排序方式: 共有41条查询结果,搜索用时 15 毫秒
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为减轻设施秋番茄温室白粉虱发生危害,减少化学农药用量、残留和环境污染,采用测报调查、随机区组设计和统计分析等方法,开展了生物农药阿维菌素 赤.吲乙.芸苔(碧护)和苦参碱 碧护和生化复配制剂甲维盐 碧护防治设施秋番茄温室白粉虱农药田间药效试验。结果表明,在温室大棚秋季番茄白粉虱发生较重情况下,每hm2用1.8%阿维菌素EC375g 碧护600g、1.5%苦参碱SL4500mL 碧护600g和生化复配制剂5.7%甲维盐SG450g 碧护600g,7天施药1次,连续施用4次,药后10天、17天、26天和35天,防治效果均在81%、83%、85%和81%以上,且药后10天和17天甲维盐 碧护与阿维菌素 碧护、阿维菌素 碧护与苦参碱 碧护差异不显著,甲维盐 碧护显著高于苦参碱 碧护。阿维菌素 碧护、苦参碱 碧护和甲维盐 碧护不仅可以作为防治设施番茄温室白粉虱的理想药剂,而且可以作为现代农业示范区、无公害农产品、绿色农产品和有机农产品防治温室白粉虱的理想药剂。 相似文献
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球孢白僵菌与苦参碱混配对烟粉虱的毒力与田间防效 总被引:1,自引:0,他引:1
旨在探讨球孢白僵菌与8种杀虫剂的相容性以及球孢白僵菌与苦参碱混配对温室烟粉虱的防治效果。首先进行8种杀虫剂与球孢白僵菌的相容性试验,然后选择相容性较高的苦参碱与球孢白僵菌的LC_(50)浓度以9∶1、4∶1、1∶1、1∶4和1∶9体积比进行混配,以共毒系数对其毒力进行评价。结果表明:苦参碱与球孢白僵菌的相容性最好,尤其在10倍稀释度下,苦参碱对球孢白僵菌孢子萌发、菌丝生长及产孢抑制率分别为14.44%、10.17%和12.63%。苦参碱与球孢白僵菌体积比为4∶1时,共毒系数为293,增效作用最明显。综上所述,苦参碱与球孢白僵菌在LC_(50)浓度下以4∶1体积比混配具有极显著的增效作用。 相似文献
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0.3%苦参碱对茶园假眼小绿叶蝉及茶蚕的防治效果 总被引:1,自引:0,他引:1
[目的]探讨生物农药苦参碱对小绿叶蝉、茶蚕的防治效果。[方法]设置小区试验、大田防治试验和室内试验,测定苦参碱对假眼小绿叶蝉及茶蚕的防治效果。[结果]小区试验喷施0.3%苦参碱水剂1000、1200倍液后1、5d,对假眼小绿叶蝉的防治效果优于10%蚜虱净可湿性粉剂4000倍液,喷后10d0.3%苦参碱水剂1000倍液的防治效果与蚜虱净相近,但0.3苦参碱水剂1200倍液不及蚜虱净;大田试验中,0.3%苦参碱水剂1000倍液喷后5、10d的防治效果分别为89.56%和80.16%;0.3%苦参碱水剂1000倍液对茶蚕也有一定的防治效果。[结论]苦参碱对假眼小绿叶蝉和茶蚕具有良好的防治效果。 相似文献
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采用叶片浸渍法测定了苦参碱与阿维菌素混配对牛蒡长管蚜的增效作用及两种药剂混配的最佳配比。结果表明,当2种药剂之比为(17.59~105.56):1时,混配制剂表现出较明显的增效作用;当2种药剂之比为27:1时,增效作用最强,此时的共毒系数为147.1011。田间试验结果表明,苦参碱与阿维菌素按有效成分为27:1进行混配后的1500、2000、2500倍液对牛蒡长管蚜有较好的防治效果。 相似文献
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WU Bin ZENG Yao-ying CAI Xiao-chang SHI Jun CONG Lin WANG Tong ZENG Xiang-feng 《园艺学报》2007,23(7):1368-1372
AIM: To analyze the effects of oxymatrine (OMT) on the quantity of murine regulatory T cells (Tr cells) in the peripheral blood and mouse lymphocyte proliferation stimulated by Con A, and to probe into the immunological mechanism that OMT treats allergic contact dermatitis (ACD).METHODS: An ACD mouse model stimulated by dinitrofluorobenzene (DNFB) was established. Different dosages of OMT, PBS and hydrocortisone (HCT) were intraperitoneally injected (IP) into the mice. Blood samples were collected at〖JP+2〗 1 d, 7 d, 14 d, 21 d and 28 d, then the T cells were isolated and marked with anti-CD3, anti-CD4, anti-CD25 three-colored immune fluorescence antibody to detect the quantity of CD4+CD25+ T cells with flow cytometry. The fluorescence intensity changes of lymphocytes which were isolated from mouses lymph node and co-stimulated by polyclonal stimulator Con A and OMT were examined by carboxyfluorescein diacetate succinimidyl ester (CFDA-SE) staining and flow cytometry. RESULTS: OMT at concentrations of 500, 125 and 31 mg/L had the ability to restrain the proliferation of lymphocytes from lymph node in a dose dependent manner. However, OMT at concentrations of 16, 8, 4 and 2 mg/L promoted the proliferation of T lymphocytes from lymph node, but was not obviously dependent on its concentration. Intraperitoneal injection of OMT increased the numbers of CD4+CD25+T cell in peripheral blood obviously (P<0.01). CONCLUSION: The effects of OMT on the proliferation of T lymphocytes from mouses lymph node cells are observed, OMT also increases the CD4+CD25+T cells in the peripheral blood, implying that OMT is a kind of immunoregulator with dual effects. 相似文献
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