Aphids are one of the most serious pests of crops worldwide, causing major yield and economic losses. To control aphids, natural enemies could be an option but their efficacy is sometimes limited by their dispersal in natural environment. Here we report the first isolation of a bacterium from the pea aphid Acyrthosiphon pisum honeydew, Staphylococcus sciuri, which acts as a kairomone enhancing the efficiency of aphid natural enemies. Our findings represent the first case of a host-associated bacterium driving prey location and ovipositional preference for the natural enemy. We show that this bacterium has a key role in tritrophic interactions because it is the direct source of volatiles used to locate prey. Some specific semiochemicals produced by S. sciuri were also identified as significant attractants and ovipositional stimulants. The use of this host-associated bacterium could certainly provide a novel approach to control aphids in field and greenhouse systems.
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机译:蚜虫是全世界农作物中最严重的害虫之一,造成大量的产量和经济损失。为了控制蚜虫,可以选择天敌,但有时其功效会受到其在自然环境中散布的限制。在这里,我们报道了从豌豆蚜虫豌豆蚜虫甘露葡萄菌中首次分离出一种细菌,该菌充当一种可乐满酮,可增强蚜虫天敌的效率。我们的发现代表了宿主相关细菌驱动猎物位置和对天敌的产卵偏爱的第一例。我们表明,该细菌在三营养相互作用中具有关键作用,因为它是用于定位猎物的挥发物的直接来源。 S. sciuri生产的一些特定的化学信息素也被认为是重要的引诱剂和产卵兴奋剂。这种与宿主相关的细菌的使用肯定可以提供一种控制田间和温室系统中蚜虫的新方法。
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