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[目的]筛选冬季清园时防治菱纹叶蝉有效药剂。[方法]通过室内毒力测定试验和田间防效试验研究了印楝素等5种植物源杀虫剂对菱纹叶蝉的防治效果。[结果]冬季清园使用0.5%藜芦碱可溶性液剂防治菱纹叶蝉,持效期长,可维持10~14 d,使用0.3%印楝素乳油持效期为7 d,菱纹叶蝉对它们十分敏感,是防治菱纹叶蝉比较理想的药剂,适宜推广;生产上推荐使用0.5%藜芦碱可溶性液剂1 000倍稀释液和0.3%印楝素乳油600倍稀释液冬春伐时防治菱纹叶蝉,可有效降低越冬基数。采用1.1%百部·楝·烟乳油防治桑树上菱纹叶蝉,不仅使用量低,而且残效消解快,无残留,不污染环境,建议在第1代菱纹叶蝉发生期使用1.1%百部·楝·烟乳油1 200倍稀释液。[结论]试验结果为菱纹叶蝉的有效防治提供了理论依据。 相似文献
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Manabu KUSUNOKI Toshiki SHIOMI Motowo KOBAYASHI Torao OKUDAIRA Akihiro OHASHI Teruo NOHIRA 《Journal of General Plant Pathology》2002,68(2):147-154
Phytoplasmas causing a severe decline of three tree species, i.e., Rhus javanica, Hovenia tomentella and Zizyphus jujuba, in Japan were examined for their transmissibility by a leafhopper species Hishimonus sellatus, and for their phylogenetic relatedness. By H. sellatus, Rhus yellows (RhY) phytoplasma was transmissible to white clover and periwinkle seedlings, causing typical symptoms in these
plants. Jujube witches' broom (JWB) phytoplasma was also transferred to the host plant, Z. jujuba, by the leafhopper. Because JWB phytoplasma was transmitted to Hovenia tomentella and caused the same symptoms as Hovenia witches' broom (HWB), JWB phytoplasma may be very closely related to HWB phytoplasma.
RFLP analysis of the PCR products of 16S rDNA revealed that RhY phytoplasma belongs to the Aster yellows (AY) group, and JWB
and HWB phytoplasmas belong to a different group (possibly Elm yellows group). Thus, we found that one species of leafhopper
can carry phylogenetically distant phytoplasmas.
Received 23 April 2001/ Accepted in revised form 29 October 2001 相似文献
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In 1998, rhus (Rhus javanica L.) yellows (RhY), caused by phytoplasma, was found in Miyagi Prefecture, Japan. In vector transmission tests, Hishimonus sellatus acquired RhY phytoplasma from diseased R. javanica and transmitted it to healthy R. javanica. Twenty-two species of herbaceous plants in 10 families were infected with RhY phytoplasma by H. sellatus. The host range and main symptoms on test plants of RhY phytoplasma differed from those of Macrosteles striifrons-transmitted phytoplasmas, which belong to the same 16Sr I group phytoplasma.
Received 6 December 1999/ Accepted in revised form 14 May 2000 相似文献
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本研究用６个对黄化型菱缩病不同抗性的桑品种为材料、调查不同品种的枝、叶外部形态、结构特征、化学成分与桑菱纹叶蝉虫口密度的相关性以及接种菱纹叶蝉后的发病率，以探讨不同抗病性桑品种对菱纹叶蝉的抗性。研究结果表明，高抗品种育２号、湘４５６枝条木栓化程度高，叶背沿叶脉表皮毛密厚、叶片总糖含量低、虫口密度小，媒介昆虫接种发病率低；感病品种湖桑３２号、湘７９２０枝条木质疏松，叶背沿叶脉表皮毛稀疏，叶片总糖含量 相似文献
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基于28S rDNA D2区序列的陕南凹缘菱纹叶蝉分子系统学与遗传多样性研究 总被引：1，自引：0，他引：1
为探讨陕南桑园凹缘菱纹叶蝉(Hishimonus sellatus Uhler)系统关系与遗传多样性,对陕南7个主要蚕桑产区共132头凹缘菱纹叶蝉的 28S rDNA基因D2区序列进行核苷酸多样性和遗传差异分析,同时研究单倍型之间的分子系统关系和网络进化图。结果表明,总群体共存在多态性位点63个,单倍型8个,优势单倍型H_1占单倍型总数的74.2%,遗传分化程度较低。分子方差分析显示:种群内变异占总组分的98.94%,差异不显著,且其基因流系数Nst和种群地理距离之间不存在相关性(R~2=0.019 7),说明各个地理种群之间存在渐渗杂交。 相似文献
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