Roda Amy, Nachman Gösta, Scheiner Katrina, Carrillo Daniel
United States Department of Agriculture APHIS-PPQ-S&T, Miami, FL, USA.
Department of Biology, Section of Ecology and Evolution, University of Copenhagen, Copenhagen, Denmark.
Exp Appl Acarol. 2024 Dec 12;94(1):9. doi: 10.1007/s10493-024-00970-z.
The flat mite, Brevipalpus yothersi (Baker, 1949) is widely distributed in the southern United States. This mite is associated with a citrus leprosis virus ((CiLV-C2) Cilevirus colombiaense strain hibiscus) infecting ornamental hibiscus (Hibiscus rosa-sinensis) in Florida and Hawaii. Because hibiscus is a highly traded ornamental plant, CiLV-C2 has the potential to spread. In laboratory experiments, the abundance and distribution of B. yothersi were studied on four varieties of tropical hibiscus. Plants, grown from cuttings, were infested with female mites, and held in environmental chambers (25 °C, 75% RH). After 3 months, the plants were divided into strata representing the top, middle and bottom of the plant. All mites (including eggs) found on the leaves and woody parts (main stems and side branches) were counted, and the surface area of each part calculated. The number and surface area of leaves and woody parts varied between hibiscus varieties; however, the differences between varieties with respect to total number of mites/plant and mites/cm were not statistically significant. There were twice as many mites on the woody parts than on the leaves. Most mites were found in the bottom stratum of the plants, and they showed an aggregated spatial distribution. The implications of mite distributions for assessing population sizes of B. yothersi were analyzed with the purpose of optimizing sampling without damaging the plant. The efficient sampling protocol developed is an important tool for managing the vector and thereby the disease.
扁螨，即约氏短须螨（Brevipalpus yothersi，Baker，1949），广泛分布于美国南部。这种螨虫与一种柑橘麻风病毒（柑橘麻风病毒C2型，即哥伦比亚病毒芙蓉毒株）有关，该病毒感染佛罗里达州和夏威夷州的观赏芙蓉（Hibiscus rosa-sinensis）。由于芙蓉是一种交易频繁的观赏植物，柑橘麻风病毒C2型有传播的潜在风险。在实验室实验中，研究了约氏短须螨在四种热带芙蓉品种上的数量和分布情况。通过扦插培育的植株被雌性螨虫侵染，并放置在环境箱中（25℃，相对湿度75%）。3个月后，将植株分为代表植株顶部、中部和底部的层次。对叶片和木质部分（主茎和侧枝）上发现的所有螨虫（包括卵）进行计数，并计算各部分的表面积。不同芙蓉品种的叶片和木质部分的数量和表面积各不相同；然而，不同品种在每株螨虫总数和每厘米螨虫数方面的差异无统计学意义。木质部分的螨虫数量是叶片上的两倍。大多数螨虫分布在植株的底部层次，且呈现聚集的空间分布。分析了螨虫分布对评估约氏短须螨种群数量的影响，目的是在不损害植株的情况下优化采样。所制定的高效采样方案是管理传播媒介进而防控该病害的重要工具。
