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《中国蚕业》2021,(1)
随着人们生活质量的提高,桑椹的价值越来越得到重视。桑椹菌核病是桑果生产中危害较为严重的真菌病害,为筛选安全高效的桑椹菌核病防治药剂,提高桑椹品质,采用生物制剂10.4%～11.8%脂肪酸乳油、6.5%茶黄素悬浮剂、木霉发酵液、6.5%茶黄素悬浮剂+木霉发酵液混合制剂及化学抗真菌药70%甲基硫菌灵可湿性粉剂与80%代森锰锌可湿性粉剂组合、430 g/L戊唑醇悬浮剂与30%吡唑醚菌酯悬浮剂组合进行防治对比试验,在桑树燕口期、始花期、盛花期、落花期进行防治,其中化学药剂在桑树落花期不用。试验结果表明,430 g/L戊唑醇悬浮剂与30%吡唑醚菌酯悬浮剂混合剂防治效果最好,校正防效达100%,70%甲基硫菌灵可湿性粉剂与80%代森锰锌可湿性粉剂组合防治效果次之,校正防效为93.93%;本次试验生物制剂防效普遍不如化学制剂,其中木霉发酵液防治效果最好,校正防效为68.22%。 相似文献
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桑椹菌核病是危害果桑的一种主要病害,严重影响桑椹的产量和品质,为筛选有效的预防和控制桑椹菌核病的药剂,用430 g/L戊唑醇悬浮剂、37%苯醚甲环唑水分散粒剂、70%甲基硫菌灵可湿性粉剂、50%腐霉利可湿性粉剂进行了防治试验,在桑椹采摘前25 d停止用药。试验结果表明,430 g/L戊唑醇悬浮剂3 000倍稀释药液的防治效果最好,校正防效达95.74%;37%苯醚甲环唑水分散粒剂3 000倍稀释药液的防治效果次之,校正防效为54.47%;70%甲基硫菌灵可湿性粉剂800倍稀释药液的防治效果较差,校正防效只有16.01%;50%腐霉利可湿性粉剂800倍稀释药液的防治效果最差,校正防效仅为11.19%。 相似文献
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调查了深圳市散尾葵植株上的褐圆盾蚧发生及危害情况,并测试了毒死蜱对褐圆盾蚧的防治效果。结果表明:散尾葵有虫株率为47.95%,虫害指数为63.99%。用40%毒死蜱乳油1000倍液进行防治试验,结果表明:虫口密度与防治效果呈明显的负相关关系,相关系数为r=-0.906 0,回归方程为y=0.846 1-0.005 8x,且防效偏低。按有效成分配置不同浓度毒死蜱进行防治试验发现试剂浓度与防效呈正相关关系,相关系数为r=0.982 6,回归方程为y=0.004 7x+0.163 6。当试剂浓度增加到0.635 0gm/L时,校正死亡率最大,为94.12%,证明40%毒死蜱乳油对高密度褐圆盾蚧会起亚致死量的作用。 相似文献
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调查了深圳市散尾葵植株上的褐圆盾蚧发生及危害情况,并测试了毒死蜱对褐圆盾蚧的防治效果。结果表明:散尾葵有虫株率为47.95%,虫害指数为63.99%。用40%毒死蜱乳油1000倍液进行防治试验,结果表明:虫口密度与防治效果呈明显的负相关关系,相关系数为r=-0.906 0,回归方程为y=0.846 1-0.005 8x,且防效偏低。按有效成分配置不同浓度毒死蜱进行防治试验发现试剂浓度与防效呈正相关关系,相关系数为r=0.982 6,回归方程为y=0.004 7x+0.163 6。当试剂浓度增加到0.635 0gm/L时,校正死亡率最大,为94.12%,证明40%毒死蜱乳油对高密度褐圆盾蚧会起亚致死量的作用。 相似文献
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本文通过室内生物活性测定和田间药效试验，评价了乙蒜素、丙森锌对柑桔虚幻球藻的防效。室内毒力测定结果表明：80%乙蒜素对柑桔虚幻球藻较敏感，其EC50为73.419 mg/L。田间药效试验结果表明：用乙蒜素防治柑桔虚幻球藻，速效性好，防效高。80%乙蒜素乳油1000倍液喷药一次，对柑桔虚幻球藻的防治效果达99.52%。而连续三次用药后，80%乙蒜素乳油2000倍液防治效果为98.31%，1000倍液防效达100%。70%丙森锌室内毒力测定对该菌不太敏感，田间防效仅为47.8%。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献