Screening of field performance of entomopathogenic fungi and nematodes against cabbage root flies (Delia radicum l. and d. floralis (fall.); Diptera,Anthomyiidae)     

Irene Vänninen  Heikki Hokkanen  Johanna Tyni‐Juslin 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2013,63(3):167-183

Finnish isolates of Beauveria bassiana (8 isolates), Metarhizium anisopliae (7), Tolypocladium sp. (2), Paecilomyces farinosus (2), P. fumosoroseus (1), Steinernema feltiae (3) and Bacillus thuringiensis ('Muscabac') were tested for efficacy against mixed populations of Delia radicum and D. floralis under field conditions in 1986–90. All pathogens were applied preventatively, the fungi as aqueous conidial or mycelial suspensions, dry conidia or dry mycelial powder. In only two of the nine experiments did B. bassiana or M. anisopliae give some control. In 1986, B. bassiana SF85–2 and Tolypocladium sp. SF85–4 (both at rate 1.2 x 10⁹ conidia plant‐ 1), and ‘Muscabac’ (25 g 1^?1, 1 dl plant^?1) reduced the number of pupae by 80%, 60% and 50%, respectively, as compared with untreated and chemical (isophenphos) controls. In 1990, M. anisopliae SF86–39 at rate 1.6 x 10⁹conidia plant^?1 and 1.5 x 10⁸ CFU plant^?1 and S. feltiae SFS‐22 (35000 plant^?1), increased the yield of cauliflower 2.2, 1.8, and 2.3‐fold, respectively, as compared with the untreated control, but these yields were only 19%, 15% and 19% of those of the chemical (diazinon) control. Paecilomyces isolates were ineffective in the 1986 experiment in which they were included. Our results suggest that it is difficult to find efficient control agents among the fungal and nematode species tested for use as biopesticides against cabbage root flies, but that the potential of M. anisopliae against these pests deserves further study.  相似文献   

Estimating spatial distribution of Atlantic salmon escapement using redd counts despite changes over time in counting procedure: application to the Allier River population     

Guillaume J.R. Dauphin  Catherine Brugel  Marion Hoffmann‐Legrand  Etienne Prévost 《Ecology of Freshwater Fish》2013,22(4):626-636

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瘤胃缓释氮对奶牛泌乳性能的影响     

赵柳 《饲料与畜牧》2013,(7):16-17

试验旨在研究瘤胃缓释氮对奶牛泌乳性能的影响。选用胎次不同、产犊日期相近、泌乳中期的中国荷斯坦奶牛62头,随机分为两组(试验组和对照组),每组31头。试验前15d为预饲期。在预饲期内,试验组添加0.5%瘤胃缓释氮替代3%豆粕;到第16d添加1%瘤胃缓释氮替代6%豆粕;第38d添加1%瘤胃缓释氮替代6%的菜粕。结果表明,与对照组相比,试验组添加瘤胃缓释氮可提高奶牛对干物质的采食量,平均产奶量提高1.20kg,平均饲养成本降低0.33元/d,经济效益增加。  相似文献   

Theoretical analysis and finite element simulation of a rice kernel obliquely impacted by a threshing tooth     

Xu Lizhang  Li YaomingMa Zheng  Zhao ZhanWang Chenghong 《Biosystems Engineering》2013,114(2):146-156

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松节油及其组合对松墨天牛引诱效果比较     

伍苏然  张淑颖  熊国如  袁素蓉  董文霞  肖春 《西南农业学报》2013,26(2)

通过林间试验,比较了松节油与乙醇、苯乙醇、松油醇、糖酒醋液按不同比例组合而成的7种引诱剂(Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ、Ⅵ、Ⅶ)、2种成品引诱剂(Ⅷ、Ⅸ)对松墨天牛成虫的引诱效果.结果表明,松节油对松墨天牛有一定引诱作用(Ⅰ诱虫量2.4±0.92头,雌性比0.33±0.06).乙醇可显著增强松节油的引诱效果(Ⅴ诱虫量22.4±4.52头,Ⅲ雌性比0.57±0.04).苯乙醇、松油醇组合引诱剂对诱虫量无显著影响,但可显著提高诱雌能力(Ⅵ雌性比0.68±0.05).添加糖酒醋液显著降低了组合引诱剂的诱虫量(10.80土3.73头)及雌性比(0.26±0.10).组合引诱剂Ⅵ诱虫量(22.05±5.74头)显著高于成品引诱剂(Ⅷ、Ⅸ诱虫量分别为14.80±4.17、12.28±3.31头),雌性比(0.68±0.05)与引诱剂Ⅷ无差异,显著高于引诱剂Ⅸ(0.52±0.03) (P =0.05).  相似文献   

