棉铃虫对拟除虫菊酯类杀虫剂抗性遗传力的分析   总被引：3，自引：5，他引：3  

茹李军  范贤林  卢美光  赵建周  魏岑 《植物保护学报》1997,24(4):356-360

采用域性状分析法,估算了棉铃虫对氰戊菊酯、三氟氯氰菊酯和溴氟菊酯的抗性现实遗传力,并对3种菊酯的抗性风险进行了评估。结果表明,棉铃虫对氰戊菊酯、三氟氯氰菊酯和溴氟菊酯的抗性现实遗传力分别为0.2027、0.1554和0.1084。假设田间种群的抗性现实遗传力为估算值的一半,杀死率为80％,预计抗性增长到10倍时,氰戊菊酯可使用14次,三氟氯氰菊酯可使用19次,溴氟菊酯可使用31次。三氟氯氰菊酯和溴氟菊酯的抗性风险明显低于氰戊菊酯;棉铃虫对含氟菊酯的抗性发展速度明显低于不含氟的菊酯。试验结果为实际应用提供了理论依据。  相似文献   

双季稻区稻水象甲的生物学特性研究   总被引：5，自引：0，他引：5  

林云彪  商晗武  吕劳富  李先南  顾云琴  黄贤华  董向阳 《植物保护》1997,23(6):8-11

稻水象甲在浙江双季稻区每年发生２代，以成虫滞育越冬。春季越冬成虫迁入早稻田繁殖，形成１代致害种群；夏季１代成虫生殖滞育，绝大部分个体（９５％以上）迁出早稻田行夏蛰并越冬；秋季２代成虫羽化后，大部分迁飞山上草地越冬。  相似文献   

利用寄生蜂控制斑潜蝇研究进展   总被引：2，自引：0，他引：2  

陆庆光 《中国植保导刊》1997,(6)

本文概述了世界上利用寄生蜂防治斑潜蝇的研究进展。首次简要报道了我国引进潜蝇姬小蜂的初步研究结果。  相似文献   

苏云金杆菌高效生产菌株的筛选   总被引：2，自引：0，他引：2  

马冬梅  钟启超 《昆虫天敌》1997,19(2):62-65

从灯蛾罹病死亡幼虫中分筛筛选出苏云金杆菌ＢａｃｉｌｌｕｓｔｈｕｒｉｎｇｉｅｎｓｉｓＳＢ－１菌株，从引进的Ｂ．ｔ．菌种中筛选出ＳＢ－８菌株。该两株菌经发酵试验，生产性能良好，对抗药性强的台湾、泰国和深圳品系的小菜蛾毒力较高。田间试验表明杀虫效果好。  相似文献   

不同施氮量对甜椒碳、氮营养分配的影响   总被引：6，自引：0，他引：6  

隋方功  吕银燕  王运华  周广胜  樗木直也 《园艺学报》2004,31(4):472-476

 通过水培试验，利用 N和”C双示踪技术研究了不同施氮量对甜椒结果期碳、氮营养分配的影响 结果表明：结果前期吸收的 N在低氮(NO3一N 2．5 mol·L～，NH4+一N 0．25 mol·L )营养处理下分配于果实中的比率高于中氮(NO；一N 5．0 mol·L～，NH —N 0．5 mol·L )和高氮(NO；一N 11．0 mol‘L～，NH4+一N 1．0 mol·L )营养处理。氮水平制约着 N在各器官中的分配和再运转，很少影响”C在器官间的分配，但却制约着”C的运转和再分配，表现为中氮营养最有利于 C向果实中的再运转。碳氮营养平衡有利于碳素向生殖器官的运转和积累，这是低氮营养产量前高后低，高氮营养产量前低后高，中氮营养前后期产量均较高的根本原因。  相似文献   

日光温室土壤盐分和养分的变化趋势   总被引：8，自引：0，他引：8  

吕福堂  司东霞  张秀省 《中国蔬菜》2004,1(3):14-16

对种植 1～ 8a的日光温室土壤盐分和养分进行了调查研究 ,结果表明 ,随着日光温室种植年限的延长 ,土壤可溶性盐、电导率、养分含量呈增加趋势 ,酸碱度 (pH)呈降低趋势 ,有机质含量增幅不大 ;土壤速效养分中硝态氮含量过高 ,速效磷含量也很丰富。最后提出了温室土壤培肥和管理措施。  相似文献   

