The exotic leaf mite Schizotetranychus krungthepensis Naing & Auger (Acarina: Tetranychidae), recorded on sugarcane in Thailand in 2014, began appearing on sugarcane in different states of India recently. Its occurrence in a severe form was noticed in sugarcane germplasm being maintained at the ICAR-Sugarcane Breeding Institute Research Centre, Kannur, Kerala State, during April–December in 2016 and 2017. The incidence of the mite was assessed in the International Society of Sugar Cane Technologists (ISSCT) collection of Saccharum spontaneum L. accessions (79) and Indian hybrids (260). In S. spontaneum, infestation rate (cane basis) was the lowest (66.67%) in IS 76–151. Intensity of attack (leaf basis) was the lowest (42.48%) in IS 76–164 and highest (99.28%) in SH 61-4-1 with infestation index ranging from 42.48 to 99.28. On the basis of infestation index, 76 out of 79 accessions (96.2%) were highly susceptible, three (3.8%) moderately susceptible and none least susceptible. In Indian hybrids, mite infestation ranged 1.8–100.0%; more than 60.0% accessions showed >50.0% infestation rate. Recently developed Indian hybrids showed a maximum of 20 web rows/leaf and more than 1000 webs/leaf which, however, did not differ significantly among the hybrids. Infestation parameters in the germplasm examined were not influenced by quantitative and qualitative morphological characters. A method developed to assess leaf damage from web density and mean web area indicated an approximate 11.79% leaf area loss due to the mite. Resistant sources thus identified from both S. spontaneum and Indian hybrids would be useful for introgression to evolve hybrids with mite resistance.

2014年在泰国的甘蔗上录制的异国叶螨Schizotetranychus krungthepensis Naing＆Auger（（螨：Tetranychidae）最近在印度不同州的甘蔗上出现。在2016年和2017年4月至12月期间，喀拉拉邦坎那尔市ICAR甘蔗育种研究所研究中心维护的甘蔗种质中发现了其严重的形式。螨虫的发生率是由国际糖业协会评估的甘蔗技术人员（ISSCT）收集了自发糖酵母（79）和印度杂种（260）。在自发链球菌中，在IS 76-151中，病虫害发生率（以甘蔗为基准）最低（66.67％）。侵袭强度（以叶为单位）在IS 76–164中最低（42.48％），在SH 61-4-1中最高（99.28％），侵染指数范围为42.48至99.28。根据感染指数，在79个种质中，有76种（96.2％）是高度敏感的，3个（3.8％）中度是敏感的，最不敏感的。在印度杂种中，螨虫侵扰率为1.8-100.0％。超过60.0％的种质表明侵染率> 50.0％。最近开发的印度杂种显示出最多20个网排/叶和1000个以上的网/叶，但是，这些杂种之间没有显着差异。受检种质中的侵染参数不受定量和定性形态特征的影响。开发了一种通过网密度和平均网面积评估叶片损伤的方法，该方法表明由于螨虫造成的叶片面积损失约为11.79％。因此从两个方面确定了抗药性来源自发链球菌和印度杂种将有助于渗入进化出具有抗螨性的杂种。