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该文以杨树和杨树主要害虫为对象,为准确地进行发生期预报,研究其物候与发生的关系。研究结果表明,杨毒蛾幼虫活动始期5月2日,正与青杨展叶相吻合,幼虫活动盛期5月8日,与紫丁香始花相吻合,杨干象的幼虫活动始期4月23日,与健杨出絮相吻合,幼虫活动盛期5月4日,与杏花始盛期相吻合,柳蛎盾蚧若虫活动始期5月28日,与粉蔷薇始花相吻合,若虫活动盛期6月15日,与粉蔷薇盛花相吻合。利用指示植物预报发生期进行防治,使杀虫率由70%提高到95%。虫口密度由每株281头下降到14.05头。总结编制氵凡河镇春季自然历,并提出当地的防治杨树主要害虫的报警植物和指示植物。
In this paper, poplar and poplar main pests as the object, in order to accurately predict the occurrence period, study the relationship between its phenology and occurrence. The results showed that the activity of the larvae of the larva was on May 2, coinciding with the development of the lanceolata. The larval activity peaked on May 8, coinciding with the flowering of lilac, and the larvae of the larvae of Yang Qian were active on April 23, Yang out flocculent coincide, the larvae peak activity on May 4, coincided with the beginning of the apricot blossom, Nyctica scabyphytis nymph activity on May 28, and pink rose flower coincide, nymph activity peaked in June On the 15th, coincided with the pink rose flowers. The use of indications of plant occurrence and control of the period, the insecticidal rate increased from 70% to 95%. Insect population density decreased from 281 to 14.05 per plant. Summarize the spring natural calendar of 氵 Van River town and put forward the local alarm plants and indicator plants against poplar main pests.