云南烟草丛枝症病害研究 V传染途径

在隔离环境中,按植物病毒学的标准程序,测试云南烟草丛枝症病害的传染途径,结果表明：云南烟草丛枝症病害具有广泛的传染途径,可以通过机械传染（嫁接、摩擦）和介体传染（菟丝子、蚜虫、烟盲蝽、叶蝉）等方式传播．     

Parasites of domestic and wild animals in South Africa. XIII. The seasonal incidence of adult ticks (Acarina: Ixodidae) on cattle in the Northern Transvaal.

Ticks were collected over a period of 13 months, at approximately fortnightly intervals, from 6 Africaner oxen kept on the farm Nylsvley in the Naboomspruit District. The 8 species of Ixodidae collected were, in order of abundance, Rhipicephalus appendiculatus, R. evertsi evertsi, Hyalomma marginatum rufipes, H. truncatum, Amblyomma hebraeum, R. simus, Boophilus decoloratus and Ixodes cavipalpus. The relative abundance of adult ticks of these species, their predilection feeding sites and seasonal fluctuations in numbers are discussed.     

蜂胶防治大田烟草病害效果试验

用蜂胶乙醇提取液对大田栽培的烟株进行病害防治的试验 ,结果表明 4种不同浓度的蜂胶对烟草病害均有防治作用 ,以原液稀释 50 0倍、 80 0倍防治效果最好。     

尼龙袋法评定鹿常用饲料的营养价值

用３头装有永久性瘤胃瘘管的成年公梅花鹿，采用尼龙袋法，评定了４９种７３个样品鹿常用饲料的干物质有效降解率（ＤＭＤ，下同），蛋白质有效降解率（ＣＰＤ，下同），有机物有效降解率（ＯＭＤ，下同）。结果表明，尼龙袋法能较好地评定梅花鹿饲料的ＤＭＤ、ＣＰＤ、ＯＭＤ和反映饲料品质差异；同类不同种饲料及同种饲料因收获期不同、处理不同、部位不同其ＤＭＤ、ＣＰＤ、ＯＭＤ差异较大；同种不同产地饲料间的ＤＭＤ、ＣＰＤ亦有差别。     

免疫调节剂与抗球虫药联合应用的抗球虫效果

为探讨免疫调节剂对鸡球虫病的免疫反应调节作用,设计并进行了免疫调节剂与抗球虫药合用的效果的研究。试验结果以抗球虫指数的测定来判定抗球虫药与免疫调节剂合用的效果。结果表明,免疫调节剂与抗球虫药合用状态下,抗球虫指数检测显示免疫调节剂卡介苗和黄芪多糖可明显提高抗球虫指数、改善球虫感染鸡的临床症、提高增重速度等,为控制球虫病提供了新的途径。     

化药防治羊硬蜱病试验

将1150只感染有草原革蜱和森林革蜱的绵羊分为3个组,分别为驱蜱项圈组（400只）、灭蜱灵组（550只）和对照组（200只）。项圈组在治疗后0、7、15、28、45、60、75、95天,羊只平均染蜱数分别为10.3、0.9、0.7、0.3、0.4、0.5、0.5、0.1只;而对照组分别为10.2、9.2、13.6、10、9.2、6.4、8.8、4.2只。灭蜱灵组在治疗后0、18、33、48、68天,羊只平均染蜱数分别为9.8、0.5、0.7、0.5、0.1只,而对照组分别为10、9.2、6.4、8.8、4.2只,表明两个防治组保护效果均较好。     

The life cycle of the two-host tick Rhipicephalus evertsi evertsi Neumann, 1897, under laboratory conditions (Acarina: Ixodidae)

The life cycle of Rhipicephalus evertsi evertsi Neumann, 1897, is discussed under the following headings: larval feeding; larval drop; nymphal feeding; nymphal drop; nymphal moulting; adult feeding; adult drop; preoviposition period; oviposition period and incubation. Special attention has also been given to the development of both male and female reproductive organs, gametogensis and mating.     

A rapid spectrophotometric method for the monitoring of embryonic development in ticks (Acarina: Ixodoidea).

A rapid spectrophotometric method for the monitoring of embryonic development in Boophilus decoloratus (Koch, 1844) is described. The method is based on a quantitative assessment of guanine, the prinicipal end-product of nitrogenous metabolism in ticks, which is gradually built up and stored in the rectal sac during embryonic development of the larvae. A study of the growth of tick embryos under constant temperature conditions and 6 different humidity conditions demonstrated that embryonic development was dependent on the water content of the eggs at the time of oviposition. When eggs lost more than 35% of their initial mass through evaporation, nitrogenous metabolism (as indicated by guanine production) was seriously affected and embryos died.