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首页> 外文期刊>Australasian Plant Pathology >Role of beetles (Coleoptera : Scolytidae and Nitidulidae) in the spread of Phytophthora palmivora pod rot of cocoa in Papua New Guinea
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Role of beetles (Coleoptera : Scolytidae and Nitidulidae) in the spread of Phytophthora palmivora pod rot of cocoa in Papua New Guinea

机译：甲虫（鞘翅目：Scolytidae和Nitidulidae）在巴布亚新几内亚的可可疫霉（Phytophthora palmivora）豆荚腐烂传播中的作用

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摘要

This study was initiated after pod-boring beetles (Coleoptera: Scolytidae and Nitidulidae) were seen to preferentially colonise cocoa pod lesions caused by Phytophthora palmivora. We hypothesised that these beetles, which colonise discarded pod cases and infected pods, are an important and previously unrecognised vector of the black pod pathogen, P. palmivora, in cocoa plantations. Beetles colonise lesions within 24 h of their appearance, and the number of holes increases as the lesion expands. Beetles captured from naturally infected pod lesions carry viable pathogen propagules on their bodies. Frass residues on the surface of infected, colonised pods are rich in viable pathogen propagules. Contact insecticides significantly reduce both the number of beetle holes and the number of black pod lesions developing on pods, both in the field and under experimental conditions that exclude all sources of inoculum other than that carried by flying beetles. Beetles are attracted to disease lesions and rapidly generate and disseminate secondary inoculum in epidemics of pod rot, and their role must be included in any integrated disease management strategy.
机译：这项研究是在荚果甲虫（鞘翅目：Scolytidae和Nitidulidae）优先定殖由棕榈疫霉菌引起的可可荚病害之后开始的。我们假设这些甲虫定居在废弃的荚果盒和受感染的荚果中，是可可种植园中黑荚果病原体P. palmivora的重要且以前未被认识的载体。甲虫在出现后的24小时内定植在病灶中，并且随着病灶的扩大，孔的数量增加。从自然感染的荚果病变中捕获的甲虫在其体内携带有活力的病原体繁殖体。被感染的定殖豆荚表面上的弗拉斯残渣中富含可行的病原体繁殖体。在田间和实验条件下，接触性杀虫剂可显着减少甲虫孔的数量和在荚果上发展的黑荚病病灶的数量，这些条件排除了除飞行甲虫携带的所有接种源以外的所有接种源。甲虫被病虫害吸引，并在荚果腐烂的流行病中迅速产生并传播次生接种物，它们的作用必须纳入任何综合疾病管理策略中。

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