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为探讨吡虫啉对绿盲蝽种群数量的控制作用,2011—2012年连续两年采用种子包衣、颗粒剂穴施和灌根处理棉花,并结合种植绿豆诱集带的方式,研究其对棉田绿盲蝽种群动态的影响。在吡虫啉有效成分用量为1 500g/hm~2时,棉花颗粒剂穴施+绿豆诱集带颗粒剂穴施、灌根和颗粒剂穴施3种处理,对棉田绿盲蝽种群数量控制作用较好,自棉花苗期至8月中旬花铃期百株绿盲蝽数量分别为12、15、17、8、19头,均低于为害经济阈值,控制有效期接近110 d;在吡虫啉有效成分用量为900g/hm~2时的棉花颗粒剂穴施、灌根处理以及吡虫啉有效成分用量为675g/hm~2的棉花种子包衣+绿豆诱集带种子包衣处理,对棉田绿盲蝽种群数量控制作用次之,控制期在100 d左右。单一棉花种子包衣处理控制效果低于上述处理,持效接近90 d。各处理对棉叶受害指数减退率的影响与其对绿盲蝽种群数量的控制结果基本一致,表明棉田吡虫啉颗粒剂穴施及液体制剂灌根施药是控制绿盲蝽为害的有效施药手段。
In order to explore the control effect of imidacloprid on population of Myzus persicae, the cotton seedlings were treated with seed coat, granules and irrigation treatments for two consecutive years from 2011 to 2012, and combined with the way of planting mung bean traps, The Influence of the Population of Lygus. When the effective content of imidacloprid was 1 500 g / hm ~ 2, three treatments were applied on the cotton granules and the mung bean traps with granules, Good, since the cotton seedling stage to mid-August flowering boll number of green lily bugs were 12,15,17,8,19 were lower than the economic threshold of damage, the control effective period of nearly 110 d; the effective dose of imidacloprid The treatment of 900g / hm ~ 2 cotton granules, the treatment of irrigating roots and the treatment of cotton seed coating + mung bean trap with 675g / hm ~ 2 active ingredient of imidacloprid, The second is the control, the control period is about 100 d. Single cotton seed coating control effect is lower than the above treatment, the effect of close to 90 d. The effect of each treatment on the rate of decline of cotton leaf damage index was basically consistent with the control results on the population number of Apolygus lucorum, which indicated that the application of imidacloprid granules in cotton field and liquid drenching and rooting were effective pesticides for controlling Apolygus lucorum.