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药剂混配对梨木虱的毒力及药效测定 总被引:2,自引:1,他引:1
为了筛选防治梨木虱的高效药剂,采用药膜法测定了不同药剂组合对梨木虱成虫的毒力,通过田间药效试验,评价了药剂和药剂组合对梨木虱成虫和若虫的防治效果。结果表明:阿维菌素对梨木虱成虫显示了较高的触杀毒力,LC50为0.9877 mg/L,阿维菌素与吡虫啉质量比1:1混配也显示了较突出的触杀效果,LC50为1.2145 mg/L;田间药效结果表明,阿维菌素与吡虫啉/啶虫脒混配对梨木虱成虫有较好的防效,10天内防效均在80%以上,阿维菌素与吡虫啉/啶虫脒混配对梨木虱若虫也显示了较好的防效,10天防效均在90%以上。 相似文献
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为筛选防治草地贪夜蛾的高效安全药剂,本研究以草地贪夜蛾幼虫为试验对象,采用浸渍法测定了5种杀虫剂对草地贪夜蛾的室内毒力,并进行田间防效试验。室内毒力试验结果表明,5种供试杀虫剂对草地贪夜蛾均有不同程度的毒杀作用,其LC50值的大小顺序为:5%甲维盐ME<60 g/L乙基多杀菌素SC<10%虫螨腈SC<40%辛硫磷EC<90%敌百虫SP。田间防效试验结果表明,5种供试杀虫剂都对草地贪夜蛾幼虫有很好的防治效果,60 g/L乙基多杀菌素SC、10%虫螨腈SC和40%辛硫磷EC在72 h后防效均可达到100%,5%甲维盐ME和90%敌百虫SP在72 h后防效达到90%以上。因此,这5种杀虫剂可作为防治草地贪夜蛾的有效药剂。 相似文献
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豇豆蓟马发生规律及防治药剂筛选的研究 总被引:1,自引:0,他引:1
为探明在冬种豇豆的整个生育期内,为害豇豆的蓟马种类及各种蓟马的种群消长情况,于2014—2016年在海南三亚开展了冬种豇豆的蓟马种类和数量的调查。结果表明:为害豇豆的蓟马有4种,即豆大蓟马、花蓟马、棕榈蓟马和黄胸蓟马;其中,豆大蓟马与棕榈蓟马在豇豆的整个生育期内均可为害,花蓟马与黄胸蓟马仅在花期发生。豆大蓟马为豇豆蓟马的优势种,其发生高峰期在豇豆的盛花期;其次是花蓟马,其数量在豇豆生长后期逐渐增加;棕榈蓟马的数量在豇豆花期虽有所增加,但始终维持在较低水平;黄胸蓟马仅偶尔出现,且数量极少。为了解新型杀虫剂对豇豆蓟马的防效,采用喷雾法,开展了豇豆蓟马的田间药效试验。试验结果表明:在参试的5种新型药剂中,乙基多杀菌素和苦参碱对豇豆蓟马具有较好的防效,药后3天防效分别为79.14%和62.14%,高于对照药剂啶虫脒的防效。药后7天,所有参试药剂对豇豆蓟马的防效均不理想,除了乙基多杀菌素,其余药剂防效均小于50%。在参试的药剂中,乙基多杀菌素、苦参碱对豇豆蓟马具有较好的防效,可以与啶虫脒轮换使用,用于豇豆蓟马的田间防治。 相似文献
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6种杀虫剂对香蕉花蓟马的室内毒力测定 总被引:5,自引:1,他引:4
香蕉花蓟马Thrips hamaiiensis (Morgan)在香蕉园中普遍发生,对香蕉生产造成危害。为了筛选到更多防治香蕉花蓟马的有效药剂,指导田间施药,本文采用滤纸药膜法,进行了6种杀虫剂对香蕉花蓟马成虫和若虫的室内毒力研究。结果表明,药剂处理24 h后,毒死蜱、吡虫啉、阿维菌素、甲氨基阿维菌素苯甲酸盐、高效氯氰菊酯和啶虫咪对香蕉花蓟马成虫的LC50值分别为0.57 mg/L、0.86 mg/L、0.98 mg/L、1.57 mg/L、1.66 mg/L和13.48 mg/L,对香蕉花蓟马若虫的LC50值为分别为0.57 mg/L、0.81 mg/L、1.03 mg/L、1.79 mg/L、1.96 mg/L和33.45 mg/L。6种杀虫剂中毒死蜱、吡虫啉和阿维菌素对香蕉花蓟马具有较好的防治效果。 相似文献
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为有效防控云南茶树重要的食叶性害虫茶谷蛾(Agriophara rhombata),筛选防治茶谷蛾的适用药及适用量,指导科学用药。在室内采用浸叶法测定24~96 h 4种不同稀释倍数杀虫剂对茶谷蛾3龄幼虫的毒力作用。结果表明,4种化学杀虫剂对3龄茶谷蛾幼虫的毒力作用由强到弱表现为:24~72 h时,6%乙基多杀菌素悬浮剂(SC)>15%茚虫威乳油(EC)>15%唑虫酰胺SC>24%虫螨腈SC;96 h时,6%乙基多杀菌素SC>24%虫螨腈SC>15%茚虫威EC>15%唑虫酰胺SC。6%乙基多杀菌素SC与15%茚虫威EC具有较强毒杀力及速效性,可作为应急防治茶谷蛾的推荐药剂;24%虫螨腈SC发挥作用较缓,具有明显的时间—剂量—死亡率效应。研究结果可为云南茶区茶谷蛾的防治提供参考基础和依据。 相似文献
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介绍了运用冷冻干燥技术进行速溶蛋花汤的加工,研究了生产工艺、特点以及影响产品质量的主要因素。试验表明,采用冷冻干燥技术加工的速溶蛋花汤,具有营养丰富、风味独特、方便快捷等特点。 相似文献
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DENG Zhao-jing 《保鲜与加工》2005,(1):153-156
A new definition of inertia,i.e. the momentum is the measuring of inertia of matter, is proposed. The article through and etc., subjects, the correctness of the new notion of inertia:The monentum is the measuring of inertia has been demonstrated, and the unsolved contradictions of the traditional definition of inetia. And the mass is the measuring of inertia has been revealed. 相似文献
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香蕉是热带亚热带发展中国家重要的粮食作物和碳水化合物来源。但近年来,香蕉生产受到严重的病虫危害。大多数香蕉栽培品种是三倍体,生长周期长,而且不孕。由于没有种子,给繁殖和育种带来一定的困难。遗传转化技术的发展为香蕉品种的改良提供了一种有效的手段。香蕉的遗传转化方法有电激法、基因枪法、农杆菌介导法等。农杆菌介导法的应用是香蕉品种改良的一个重大突破。香蕉遗传转化的外植体也发展到多种,有原生质体,胚性细胞悬浮系,分生组织,以及横切薄片等。近几年,随着分子生物学的发展,出现了转化效率更高,重复性更好的香蕉遗传转化技术。如农杆菌和基因枪结合法,离心辅助农杆菌介导法、真空渗透技术等。这些新技术新方法的出现,必将推动香蕉产业高速发展。 相似文献
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基于RS与GIS技术,利用景观生态学理论及景观格局指数对布尔津县土地利用现状进行定量分析。结果显示为:(1)布尔津县以草地、林地为主要景观类型,镶嵌着耕地、水域等景观类型。(2)四个分区(即高山区、丘陵区、平原区、荒漠区)的林地资源组成差异明显,耕地、居民、交通及工矿用地集中分布在丘陵区和平原区(3)从各项指数来看,高山区的多样性指数较低;平原区是受人文因素最多的区域,景观优势度低,各种土地利用类型比例差异不大,有利于生态可持续发展,但要合理的开发利用;荒漠区生态环境相对脆弱,要加强生态环境的保护与改善。通过该研究对布尔津县的土地利用现状作一个了解,为该县乃至整个地区的景观规划和可持续发展战略提供科学依据。 相似文献
