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常见的植物病原细菌有哪几个属?简述细菌病害的症状与诊断。...
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以下哪项不符合天牛的生物学特性?()A、离蛹B、幼虫无足型C、全变态D、孤雌生殖...
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波尔多液属于()A、保护剂B、治疗剂C、有机杀菌剂D、植物源杀菌剂...
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引起花卉病害的原因称为()A、寄主B、病原C、真菌D、细菌...
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苗期病害是播种或扦插繁殖幼苗时常见的病害,一般在出苗后哪一阶段内发生最严重?()A、5-10天B、10-15天C、10-30天D、30天以后...
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何谓有害生物综合治理(IPM)和全部种群治理(TPM)?有害生物综合治理的理论基础和指导原则是什么?...
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