世界葡萄抗寒育种的成就与展望   总被引：9，自引：1，他引：9  

刘军  王小伟  魏钦平  鲁韧强  高照全 《果树学报》2004,21(5):461-466

近2个世纪,通过选种和杂交育种,世界葡萄抗寒育种在抗寒性与果实优质性状的结合方面取得了突破,育成许多抗寒性极强(耐-30～-40℃低温)、品质优良的鲜食、酿酒和制汁品种。由于葡萄的抗寒性是受多基因控制的数量性状,杂交后代的抗寒性基本呈以亲中值为峰顶的正态分布,所以我国应积极引进这些品种,在华北、西北等葡萄主产区试验、推广露地越冬栽培的同时,利用它们与现有抗寒性较弱的主栽品种(抗寒性-15～-18℃)杂交,培育适合我国冬季气候条件的抗寒品种(抗寒性在-25℃左右),迅速提高我国葡萄抗寒育种水平。  相似文献   

无菌压缩空气在保鲜奶加工中的应用     

陆培琪 《乳业科学与技术》2004,27(2):55-56

本文介绍了无菌压缩空气在保鲜奶生产中的应用，并介绍了一套完整的无菌空气处理系统。  相似文献   

Material in the middle ear of dogs having magnetic resonance imaging for investigation of neurologic signs     

M. C. Owen  BVSC    C. R. Lamb  MA  VETMB    D. Lu  BVET. MED.  MVM    M. P. Targett  BA  VETMB  PHD 《Veterinary radiology & ultrasound》2004,45(2):149-155

The aim of this study was to determine the prevalence and potential significance of finding material in the middle ear of dogs having magnetic resonance (MR) imaging. Of 466 MR studies reviewed, an increased signal was identified in the tympanic bulla in 32 (7%) dogs. Cavalier King Charles spaniels, Cocker spaniels, Bulldogs, and Boxers were over-represented compared to the population of dogs having MR imaging. Five (16%) dogs had definite otitis media and one (3%) had a meningioma invading the middle ear. Of the remaining dogs, 13 (41%) had possible otitis media and 13 (41%) had neurologic conditions apparently unrelated to otitis media. The most common appearance of material in the middle ear was isointense in T1-weighted images and hyperintense in T2-weighted images. There was no apparent correlation between the signal characteristics of the material and the diagnosis. Enhanced signal after gadolinium administration was observed affecting the lining of the bulla in dogs with otitis media and in dogs with unrelated neurologic conditions. In dogs without clinical signs of otitis media, finding an increased signal in the middle ear during MR imaging may reflect subclinical otitis media or fluid accumulation unrelated to inflammation. Brachycephalic dogs may be predisposed to this condition.  相似文献   

Antiviral Effect of Saccharomyces cerevisiaeβ‐glucan to Swine Influenza Virus by Increased Production of Interferon‐γ and Nitric Oxide     

K. Jung  Y. Ha  S.‐K. Ha  D. U. Han  D.‐W. Kim  W. K. Moon  C. Chae 《Zoonoses and public health》2004,51(2):72-76

The aim of these experiments was to investigate the potential antiviral effect of Saccharomyces cerevisiaeβ‐glucan on the pneumonia induced by swine influenza virus (SIV). Forty colostrum‐deprived 5‐day‐old piglets were randomly divided into four groups of 10. The 20 pigs in groups 1 and 2 were administered Saccharomyces cerevisiaeβ‐glucan orally (50 mg/day/pig; En‐Bio Technology Co., Ltd) for 3 days before SIV infection and those in groups 3 and 4 were given culture medium/diluent alone. Groups 1 and 3 were inoculated intranasally with 3 ml of tissue culture fluid containing 2 × 10⁶ tissue culture infective doses 50% (TCID₅₀)/ml of SIV and those in groups 2 and 4 were exposed in the same manner to uninfected cell culture supernatant. The microscopic lung lesions induced by SIV infection (group 1 pigs) were significantly more severe than those induced by infection in animals pre‐administered β‐glucan (group 3) (P < 0.05). Significantly more SIV nucleic acid was detected in the lungs of pigs experimentally infected with SIV only (group 1) at 5, 7 and 10 days post‐inoculation (dpi) compared with lungs from pigs pre‐administered β‐glucan and infected with SIV (group 3) (P < 0.05). The concentrations of interferon‐γ (IFN‐γ) and nitric oxide (NO) in bronchoalveolar lavage fluid from pigs pre‐administered β‐glucan and infected with SIV (group 3) were significantly higher than for any other group at 7 and 10 dpi for IFN‐γ, and at 5, 7 and 10 dpi for NO (P < 0.05). Saccharomyces cerevisiaeβ‐glucan reduced the pulmonary lesion score and viral replication rate in SIV‐infected pigs. These findings support the potential application of β‐glucan as prophylactic/treatment agent in influenza virus infection.  相似文献