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1964年10月上旬下半期到下旬初,在乐安县牛田公社种植的2500亩晚大豆(Glycine max(L.) Merr.)遭受到棉铃虫(Heliothis armigera Hubner)严重为害。据调查,百个豆荚有幼虫50-70头,被害后豆荚内无豆粒,均是空荚。据报导,棉铃虫在9月中旬到10月中旬幼虫要入土化蛹过冬,不再为害。但是去年,此时还继续发生原因何在?据笔者调查,邻近种了少量棉花,此时已经衰老变硬难以为害;在气候干旱、温度偏高、雨量稀少,可能适应它大量繁殖。因食料缺
2,500 acres of late-season soybean (Glycine max (L.) Merr.) Planted in Niutian commune, Le’an County was severely damaged by the Heliothis armigera Hubner from late October to early October 1964. According to the survey, one hundred pods have larvae 50-70, no peas inside the pods were killed, are empty pods. It is reported that the cotton bollworm in mid-September to mid-October larvae should be buried pupation winter, no longer harmful. However, last year, what happened at this time? According to the author’s survey, a small amount of cotton was planted nearby, which has become harder and harder at that time. In the case of arid climate, high temperature and scarce rainfall, it may be adapted to multiply. Due to lack of food