小麦返青后,随着气温回升,生长发育进程的加快,病虫草也相继发生和为害。因此,必须及时防治,以减轻危害。 3月份是防治麦田杂草的适期,以早用药除治为好。可亩选用20％二甲四氯200克、80％阔叶净1.6—3.1克、72％2,4—D丁酯30—50克或10％苯磺隆8—10克进行防治。3月中下旬麦红蜘蛛进入繁殖为害盛期,对一尺单行有虫200头以上的田块,用40％氧化乐果、50％对硫磷或久效磷2000—2500倍液喷雾防治,亦可结合除治杂草进行。 4月上旬,当每米双行有10头以上麦叶蜂时,可用90％晶体敌百虫或2.5％敌杀死1000倍液除治。此外,还要搞好麦蚜和灰飞虱的监 After the wheat turns green, with the temperature rise, the process of growth and development is accelerated, and the diseases and insect pests also occur one after another. Therefore, we must take timely control to reduce the harm. March is the weed control wheat field, early treatment in addition to cure as well. Mu can be used 20% 20% MCPA 200 grams, 80% broadleaf net 1.6-3.1 grams, 72% 2,4-D butyl 30-50 grams or 10% tribenuron 8-10 grams for control. In mid to late March, the spider mite enters the breeding stage, and on the one foot with more than 200 pests, it is sprayed with 2000-2500 times of 40% omethoate, 50% parathion or monocrotophos, Can also be combined with the weed treatment. In early April, when there are more than 10 wheat leaf bees per meter in double rows, 90% crystal trichlorfon or 2.5% enemy can kill 1000 times. In addition, we must do a good job of monitoring wheat aphids and Laodelphax striatellus