Qayyoum Muhammad Asif, Song Zi-Wei, Zhang Bao-Xin, Li Dun-Song, Khan Bilal Saeed
Guangdong Provincial Key Laboratory of High Technology for Plant Protection/Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou City, Guangdong, China.
Department of Plant Protection, Ghazi University, Dera Ghazi Khan, Dera Ghazi Khan, Punjab, Pakistan.
PeerJ. 2021 Apr 5;9:e10899. doi: 10.7717/peerj.10899. eCollection 2021.
(McGregor) (Acari: Tetranychidae) population outbreaks after the citrus plantation's chemical application is a common observation. Dispersal behavior is an essential tool to understand the secondary outbreak of population. Therefore, in the current study, the dispersal activity of was observed on the leaf surfaces of (Rutaceae) treated with SYP-9625, abamectin, vegetable oil, and EnSpray 99.
Mites were released on the first (apex) leaf of the plant (adaxial surface) and data were recorded after 24 h. The treated, untreated, and half-treated data were analyzed by combining the leaf surfaces (adaxial right, adaxial left, abaxial right, and abaxial left). All experiments were performed in open-air environmental conditions.
The maximum number of mites was captured on the un-treated or half-treated surfaces due to chemicals repellency. Chemical bioassays of the free-choice test showed that all treatments significantly increased the mortality of depending on application method and concentration. A significant number of mites repelled away from treated surfaces and within treated surfaces except adaxial left and abaxial right surfaces at LC. In the no-choice test, SYP-9625 gave maximum mortality and dispersal by oils than others. No significant differences were observed within the adaxial and abaxial except abaxial surface at LC. Therefore, the presence of tested acaricides interferes with dispersal within leaf surfaces of plantations depending on the mites released point and a preferred site for feeding.
（麦格雷戈叶螨）（蜱螨亚纲：叶螨科）在柑橘种植园施用化学药剂后种群爆发是常见现象。扩散行为是理解种群二次爆发的重要手段。因此，在本研究中，观察了麦格雷戈叶螨在经SYP - 9625、阿维菌素、植物油和EnSpray 99处理的柑橘（芸香科）叶片表面的扩散活动。
将叶螨放置在植株的第一片（顶端）叶片的正面，24小时后记录数据。通过合并叶片表面（正面右侧、正面左侧、背面右侧和背面左侧）对处理、未处理和半处理的数据进行分析。所有实验均在露天环境条件下进行。
由于化学药剂的驱避作用，在未处理或半处理的表面捕获到的叶螨数量最多。自由选择试验的化学生物测定表明，所有处理根据施用方法和浓度均显著提高了麦格雷戈叶螨的死亡率。在LC浓度下，大量叶螨从处理过的表面被驱离，并且在处理过的表面内，除了正面左侧和背面右侧表面外。在无选择试验中，SYP - 9625比其他药剂导致的死亡率和因油类引起的扩散率最高。在LC浓度下，除了背面表面外，正面和背面之间未观察到显著差异。因此，所测试杀螨剂的存在会干扰叶螨在种植园叶片表面的扩散，这取决于叶螨的释放点和取食的偏好位点。
