共查询到20条相似文献,搜索用时 109 毫秒
1.
葡萄根瘤蚜为害症状及其防治陕西农科院植保所韩学俭葡萄根瘤蚜,属同翅目,瘤蚜科,又名葡萄根蚜虫。此虫原产北美东部,已传布世界各国。因其为世界著名的葡萄毁灭性害虫,故被列为国际和国内重要检疫对象之一。此虫只为害Vins属葡萄。1为害症状成、若虫均以刺吸式... 相似文献
2.
3.
全苏葡萄根瘤蚜防治科研站经多年试验研究证实。应用六氯丁二烯防治根瘤蚜效果最佳。熏蒸杀虫剂六氯丁二烯具有持久的防效,可3~5年为一个周期施用一次。每个循环的两季之间,根据土壤气候条件和葡萄植株的树龄,一公顷用药400~750g加2~3倍细土施入地内熏蒸。葡萄根瘤蚜为植物检疫对象,主要靠在发生初期及时进行葡萄园处理,消灭在为害之前。在防治中要确定各葡萄种植区最佳重复熏蒸期限,必须查清它们的种群 相似文献
4.
5.
6.
为建立葡萄根瘤蚜实时荧光定量PCR的检测方法,参考Karen Herbert等设计的特异性引物与TaqMan-MGB荧光探针,构建以标准阳性质粒作为标准品制作标准曲线,并经优化反应条件,建立葡萄根瘤蚜的实时荧光PCR绝对定量检测方法,进行敏感性和重复性试验,并对受葡萄根瘤蚜为害的葡萄根际土壤进行初步定性检测.结果表明:该方法的灵敏度可达1.625拷贝/μL,3次重复检测的变异系数均小于5%.提取0.25g含有10头葡萄根瘤蚜若虫土壤的DNA,并将其梯度稀释,用建立的荧光定量PCR进行检测,将DNA稀释103倍后,仍能检测出阳性结果.对受害葡萄根际土壤检测结果为阳性.葡萄根瘤蚜TaqMan-MGB探针实时荧光PCR检测技术具有特异性强,敏感性高,易操作等优点,有很好的应用前景和研究价值. 相似文献
7.
现在已知为害长山核桃的根瘤蚜有4种,即长山核桃根瘤蚜Phylloxerans devastatrix Pergande、警根瘤蚜 P.notabilis Pergande、南方长山核桃根瘤蚜P.russellae Stoetzel和长山核桃栎叶根瘤蚜的P.texana Stoetzel。本文记述了各种根瘤蚜地理分布、虫瘿形成、生物学发育 相似文献
8.
9.
葡萄根瘤蚜是葡萄树上的毁灭性害虫,也是世界上第1个检疫对象。最早关于葡萄根瘤蚜的描述是在1856年,当时美国纽约州发现当地的葡萄叶片上有虫瘿。1860年前后其传入法国,给法国的葡萄和葡萄酒产业以致命的打击。与此同时,葡萄根瘤蚜 相似文献
10.
11.
M. Suffert 《EPPO Bulletin》2012,42(2):181-184
In 2011, EPPO conducted a survey among its member countries to re‐evaluate the status of 14 pests currently listed on the EPPO A2 List of pests recommended for regulation as quarantine pests: Cacoecimorpha pronubana, Cacyreus marshalli, Ciborinia camelliae, Dickeya (Erwinia) chrysanthemi pv. dianthicola, Frankliniella occidentalis, Impatiens necrotic spot virus, Leptinotarsa decemlineata, Phialophora cinerescens, Puccina horiana, Quadraspidiotus perniciosus, Raspberry ringspot virus, Tomato spotted wilt virus, Viteus vitifoliae, Xanthomonas fragariae. As a result of the survey, it was concluded that all these pests should be maintained on the A2 List. 相似文献
12.
《EPPO Bulletin》2009,39(3):484-485
Specific scope
This standard describes a short duration hot water treatment of grapevine against Viteus vitifoliae and other external pests. It is an alternative to the standard PM 10/in preparation Fumigation of grapevine to control Viteus vitifoliae (previously PM 3/19). A standard on long duration hot water treatment of grapevine against Flavescence dorée and other grapevine diseases is in preparation.Specific approval and amendment
First approved in 2009–09.13.
新亚欧大陆桥新疆段环境灾害的模糊马尔可夫链状预测 总被引:3,自引:0,他引:3
本文根据新亚欧大陆桥新疆段近 40年环境灾害统计资料 ,基于模糊马尔可夫链状预测的方法及原理 ,通过对陆桥新疆段受损状况的模糊状态划分和模糊运算 ,确立受损等级 ,根据隶属度最大原则 ,确定所属状态 ,进行灾害预测 ,预测准确率接近 80 %。 相似文献
14.