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Efficiency of water use of early plantings of sunflower 总被引:4,自引:0,他引:4
M. Auxiliadora Soriano Francisco Orgaz Francisco J. Villalobos Elías Fereres 《European Journal of Agronomy》2004,21(4):465-476
Rain fed crop production in Mediterranean environments depends to a large extent on strategies that avoid the intense summer drought. Early plantings of sunflower have given consistently higher yields in such environments, but the basis for such yield increases has not been explored. We conducted two field experiments at Cordoba (Spain) to investigate the effects of an early and a late planting date on the components of water-limited crop productivity; namely, water use (T), water use efficiency (TE) and harvest index (HI) of sunflower. The results were generalized by simulating rain fed sunflower yields, under early (1 January) and late (15 March) plantings, for a 25-year period with the aid of a simulation model of the Ceres type (OILCROP-SUN) which has been validated in Cordoba. Experimental seed yields of early plantings in 1989 and 1996 were 2.0 and 3.0 t ha−1, while late plantings yields were 1.3 and 2.4 t ha−1, for the 2 years. Average simulated yields were 2.7 ± 1.1 and 1.9 ± 0.7 t ha−1 for early and late plantings, respectively. For the 2 years, T of early plantings was higher than that of late plantings, but the response of TE and HI to planting date was not the same in the two experiments. In the simulation exercise, T and TE of early plantings were consistently higher than those of late plantings, while there were no differences in the HI for the two planting dates. We conclude that early plantings of sunflower increase rain fed yields by increasing both T and TE, while the impact of planting date on HI very much depends on the crop water stress pattern, which is quite variable from year to year even in the predictable Mediterranean environment. 相似文献
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The cotyledon and hypocotyl of eight varieties of alfalfa( Medicago sativa L. )are used to study the effect of different cultivation procedures and genotypes on embryogenic callus and embryoid induction,plant development and transplant of alfalfa.The varieties of alfalfa with high embryoid induction rate and high differentiation rate are screened. A high frequency regeneration system for alfalfa tissue culture is established:which is benifical to the gene transformation of alfalfa. 相似文献
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Based on the relation between the incipient yield pressure and the limit of yielding in cylinder according to the elastic disabled rule, a laboratorial method of determining limit of yielding of material is designed and a set of experimental data were gained by the method. The incipient yield pressure of the cylinder is gained by analyzing the experimental data, and then the limit of yielding is gained. The laboratorial method has a good reliability as the experimental value has a little error to the theory value. It has a definite engineering signification and theory value to research the mechanical capability of material and the disabled rule of high pressure vessel. 相似文献