摘要
为了明确防治水稻穗期灰飞虱的适宜时间,以水稻品种甬优12号为试材,分别在水稻破口前5 d(8月26日)、破口期(8月31日)、齐穗期(9月7日)、齐穗后5 d(9月12日)和齐穗后10 d(9月17日)喷施25%吡蚜酮可湿性粉剂225 g/hm2+40%毒死蜱乳油1 125 mL/hm2,研究不同施药时期对水稻穗期灰飞虱的田间药效。结果表明:在破口前5 d或破口期施药,对降低水稻灌浆盛期的灰飞虱虫口密度无显著影响;而在齐穗期～齐穗后10 d施药,能有效控制灌浆期灰飞虱的发生。因此我们认为,采用25%吡蚜酮225 g/hm2+40%毒死蜱1 125 mL/hm2防治水稻穗期灰飞虱时,防治适期为水稻齐穗后10 d内,即9月7～17日。
To identify the proper time of protecting rice from Laoclelphax striatellus in panicle stage, using rice variety Yongyou No. 12 as the test material, 1 125 mL/hm2 of 25% pymetrozine wettable powder and 225 g/hm2 of 40% chlorpyrifos EC were sprayed in 5 different periods of rice including 5 days before break （Augnst,26） , break stage （ August 31 ）, full heading stage （ September 7）, 5 days after heading （ September 12 ） and l0 days after heading （September 17 ）. The field efficacy of different spraying stages to control Laodelphax striatellus in rice panicle stage was studied. The results indicated that there was no significant effects on reducing the insect density applied pesticides in 5 days before break and break stage, and the Laodelphax striatellus was effectively controlled applied from full heading stage to 5 days after heading. Therefore, the optimum sprayed period of pesticide against Laodelphax striatellus in rice panicle stage was within 10 days after heading when using the pesticides of 25% pymetrozine wettable powder225 g/hm2 and 40% ehlorpyrifos EC.
出处
《河北农业科学》
2013年第1期50-52,共3页
Journal of Hebei Agricultural Sciences
关键词
水稻
穗期
灰飞虱
防治适期
Rice
Panicle stage
Laodelphax striatellus
Optimum sprayed period of pesticide
