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首页> 外文期刊>Fruit, Vegetable and Cereal Science and Biotechnology >The Effect of Digging by the Colorado Potato Beetle (Leptinotarsa decemlineata) (Coleoptera: Chrysomelidae) on the Acquisition and Retention of Beauveria bassiana Conidia
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The Effect of Digging by the Colorado Potato Beetle (Leptinotarsa decemlineata) (Coleoptera: Chrysomelidae) on the Acquisition and Retention of Beauveria bassiana Conidia

机译：科罗拉多马铃薯甲虫（Leptinotarsa decemlineata）（鞘翅目：菊科）的挖掘对球孢白僵菌分生孢子的获取和保留的影响。

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摘要

The fungal pathogen, Beauveria bassiana, may play an important role in the management of overwintering Colorado potato beetles. Prediapause beetles dig into the soil in the fall where they overwinter. The loss or removal of conidia from the integumentduring the digging process may decrease the chance of disease development and subsequent mortality. We evaluated the number of fungal conidia that were acquired and retained by the beetle after burrowing into soil that was surface-treated with B. bassiana conidia. In addition, we evaluated beetles for disease initiation after exposure to conidia at the soil surface. Results showed that beetles acquired significant numbers of conidia from the surface treatment; however there was a linear decrease in thenumber of conidia retained on the integument as the beetles' burrowing depth increased. Almost half the population (54 and 46%) lost all conidia when the burrowing depth was between 21 and 30 cm. B. bassiana application method, spraying vs mixing conidia into the soil surface, did not significantly incite disease; however the inoculation concentration significantly affected mortality. More insects became infected when adults were exposed to surface concentrations of 10~7 compared to 10~6 conidia per cm~2. Fall application of B. bassiana to reduce overwintering populations may not be a viable option because beetles tend to lose the conidia that are acquired on the surface during digging, thus reducing the chances of disease occurring during the overwintering stage. Soil treatments in the spring may be more beneficial in reducing the Colorado potato beetle colonizing population.
机译：真菌病原球孢白僵菌可能在科罗拉多马铃薯甲虫越冬的处理中起重要作用。滞育前的甲虫在秋天越冬时会挖入土壤。在挖掘过程中，皮具中分生孢子的损失或去除可能会降低疾病发展和随后死亡的机会。我们在钻入经球孢白僵菌分生孢子表面处理过的土壤中后，评估了甲虫获取并保留的真菌分生孢子的数量。此外，我们评估了甲虫暴露于土壤表面的分生孢子后是否引发疾病。结果表明，甲虫从表面处理中获得了大量的分生孢子。然而，随着甲虫穴位深度的增加，保留在外皮上的分生孢子数量呈线性下降。当挖洞深度在21至30厘米之间时，几乎一半的人口（54％和46％）失去了所有分生孢子。 B. bassiana施用方法，将分生孢子喷雾与混合分生孢子喷施到土壤表面，并没有明显引发疾病。然而，接种浓度显着影响死亡率。当成年人暴露于10〜7的表面浓度时，更多的昆虫被感染，而每cm〜2的分生孢子为10〜6。秋季应用B. bassiana来减少越冬种群可能不是一个可行的选择，因为甲虫往往会失去挖掘过程中在表面上获得的分生孢子，从而减少了越冬阶段发生疾病的机会。春季土壤处理可能对减少科罗拉多马铃薯甲虫的定居种群更为有利。

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