陕西省夏播玉米田叶螨发生及抗性治理对策研究

Study on resistible control of leaf mites upon corn summer seeding in Shaanxi

陕西夏播玉米田叶螨有 3种 ,截形叶螨TetranychustruncatusEhara为优势种 ,年发生 12～ 13代 ,以雌成螨越冬 ,6月下～ 7月初迁入夏播玉米田 ,7月中— 8月下是为害高峰及防治的关键时期 .发生为害面积约 2 5万hm2 ,减产 10 %～ 2 0 % .繁殖力强、食料条件优越是叶螨暴发的根本原因 ;整体防治不重视 ,抗药性强 ,自然天敌控制弱等是大面积暴发的主要因素 .清除田间杂草 ,区域联片种植、培肥地力、促进玉米发育、结合追肥根施药剂及轮换用药等是综合治理抗性叶螨的重要技术措施 .

There are 3 species of leaf mites upon corn summer seeding in Shaanxi. Among them, Tetranychus truncatus Ehara is the dominant species. it propagates 12～13 generations per year, overwinter by female adult mites. From late June to early July, migrate to corn summer seeding. From mid July to late August been crucial period as peak of damage and important key link of control. Damaged acreage reach to 0.25 million hm^2.Production declines 10%～20%. Heavy reproduction, abundant diet, integrate control unseriously, heavy insecticidal resistant and weak natural enemies are the main factors for great outbreak area by leaf mites. Weeds eradication, regional continuous planting, adequate fertilization, rotational insecticide control are important technical measures of integrate control to truncate leaf mites.