共查询到20条相似文献,搜索用时 93 毫秒
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2006年,对农三师五十一团棉铃虫进行了详细地调查,调查结果发现:在5月18日至8月10日期间,棉铃虫共发生了3代,即第1代、第2代、第3代;随后对黑光灯、杨树枝把和性诱剂3种测报方法的效果进行了比较,结果发现:在棉铃虫第1代、第2代、第3代发生期,黑光灯诱蛾的方法最为准确,能较好地反映出棉铃虫成虫的消长规律。 相似文献
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通过对阜阳市历年棉铃虫发生情况的研究,建立了棉铃虫各代及年发生程度和防治适期的气象预报模式,并应用于实际预报效果较理想. 相似文献
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探讨使用环境友好复合型防治害虫中试药剂扫虫光防治瓜菜害虫的发生与危害及其对作物生长发育的安全性,比较分析扫虫光对棉铃虫的防治效果及其处理对辣椒的安全性,试验结果表明:扫虫光1 000倍液、1 500倍稀释液不仅对棉铃虫具有良好的防治效果,而且对植株生长安全;扫虫光500倍液虽然对棉铃虫具有良好防治效果,但植株生长畸形。因此,综合考虑经济、高效和简便等因素,扫虫光1 000-1 500倍稀释液可广泛用于防治瓜菜棉铃虫的发生与危害。 相似文献
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虱螨脲对棉铃虫的生物活性及应用研究 总被引:1,自引:0,他引:1
试验测定了虱螨脲对棉铃虫的室内生物活性和田闻防治效果。结果表明,虱螨脲具有较强的杀卵作用。在50mg/L浓度下。棉铃虫1日龄卵死亡率达到87.30%;对棉铃虫2~5龄幼虫具有较高的胃毒活性,其LC50分别为0.7434mg/L、1.9669mg/L、2.0592mg/L和2.6945mg/L。田间试验结果表明。在卵高峰期至初孵期用药,对棉铃虫有较高的防治效果,药后7d.用50g/L虱螨脲EC450mL/hm2、600mL/hm2防治效果分剐为89.3%、90.2%。 相似文献
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Omaththage P. Perera Kerry C. Allen Devendra Jain Matthew Purcell Nathan S. Little Randall G. Luttrell 《Journal of insect science (Online)》2015,15(1)
Rapid identification of invasive species is crucial for deploying management strategies to prevent establishment. Recent Helicoverpa armigera (Hübner) invasions and subsequent establishment in South America has increased the risk of this species invading North America. Morphological similarities make differentiation of H. armigera from the native Helicoverpa zea (Boddie) difficult. Characteristics of adult male genitalia and nucleotide sequence differences in mitochondrial DNA are two of the currently available methods to differentiate these two species. However, current methods are likely too slow to be employed as rapid detection methods. In this study, conserved differences in the internal transcribed spacer 1 (ITS1) of the ribosomal RNA genes were used to develop species-specific oligonucleotide primers that amplified ITS1 fragments of 147 and 334 bp from H. armigera and H. zea, respectively. An amplicon (83 bp) from a conserved region of 18S ribosomal RNA subunit served as a positive control. Melting temperature differences in ITS1 amplicons yielded species-specific dissociation curves that could be used in high resolution melt analysis to differentiate the two Helicoverpa species. In addition, a rapid and inexpensive procedure for obtaining amplifiable genomic DNA from a small amount of tissue was identified. Under optimal conditions, the process was able to detect DNA from one H. armigera leg in a pool of 25 legs. The high resolution melt analysis combined with rapid DNA extraction could be used as an inexpensive method to genetically differentiate large numbers of H. armigera and H. zea using readily available reagents. 相似文献
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