共查询到14条相似文献，搜索用时 140 毫秒
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为了解茶丽纹象甲成虫的取食习性及为害性,以便为制订防治指标提供参考,本文开展了茶丽纹象甲成虫对茶树品种与叶位的选择性、食量等室内试验和不同虫口密度、不同品种下的茶园小区为害损失研究.结果表明,茶丽纹象甲成虫对不同品种茶梢具有明显的选择性,表现为丹桂>福云6号>黄棪.成虫期取食量(叶面积,mm2)为丹桂>黄棪>福云6号,但无显著差异.当喂饲福云6号品种茶梢时,在1~4对饲养密度下,每对成虫取食时长平均为11.8 d,在1对饲养密度下,每对成虫平均寿命为13.75±1.0 d;与老叶相比,茶丽纹象甲成虫倾向于取食新叶;茶丽纹象甲对福云6号品种的危害系数(每对成虫)为1.65 g,茶园虫口密度(x,头·m-2)与减产量(y,g·0.11m-2)的回归方程为:y = 0.0184x + 0.5611,对于亩产量100~125 kg的福云6号茶园,使用目前的防治指标(成龄投产茶园每平方米虫量在15头以上)是合适的.室内茶丽纹象甲在丹桂品种上的取食量比福云6号品种提高29.24%,在茶园虫口密度为10 头·m-2时引起茶青产量显著损失,虫口密度与减产量的回归方程为:y = 0.0665x + 0.7969,防治指标建议定为成龄投产茶园每平方米虫量10头以上. 相似文献
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锐劲特是一类新型苯基吡唑类茶虫剂,对半翅目、鳞翅目、鞘翅目和缨翅目等害虫均有极高的活性。毒性低,以胃毒作用为主,兼具触杀和一定的内吸作用。与其他杀虫剂没有交互抗性,对丽纹象甲特效。茶园小区试验:锐劲特1000倍液,药后1d、3d、7d防效分别为92.3%、98.7%和96.2%。锐劲特速效性好,特效期长,毒性低,是无公害茶园理想的防治药剂。应用时,可同防治小绿叶蝉、黑刺粉虱药剂混合使用,不仅可提高药效,同时可扩大防治范围。应用锐劲特防治茶丽纹象甲(文摘)@林宗学 相似文献
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在福安进行了4种不同类型农药使用效果综合评价茶园小区试验,0.5%藜芦碱粉剂800倍液防治茶小绿叶蝉、茶蚜、茶丽纹象甲效果良好,对茶园蜘蛛有一定的杀伤力,但药后15 d可正常恢复,对茶园节肢动物群落结构总体上有积极作用;70%吡虫啉水分散粒剂15000倍液防治茶小绿叶蝉、茶蚜效果良好,对茶园蜘蛛安全,对茶园节肢动物群落结构的影响相对较轻;99%矿物油50倍液防治茶小绿叶蝉、螨类的效果较好,对茶园蜘蛛有一定的杀伤力,但药后15 d可正常恢复,对生态系统结构有负面影响趋势;2.5%联苯菊酯乳油1000倍液防治茶蚜、螨类效果较佳,对茶园蜘蛛有较强的杀伤力,对生态系统结构有负面影响趋势。 相似文献
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锐劲特是一类新型苯基吡唑类茶虫剂,对半翅目、鳞翅目、鞘翅目和缨翅目等害虫均有极高的活性。毒性低,以胃毒作用为主,兼具触杀和一定的内吸作用。与其他杀虫剂没有交互抗性,对丽纹象甲特效。茶园小区试验:锐劲特1000倍液,药后1d、3d、7d防效分别为92.3%、98.7%和96.2%。锐劲特速效性好,持效期长,毒性低,是无公害茶园理想的防治药剂。应用时,可同防治小绿叶蝉、黑刺粉虱药剂混合使用,不仅可提高药效,同时可扩大防治范围。(林宗学)摘自《福建农业》2005年1期应用锐劲特防治茶丽纹象甲(文摘)@林宗学… 相似文献
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随着黑龙江省马铃薯地上垄体栽培模式推广面积的逐年增加,其害虫的防控技术已经成为制约该模式下马铃薯生产的重要环节,为解决这一问题,特设立6种化学及生物杀虫剂(5%吡虫啉乳油2 000倍液、3%啶虫脒乳油3 000倍液、48%乐斯本乳油2 000倍液、30%速克毙乳油2 000倍液、40%氧化乐果乳油2 000倍液、2%阿维菌素乳油2 000倍液)进行马铃薯瓢虫及蚜虫的田间药效比较试验及3%啶虫脒乳油对马铃薯瓢虫幼虫的室内杀虫活性的测定。经过对校正防效和虫口减退率比较分析,结果表明:3%啶虫脒乳油对马铃薯瓢虫与蚜虫施药7 d后的防效最高,分别达到84.94%和94.99%;其虫口减退率也最高,分别达到77.12%和92.04%。通过对LD50值比较6种药剂对马铃薯瓢虫的毒力,其中毒力最大的为3%啶虫脒乳油,LD50值为0.05。3%啶虫脒乳油对马铃薯瓢虫幼虫的72 h LD50为21.22 mg/L。由此可见,3%啶虫脒乳油是防治马铃薯瓢虫及蚜虫的有效药剂。 相似文献
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In laboratory tests conducted to determine the effectiveness of the exotoxin ofBacillus thuringiensis against the Colorado potato beetle,Leptinotarsa decemlineata (Say), applications sprayed on tomato foliage at dilutions ranging from 10?1 through 10?4 killed 90% of the 1st and 2nd stage beetle larvae. As the dosage decreased, the time to achieve this level of mortality increased from 4 to 9 days. Adult beetles were not killed by these treatments; however they did cease feeding. In field tests, the highest dosages ofB. t. sprayed on either tomato or potato plants provided adequate or nearly complete protection when applied weekly. Young larvae that ingested sub-lethal doses developed into adults with atrophied mouthparts and antennae, transformations of the paired parts of the labial palps into an unpaired part, the appearance of a tarsal-like claw on a palp, and malformation of the cranial sclerities. 相似文献
