共查询到19条相似文献,搜索用时 39 毫秒
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稻飞虱(Nilaparvata lugens Stal)是以稻属为食的单食性昆虫,刺吸稻株汁液危害水稻。建瓯全市水稻种植面积约3.5万hm2,稻飞虱年发生面积0.9万hm2,近几年来已成为建瓯市水稻的主要害虫之一。 相似文献
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2003年12月在荔城区新度镇进行几种不同药剂防治菜青虫田间药效试验结果表明,15%安打3000倍和5%锐劲特1500倍药后5d校正防效达92%以上,是防治菜青虫的优良药剂;生物农药0.1%千虫克600倍和2.5%菜喜i000倍药后5d校正防效分别为90.5%和86.28%,可作为防治菜青虫的推广药剂;新农药1.5%华戎1号防效一般,建议与其他农药混合使用。 相似文献
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江苏沿海地区防治甜菜夜蛾的药剂筛选试验 总被引:2,自引:1,他引:2
2002~2004年的室内外药效暨药剂筛选试验结果表明,24%美满(虫酰肼)SC、0.2%甲氨基阿维菌素苹甲酸盐EC等系列产品、15%安打(茚虫威)SC、75%拉维因(硫双威)WP+4.5%高效氯氰菊酯EC、30%万福星(灭辛)EC+2.5%功夫菊酯EC等农药品种和混配剂对甜菜夜蛾的防效均在85%以上,且上述各药剂的安全性能也较好,都可以作为江苏沿海地区防治甜菜夜蛾的首选药剂,在当地生产上推广并且交替使用。 相似文献
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对不同药剂防治高龄稻纵卷叶螟幼虫的药效进行了试验研究,试验表明:以5%锐劲特悬浮剂和20.2%稻卫乳油的防治效果和保叶效果最好,且药效期长、持效性好.40%毒死蜱、25%贝伐、三锐(三唑磷)对稻纵卷叶螟幼虫的速效性好,在特大发生的暴发年份,2类杀虫剂应交替使用. 相似文献
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Studies were made in 1989, 1990 and 1991 to establish whether carbendazim (MBC) had a direct therapeutic effect on sugar beet plants infected with beet mild yellowing virus (BMW), resulting in detectable yield benefits. In a field trial in 1989 virus-infected plots treated with carbendazim gave a significantly higher yield, of 0.66 t sugar/ha, than virus-infected plots sprayed with sulphur to control powdery mildew. This response to carbendazim in virus-inoculated plots was not repeated in subsequent trials in 1990 and 1991, and a glasshouse study showed no apparent effect on virus concentration within inoculated plants. Neither was any effect of carbendazim on symptom development observed in any of the trials or glasshouse experiments. 相似文献
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假眼小绿叶蝉为茶树重要害虫,以成、若虫剌吸茶树新梢汁液,被害嫩叶失绿,芽梢枯焦萎缩,质地变脆,严重影响茶叶的产量及品质。为探讨不同农药对假眼小绿叶蝉的防治效果,我站在茶园中进行药效试验。 相似文献
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在河西走廊自然条件下多年试验结果证明:采用覆膜栽培方式可使甜菜种子产量和经济效益得到明显提高,与露地栽培方式比其增产幅度为21.6%~35.5%,平均增产率达26.8%,增加经济效益7935.2元/hm2。 相似文献
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In 25 large-plot field trials in 1978–1980 the effects of recently approved granular pesticides on the establishment and yield of sugar beet were tested. Sugar yields were increased by some treatments at several sites where Docking disorder was anticipated, and plant populations and sugar yields increased at some sites containing severe infestations of soil pests. At several sites there was no response to pesticides, and greater selectivity in the use of granular pesticides on the UK sugar-beet crop is recommended. 相似文献
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采用桶栽试验,选用两个水稻品种,将水稻全生育期划分为插秧至有效分蘖终止期、有效分蘖终止期至幼穗分化始期、幼穗分化始期至减数分裂期、减数分裂期至齐穗期、齐穗期至乳熟期共5个时段,进行不同组合的保水、控水处理试验.结果表明:水稻整个生育期的五个生育时段随着保水时段的增加产量增加.幼穗分化始期至减数分裂期对水分极为敏感,此期保水具有增高、长穗、增粒、提高结实率和千粒重的作用. 相似文献