Cocoa is a commercially important beverage crop that faces new challenges in the context of climate change, which can alter pest and disease dynamics in cocoa plantations. In the Dakshina Kannada district of Karnataka, India, an abrupt increase in cocoa wilt was observed during the 2017–18 and 2018–19 seasons. Systematic examination of affected trees revealed consistent attacks of (Schedl, 1951; Coleoptera: Curculionidae: Scolytinae). In-depth studies of the wilted trees revealed the association of the plant pathogenic fungus sp. with . The identity of the obtained pure culture from the insect and infected tree was confirmed as sp. using amplification of ribosomal DNA, RNA polymerase II largest subunit () and translation elongation factor 1 () genes. Notably, this study reports a remarkable case of mutualistic association between ambrosia beetles and sp., belonging to the species complex (FSSC), rather than the (AFC). This finding highlights the intriguing diversity of mutualistic relationships in nature and sheds new light on the complex interactions between organisms. The present study also investigated the impact of rainfall on the colonization and spread of the complex. The findings revealed that rainfall was identified as a predisposing factor for the incidence and spread of attacks. Additionally, the study conducted a comprehensive analysis of the modeling of complex spread over a specific period of time.

中文翻译：

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Euwallacea perbrevis (Schedl, 1951) 和相关新型真菌共生体 Fusarium sp.：印度可可可可枯萎的潜在原因


可可是一种重要的商业饮料作物，在气候变化的背景下面临着新的挑战，这可能会改变可可种植园的病虫害动态。在印度卡纳塔克邦的 Dakshina Kannada 地区，2017-18 和 2018-19 产季期间可可枯萎病急剧增加。对受影响树木的系统检查显示出一致的攻击（Schedl，1951；鞘翅目：象甲科：小蜂亚科）。对枯萎树木的深入研究揭示了植物病原真菌的关联。和 。从昆虫和受感染的树中获得的纯培养物的身份被确认为 sp。使用核糖体 DNA、RNA 聚合酶 II 最大亚基 () 和翻译延伸因子 1 () 基因的扩增。值得注意的是，这项研究报告了豚草甲虫和属于物种复合体（FSSC）而不是（AFC）的物种之间存在共生关联的显着案例。这一发现凸显了自然界中互惠关系的有趣多样性，并为生物体之间复杂的相互作用提供了新的线索。本研究还调查了降雨对复合体定殖和传播的影响。研究结果显示，降雨被认为是袭击发生和蔓延的诱发因素。此外，该研究还对特定时间段内复杂传播的建模进行了全面分析。