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(一)二化螟在江西的分布情况,根据三年来的考察,在比例上较三化螟有逐渐扩展的趋势。此项原因,与江西三年来厉行三耕的结果是分不开的。因三耕后,三化螟大部死亡,二化螟则在越冬期中的顽强性大,能逃逸到其他杂草根部去躲藏,所以死亡率不高。 (二)同地区二化螟的分布密度,常因水稻品种的不同、栽培制度的不同、早晚稻的不同、以及周围有无菱白而发生差异。一般糯稻与粳稻中的二化螟分布密度,较高于籼稻;一季晚籼和一季晚糯的二化螟数目,又高于二季晚籼;早稻枯心苗中极少三化螟,晚稻枯心苗中渐多,到晚稻遗株中,则又往往超过了二化螟而占优势。 (三)菱白为二化螟及大螟的越冬大本营,能提早该地区二化螟第一代幼虫的发生期,增加该地区二化螟发生化数,又能使周围水稻田中,二化螟的数量增多,故稻区最好不种菱白。如果一定要种,则必须注意处理它的越冬遗株。处理的方法,根据二化螟及大螟在越冬前后部位的转移情形,抓紧在10月底前或5月底后,将菱白地上部位齐泥割去,深埋土下,或晒乾烧去,即可免其变蛹羽化,继续加害。
(A) of the distribution of stem borer in Jiangxi Province, according to the inspection of three years, in proportion to the three stem borer has a gradual expansion trend. The reason for this is that it is inseparable from the result of practicing three farming in Jiangxi in the past three years. After three tillage, most of the three borer died, borer in the wintering stubborn, can escape to other weeds to hide, so the mortality rate is not high. (B) the distribution of stem borer in the same area, often due to the different rice varieties, different cultivation systems, the difference between morning and evening rice, and whether there is no difference around the white rhomb. The distribution density of Chilo suppressalis in general glutinous rice and japonica rice is higher than that in indica rice. The numbers of late rice in late season and late season in late season are higher than late season indica rice in late season; Heart seedlings more, to late rice strain, they often exceed the stem borer and dominant. (C) Lingbai as Sesamia inferens and Sesamia in winter camp, can be the early stage of the occurrence of Chilo suppressalis larvae in the region, increasing the occurrence of Chilo suppressalis in the area, but also around the paddy fields, two of the Increasing the number of moths, it is best not to paddy Ling Ling white rice. If you must be kind, you must pay attention to handling its wintering inheritance. Treatment method, according to the stem borer and Sesamia in the winter before and after the transfer of parts of the site, pay close attention before the end of October or after the end of May, the mud cut off the upper part of Lingbai, buried under the earth, or dried to burn, You can avoid its become pupae eclosion, continue to damage.