2010年1-9月陕西省饲料工业发展形势分析     

赵辉文  叶玲  鲁毅 《饲料广角》2010,(21):23-25

<正>今年前3季度,陕西省饲料工业克服了饲料原料价格高位振荡运行和生产成本剧增的困难,积极应对,加快调整产品结构,努力拓展新市场,有力助推了饲料工业持续稳定发展。1饲料工业发展基本情况1.1饲料生产连创新高,产量产值持续增长据统计,陕西省前3季度饲料工业总产量达276.9万t,实现饲料工业总产值88.6亿元,分别比上年同期总产量261.7万t和总产值83.5亿元增长5.81%和6.11%。  相似文献   

南昌市道路绿化树种调查分析与建议     

尤春波  陈卫军  章晴  李莲芳 《河南林业科技》2013,33(1):29-31,62

通过对南昌市道路主要绿化树种种类、使用频率及长势进行调查,并对存在的问题进行分析与探讨,同时根据南昌市的实际情况,提出了几点建议和措施。  相似文献   

Seroprevalence of chlamydial infection in dairy cattle in Guangzhou, southern China     

Dong-Hui Zhou  Fu-Rong Zhao  Hui-Yan Xia  Min-Jun Xu  Si-Yang Huang  Hui-Qun Song  Xing-Quan Zhu 《Irish veterinary journal》2013,66(1):1-4

Chlamydia spp. are obligate intracellular gram-negative bacteria that cause a wide range of significant diseases in humans and animals worldwide, resulting in significant economic losses. Chlamydial infection in cattle has been reported in many countries including China. However, there has been no survey of chlamydial infection of dairy cattle in Guangzhou, southern China. The objective of the present investigation was to examine the chlamydial seroprevalence in dairy cattle in Guangzhou, subtropical southern China by using an indirect hemagglutination assay (IHA). The overall seroprevalence of chlamydial infection in dairy cattle was 7.25% (29/400). Greater than or equal to eight-yr-old dairy cattle had the highest seroprevalence (10.34%), followed by those that were ≥ 6 years old or < 7 years old dairy cattle (10.20%), although there were no statistically significant differences among different groups (P > 0.05). Dairy cattle with 5 pregnancies had the highest seroprevalence (10.81%). These results indicate that chlamydial infection was present in dairy cattle in Guangzhou, subtropical southern China, and integrated strategies and measures should be executed to control and prevent chlamydial infection and disease outbreak in the study region.  相似文献   

浙江中华蜜蜂微卫星遗传多样性分析     

曹联飞  苏晓玲  赵东绪  华启云  胡福良 《中国蜂业》2013,(Z2):10-11

浙江是中华蜜蜂的传统饲养区,本研究对浙江中华蜜蜂的微卫星遗传多样性进行了初步分析。结果发现浙江中华蜜蜂的遗传多样性较低,因此有必要对其采取更加有效的保护措施。  相似文献   

浙江省中华蜜蜂形态特征研究     

赵东绪  苏晓玲  曹联飞  华启云  胡福良 《中国蜂业》2013,(Z2):4-9

选择浙江省12个样点36群中华蜜蜂样本,每群随机抽取15只工蜂,每只工蜂测定27项形态特征指标。利用SPSS16.0对形态特征数据进行因素分析、聚类分析和变异分析。结果表明:浙江省境内的中华蜜蜂存在较大的形态差异及种群分化。因素分析结果提取3个特征值高(>3)的因素,包括了63.798%的变异。利用提取的主因子进行聚类分析,分为4个类群:永康、义乌、金华、杭州和丽水的样本为第1类;长兴、黄岩、慈溪的样本为第2类;江山、嵊州和舟山的样本为第3类;苍南的样本与其他地区样本的遗传距离最远,单独为一类。变异分析结果显示:浙江省12个样点中华蜜蜂除后翅钩数样点间差异不显著(P>0.05)外,其余26项形态指标样点间差异较大。其中,舟山中华蜜蜂的翅长、翅宽、第3、4背板总长、第4、7腹板总长及腿相关4项指标平均值最大,与其余地区中华蜜蜂形态差异性较大;苍南中华蜜蜂的蜡镜长、蜡镜间距离和蜡镜斜长指标均值最大,与其它地区中华蜜蜂形态差异显著(P<0.05)。  相似文献