E. B. Kingsley-Umana, Uche Evarestus Asogwa, I. Mokwunye
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引用次数: 0
摘要
本研究旨在确定尼日利亚6个可可种植州的可可茎螟虫分布、爆发和对可可种植园的损害程度。从六个主要的可可州中各选出三个地方政府区域,并从每个地方政府区域选出三个农场。在每个农场中,随机选择100棵可可树,检查mymilelon的症状和危害。结果显示,2019年棉铃虫侵害率较2014年显著上升10% (p = 0.01, df = 1, F = 41.77)。结果表明,不同州的侵染程度存在显著差异。感染的症状包括出现进出孔、树木周围有木质渗出物、树叶变黄和变褐。棉铃虫侵染造成的危害主要有:被侵染树枝和树木的荚果脱落和树木死亡。实地观察清楚地表明,茎螟虫现在正在成为一个严重的问题,并在很大程度上限制了该地区的可可生产。现在是时候给予更多的关注害虫的生物学和管理。这是第一份详细描述尼日利亚可可茎蛀虫症状和危害的报告。
Outbreak, Distribution and Damage Characteristics of Cocoa Stem Borer, Eulophonotus myrmeleon Felder 1874 (Lepidoptera: Cossidae) in Major Cocoa Producing States in Nigeria
This study aims to ascertain the extent of the cocoa stem borer Eulophonotus myrmeleon distribution, outbreak, and damage to the cocoa plantations in six cocoa growing states in Nigeria. Three local government areas were selected from each of the six major cocoa states and three farms from each local government area. In each farm, 100 cocoa trees were randomly selected and in-spected for symptoms and damages of E. myrmeleon. The result revealed that E. myrmeleon infestation has increased significantly (p = 0.01, df = 1, F = 41.77) in 2019 by 10% from the 2014 inspection. It also showed that the infestation level was significantly different from state to state. Symptoms of infestation include presence of entry/exit holes, woody exudates around the trees, yellowing and browning of the leaves. Damages caused by E. myrmeleon infestation are, loses of pod on the affected branch and tree and death of tree. Field observations showed clearly that stem borer is now becoming a serious problem and limiting considerably the production of cocoa in the region. It is time to give more attention to the biology and management of the pest. This is the first report detailing the symptoms and damage done by cocoa stem borers in Nigeria.