油菜田害虫调查及蚜虫防治药剂筛选

田间调查试验表明,合肥市油菜田害虫的发生种类有15种,主要害虫为蚜虫类、油菜潜叶蝇Phytomyza horticola、小菜蛾Plutella maculipennis和菜青虫Pieris rapae。其中,以蚜虫类危害最重,全生育期在冬、春季各有一个峰值。油菜苗期以萝卜蚜、小菜蛾危害较重,后期以桃蚜Myzus persicae、油菜潜叶蝇危害较重。蚜虫防治药剂筛选试验表明,70%吡虫啉水分散粒剂防治蚜虫药效高,持效期长,且对油菜安全,10%烯啶虫胺可溶液剂和25%吡蚜酮可湿性粉剂防效也较好,可作为70%吡虫啉水分散粒剂的轮换药剂。

Surveys of oilseed rape insect pest and screening test of aphids controlling agents

Pest species in oilseed rape fields in Hefei was investigated using field surveys and the efficacy of several pesticides in controlling these pests was tested. Fifteen species of insect pests were found; aphids, rapeseed leaf miner,diamondback moth and Pieris rapae. Of these,aphids were the most harmful. In the oilseed rape growth period,aphids had two population peaks,one in winter and another in spring. In the oilseed rape seedling period the radish aphid and the diamondback moth were the dominant species,while in the pod period,the green peach aphid and leaf miner were the main species. A chemical screening test showed that 70% Imidacloprid WDG had the highest control efficacy for aphids with a longer control period and good plant safety. The control effects of 10% Nitenpyram SL and 25% Pymetrozine WP was also good,these pesticides could be used as replacements for 70% Imidacloprid WDG.