共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
3.
4.
温度对茶翅蝽沟卵蜂及其寄主卵发育的影响 总被引:2,自引:0,他引:2
茶翅蝽 [Halyomorphahalys(St l) ]在我国北方果区严重为害梨、苹果、山楂等果实 ,尤以梨受害最重[1] 。茶翅蝽卵往往被黑卵蜂属 (Telenomus)和沟卵蜂属 (Trissolcus)的寄生蜂寄生。我们在研究中发现了寄生于茶翅蝽卵的一种沟卵蜂 ,经鉴定为 1新种———茶翅蝽沟卵蜂(TrissolcushalyomorphaeYang) [2 ] 。茶翅蝽沟卵蜂属于膜翅目 (Hymenoptera)、黑卵蜂科 (Sce lionidae)、沟卵蜂属 ,是茶翅蝽卵的单性内寄生蜂。田间调查表明 :该蜂对第 2代茶翅蝽卵有明显的自然控制作用 ,最高寄生率接近 80 % (待发表 ) ,是一种很有利用价值的寄生性天… 相似文献
5.
6.
《植物保护》2001,(6)
虫 害都兰地区青稞、春小麦上麦水蝇的发生及防治 ………陈志国 ,郜和臣 ,吴昆仑 ,等 (2 - 2 4)……………………不同小麦品种 (系 )对小麦吸浆虫田间抗性鉴定 ………李素娟 ,刘爱芝 ,武予清 ,等 (3- 19)……………………两种麦蚜对杀虫剂的敏感性测定 ………………………刘爱芝 ,茹桃勤 ,王晓军 ,等 (5 - 2 0 )……………………粘虫半人工饲料的初步研究 ……………………………朱丽梅 ,倪玉萍 ,黄春霞 ,等 (6 - 2 7)……………………稻象甲发生危害及防治王德好 (1- 2 3)……………………1998~ 1999年六 (4 )代稻纵卷叶螟重… 相似文献
7.
8.
《昆虫天敌》2002,(4)
研究报告植物乙醇提取物对美洲斑潜蝇寄生性天敌的影响冼继东 詹根祥 曾玲等 (1 ) :1 -6…………………………………………………菟丝子致死薇甘菊韩诗畴 李开煌 罗莉芬等 (1 ) :7-1 4………………………………Bt对小地老虎呼吸作用的影响李芳 谌建春 陈家骅等 (1 ) :1 5-1 9…………………应用赤眼蜂携带病毒防治棉铃虫的初步研究朱景全 雷朝亮 彭辉银等 (1 ) 2 0 -2 5………………………………………………荔枝、龙眼园使用机油乳剂的安全性及其对荔枝蒂蛀虫的防治研究杨平 熊锦君 刘德广等 (1 ) :2 6-3 1………………………… 相似文献
9.
10.
为进一步优化赤眼蜂田间释放技术,提高松毛虫赤眼蜂对棉铃虫的田间防治效果,本文开展了棉龄虫卵龄和密度对松毛虫赤眼蜂寄生效能影响的研究。结果表明,松毛虫赤眼蜂对棉铃虫1~2日龄卵偏好性明显高于0~1日龄和2~3日龄卵。不同“蜂-卵”比结果表明,随着“蜂-卵”比值增加,赤眼蜂单蜂寄生效能逐渐下降,从14.33粒/蜂降至0.73粒/蜂,而棉铃虫卵被寄生率逐渐上升,从17.92%上升至73.33%。综合两者的关系,发现在“蜂-卵”比为1∶20时,两者出现了交汇,此时,赤眼蜂单蜂寄生效能约7.50粒/蜂,棉铃虫卵被寄生率约为37%。基于此,得出松毛虫赤眼蜂对棉铃虫的田间防治应综合“蜂-卵”比、田间棉铃虫种群密度及落卵量等指标来确定田间释放赤眼蜂数量,以达到棉铃虫田间最佳防治效果。 相似文献
11.
E. LIMPERT B. C. CLIFFORD A. DREISEITL R. JOHNSON K. MÜLLER A. ROELFS C. WELLINGS 《EPPO Bulletin》1994,24(1):109-112
A variety of systems of designation has evolved to name pathotypes of plant pathogens. The systems were evaluated to determine those best suited for particular purposes. Virulence and avirulence/virulence formulae of pathotypes have advantage over the use of consecutive numbers or letters given in chronological order of pathotype discovery. As soon as pathotype information exceeds a certain level of complexity, mathematical codes are most advantageous, in particular two codes, octal notation and coded triplets. A more universal adoption of the most appropriate codes is recommended to ease communication and comparisons of results. 相似文献
12.
Christopher D. Keating Lindy M. Holden-Dye Robert J. Walker 《Pest management science》1996,46(3):263-266
The neuropeptide AF2 has a complex set of actions on the dorsal muscle strip of Ascaris suum, including a potentiation of the acetylcholine-stimulated muscle contraction. Caffeine at 100 μm and 5 mm inhibited this potentiation, as did 100 μm theophylline in two out of six studies. The cyclic-AMP-potentiating compounds IBMX, dibutyryl cAMP and forskolin had no effect on the AF2-induced potentiation of the acetylcholine-stimulated muscle contraction. These preliminary data suggest that the potentiating action of AF2 is not mediated by a cAMP pathway. 相似文献
13.