15.
Rodents often damage crops throughout the growing season, from germination to harvest, thus making it difficult to understand the cumulative effects of rodent damage for crops such as rice that are able to partially compensate for damage. Compensation can make it difficult to understand the impact of variable rodent damage in terms of when the damage occurs, its severity and thus when, whether and how rodent pests should be controlled. The compensatory responses of rice to simulated rat damage carried out at different growth stages and at different spatial levels of severity showed that higher yield was recorded during the wet season in comparison to the dry season. However, yield loss was observed during all cropping stages for all levels of simulated damage for wet and dry season crops, with significant compensation noted at the transplanting [14 days after sowing (DAS)] and vegetative (45 DAS) stages. Only damage at the maturity (110 DAS) stage resulted in significant reductions in rice crop yield. Seasonal differences suggest water availability was an important factor that perhaps enhanced rice production. The ability of rice to compensate for early rodent damage could potentially reduce a farmer's perception of damage. However, failing to control rodents at these earlier crop growth stages could lead to increased rodent populations at the time of maturity when compensatory effects are limited. 相似文献
16.
本研究测定了水稻对稻纵卷叶螟为害的单株水平动态生理补偿效应,同时测定了稻纵卷叶螟为害对水稻经济性状的影响。结果表明:受害叶表观光合强度下降,其幅度与受害程度、叶位及受害后时间有关;剑叶受害后同株未受害的倒二叶则对受害功能叶具有一定的补偿作用,表观光合强度增强,增强幅度与剑叶被害程度和披害后时间有关。在孕穗与抽穗期,幼虫所造成的为害,对水稻经济性状有不同程度的影响,其中结实率与幼虫密度呈负相关,产量损失率与幼虫密度呈正相关;而对有效穗数、每穗粒数及千粒重的影响则不显著。另外,作者从群体和个体水平分别讨论了水稻对稻纵卷叶螟力害的损失与补偿问题。 相似文献
17.
运城市主要果树近年来均有不同程度花期冻害发生,为减少冻害损失,制定更具生产指导意义的农业气象灾害指标以及农业气象灾害标准,文中以运城市主要种植果树苹果、梨、桃、杏花器官为研究对象,利用智能人工气候箱模拟自然降温进行研究.结果表明:运城市苹果花期、梨花期、杏花期遭受冻害临界温度均为-2℃,桃花期遭受冻害临界温度为-3℃;... 相似文献
18.
黑龙江省低温冷害时空分布规律与发生预测研究 总被引:2,自引:0,他引:2
文中利用黑龙江省74个气象站35年(1971~2005年)夏季5~9月平均气温资料,与GIS相耦合,首次对黑龙江省低温冷害进行了县(市)级的时空分布规律分析,并运用灰色分析模型对黑龙江省未来低温冷害的发生情况做了预测。研究结果表明:黑龙江省低温冷害发生次数20世纪70年代为最大,80年代后呈下降趋势;在空间分布上,黑龙江省低温冷害的平均发生频率南方大于北方,严重冷害表现为北方大于南方,一般冷害则表现为中部及西南部地区大于全省其它地区;低温冷害的发生与厄尔尼诺现象有很大的相关性,厄尔尼诺年及其前后年为低温冷害的多发年。2009~2020年黑龙江省大部分地区会发生低温冷害,2020~2030年发生区域和频率有所减少,2030年后发生频率与地区明显减少,未来黑龙江省低温冷害的发生将多集中于北部和中部地区。 相似文献
19.
Pocket gophers cause extensive damage to reforestation plantings in the western United States, and pose acute and chronic problems for forest managers. We examine the components of an integrated pest management strategy for reducing pocket gopher damage to conifers: the predictive factors for assessing the risk for damage, techniques for monitoring gopher populations and assessing efficacy of control methods, and damage control strategies and methods. The information in each component is reviewed and presented so that an optimal damage reduction plan can be developed in a logical, cost-effective, environmentally responsible fashion. 相似文献
20.
上海郊区农田杂草危害调查及其防除策略 总被引:1,自引:0,他引:1
根据农田杂草的相对覆盖度、高度、多度制订了5级目测草害调查方法,三年中调查了不同类型田5500块,调查结果表明,稗、异型莎草在稻田出现频率达100%和93%,危害面积达35.2%和23.2%;看麦娘、牛繁缕、春蓼在麦田出现频率为74.0%、86.0%、56.5%,危害面积达29.16%、32.84%、18.72%;千金子、马唐在棉田出现频率为99.6%、94.0%,危害面积达58.8%、36.4%;危害的种类、程度因土壤pH、轮作制度、土质、防除水平不同而异。在防除工作中要抓住主要作物和重点草害,注重农业防除,协调必要的化学除草。 相似文献