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乡村工业集聚具有一定的特征、类型、优势和缺点。因此,发展乡村工业应相应选择不同的政策。  相似文献   
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2014年美国新农业法案确定了后续5年(2014—2018年)的农产品出口促销项目,本文介绍了该法案下农产品出口促销项目的主要内容及资金安排。总体看,新农业法案下美国农产品出口促销项目基本保持稳定,同时根据WTO规则要求,取消了直接出口补贴,并对出口信贷担保项目的实施方式进行了调整。  相似文献   
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小规模的养猪场(少过50头的养猪业)是疾病的来源。虽然其数量正在迅速减少,但它们仍会在未来的几十年存在。因此,主要疾病仍将会在未来的几十年继续在中国呈现地方性流行。目前,东南亚面对的重要疾病包括口蹄疫(FMD)、蓝耳病(PRRS)、圆环病毒病(PCV2)、猪呼吸道疾病综合征(PRDC)、猪流行性腹泻(PED)、猪瘟(CSF)等。一、猪流行性腹泻它是由猪流行性腹泻病毒(PEDV)引起的。猪流行性腹泻病毒是冠状病毒属的单股正链RNA病毒。(一)临床症状易感猪群感染PEDV后容易暴发急性腹泻;母猪也可被PEDV感染,感染后表现  相似文献   
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There are several biopesticides based on entomopathogenic fungi available in the market for use against insect pests in greenhouse ecosystems.Although most are compatible for use with predators and parasitoids in greenhouse ecosystems,much more research is needed to determine the intraguild interactions for each combination of host, pathogen, predator, and parasitoid.Our research has demonstrated that, although direct effects on the predators could be demonstrated in laboratory bioassays, different results were found under greenhouse conditions, indicating that results obtained in the laboratory may be a poor predictor of what occurs in the greenhouse.In both cases, additive effects were obtained under greenhouse conditions,demonstrating compatibility. In addition, there is increasing evidence that entomopathogenic fungi have significant potential for dual management of invertebrate pests and plant pathogens.Our studies demonstrated that 3 species of Lecanicillium had significant effects on both aphids and cucumber powdery mildew, Sphaerotheca fuliginea;that the fungus Paecilomyces fumosoroseus was compatible with a mirid predator,Disyphus hesperus,when used concurrently against greenhouse whitefly,Trialeurodes vaporariorum;and that Lecaniciullium longisporum was compatible with a predatory midge,Aphidoletes aphidimyza when used concurrently against green peach aphids.  相似文献   
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