福寿螺配偶个体大小选择性初步观察 总被引:7,自引:0,他引:7
通过野外观察与实验研究,掌握了福寿螺的婚配体制及其配偶选择性规律。福寿螺与多数低等动物一样,其婚配属于乱交制,无固定配偶;雌螺对与其交配的雄螺个体大小没有选择性,而雄螺对雌螺的个体大小有选择性,倾向于与较大个的雌螺交配。 相似文献
14.
F.M. Ashton O.T. de Villiers R.K. Glenn W.B. Duke 《Pesticide biochemistry and physiology》1977,7(2):122-141
Time- and concentration-course studies were conducted to determine the effect of thirteen herbicides on photosynthesis, respiration, RNA synthesis, protein synthesis, and lipid synthesis using isolated single leaf cells. Each herbicide was from a different chemical class. Appropriate 14C-substrates and product purification procedures were used for each process prior to liquid scintillation counting. The most sensitive metabolic site of inhibition was photosynthesis for atrazine, bromacil, dichlobenil, monuron, and paraquat; RNA synthesis for dalapon and dinoseb; protein synthesis for chlorpropham; and lipid synthesis for CDAA, chloramben, 2,4-D, EPTC, and trifluralin. However, with several herbicides, one or more process was almost as sensitive as the one mentioned above. All herbicides inhibited more than one process, and the most sensitive site of inhibition may not be the same process that was inhibited the greatest at the maximum concentration and maximum exposure time used. Therefore, a concept of metabolic sites of action, rather than a primary site of action, appears to be more meaningful for herbicides. 相似文献
15.
16.
Effects of timing and method of application of Penicillium oxalicum on efficacy and duration of control of Fusarium wilt of tomato 总被引:3,自引:0,他引:3
The effects of timing and method of application of Penicillium oxalicum on the control of fusarium wilt of tomato were investigated. Application of P. oxalicum to tomato seedlings in seedbeds reduced disease caused by Fusarium oxysporum f.sp. lycopersici in a growth chamber by 45–49% and in glasshouse experiments by 22–69%. Disease suppression was maintained for 60–100 days after inoculation with the pathogen in the glasshouse. No disease reduction was observed in tomato plants where P. oxalicum was applied to seeds. Treatment with P. oxalicum did not affect the population of F. oxysporum f.sp. lycopersici in the rhizosphere. 相似文献
17.
18.
为了研究青稞种子外部和内部携带真菌情况,比较不同杀菌剂对青稞种子的带菌消毒效果和对幼苗生长的影响,为青稞种子播前包衣处理和种传真菌病害防控提供依据,采用离体平皿法对云南迪庆‘云青1号’、‘云青2号’和‘短白青稞’3个主栽品种进行带菌检测,并对种子进行拌种或浸种处理测定6种杀菌剂对种子消毒效果,分析杀菌剂对种子发芽和幼苗生长的影响。结果表明:供试青稞种子表面携带的优势菌群为青霉(Penicilliumspp.)、镰刀菌(Fusariumspp.);种子内部寄藏的真菌主要为镰刀菌、核腔菌(Pyrenophoraspp.)、附球菌(Epicoccumspp.)、丝核菌(Rhizoctoniaspp.)、链格孢(Alternariaspp.)和木霉(Trichoderma spp.)。青稞不同品种的种子表面及内部携带的真菌种类差异较大。致病性测定表明,镰刀菌对种子萌发和幼苗生长影响最大,后期出现幼苗坏死现象。45%咪鲜胺EW、75%百菌清WP、50%福美双WP对青稞种子携带真菌均有显著抑制作用和消毒效果,50%福美双WP消毒效果最优,达100%;45%咪鲜胺EW、75%百菌清WP、50%福美双WP处理对青稞种子发芽和幼苗生长均无显著影响。 相似文献
19.
棉花黄萎病菌致病型的AFLP分析 总被引:16,自引:0,他引:16
选用41个棉花黄萎病菌(Verticillium dahliae)代表菌系,在温室条件下,对4个棉花品种鄂荆1号(感)、中棉所12(耐)、文-5(抗)和唐棉2号(抗)进行致病性测定,结果可将供试菌系分为落叶型与非落叶型2类。选取8对AFLP引物PCR扩增的结果中,统计带型稳定、清晰且有多态性的条带,共169条作系统聚类分析,将上述菌系分为2大类,第一类为非落叶型菌系,包括10个非落叶型菌系和1个过渡菌系;第二类为30个落叶型菌系。根据聚类分析建立树状图,发现菌系与地理来源存在一定的相关性,而依据菌系致病力强弱分类则相关关系不大。选用25对EcoRⅠ和MseⅠ引物组合,对供试的41个V.dahliae进行AFLP扩增,筛选到2对引物E64(GACTGCGTACCAATTCGAC)、M53(GATGAGTCCTGAGTAACCG)和E49(GACTGCGTACCAATTCCAG)、M65(GAT-GAGTCCTGAGTAAGAG),能分别扩增出433bp和110bp2条仅为V.dahliae非落叶型菌系独有的特异片段,可将落叶型与非落叶型菌系分开,这2条特异片段被命名为EM433和EM110。 相似文献