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Laboratory bioassays were conducted to evaluate the insecticidal effect of two pirimiphos-methyl formulations, an emulsifiable concentrate (EC) and a capsule suspension (CS) against adults of Sitophilus oryzae, Rhyzopertha dominica and Tribolium confusum in wheat, maize and rice. Pirimiphos-methyl was applied at two dose rates, 2 and 4 ppm, and adult mortality was measured after 2, 7, 14 and 21 days of exposure in the treated commodity. Progeny production was assessed 65 d after the removal of the parental adults. S. oryzae adult survival was significantly higher in rice than in wheat and maize, whereas T. confusum mortality was significantly higher in maize than in the other grains. From the species tested, the most susceptible species was S. oryzae, for which mortality reached 100% after 7 days of exposure in treated wheat and maize, followed by T. confusum and R. dominica. Progeny production was significantly suppressed by pirimiphos-methyl in the case of S. oryzae, but not in the case of R. dominica. In general, only few differences in performance between the EC and the CS formulation were detected. We conclude that the type of grain commodity significantly affects mortality after the application of the two pirimiphos-methyl formulations tested, but this effect is species-dependent. 相似文献
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The effectiveness of vacuum (V) treatment alone and in combination with an oxygen absorber (V + A) for suppression of grain infestation by Sitophilus granarius L. were compared under laboratory conditions. The effectiveness of the treatment methods was evaluated at different temperatures (15, 25 °C) and exposure times (7, 14, 21, 28 days). We evaluated both the effects on adults present in grain interspaces and hidden infestations within the kernels in terms of treatment time separately. Adults of S. granarius present in grain interspaces were more susceptible to both treatments than hidden infestations developing within kernels. At 25 °C, total mortality of adults in grain interspaces was achieved after 10 days of exposure whereas total suppression of hidden infestations was achieved after 3 weeks. Higher temperature and longer exposure correlated with a greater effectiveness of the tested treatments. The addition of an oxygen absorber to the vacuum treatment (V + A) showed the general tendency of improving the effectiveness of the vacuum treatment on suppression of hidden infestations; significant differences between the V + A and V treatments were prominent primarily at the lower temperature tested. Reduction of hidden infestation was achieved after 3 weeks of exposure to V + A treatment (99.8%) and after 4 weeks of V treatment (95.8%) at 15 °C. 相似文献