 71.3%, 51.1% and 76.3% respectively; yield losses of 73.0% and 96.3%. And established a dynamic model of its impact. Through the path analysis of rapeseed yield components, it is clear that the loss of yield is mainly due to the increase of the pod rate due to the aphid damage. Therefore, in the later stages of rapeseed pest control, should also be taken to reduce pod rate agronomic measures.