广东省1970年开始试种杂交高粱。高粱芒蝇(Atherigona soccata Rondani)从1971年起逐渐成为杂交高粱的重要害虫,它分布全省各地区,有虫区内的高粱被害率轻者为1％以下,重者为20％,个别达90％以上。1973年,我们在台山县白沙公社朗北大队进行了初步研究。结合前两年的观察,今将有关资料整理如下。 一、为害和寄主 高梁芒蝇是高粱苗期的害虫。一般一株仅寄生一头,个别有两头。多在3—8片叶时为害,4—6片叶时最盛;从9片叶直至旗叶抽出也可受害。高粱受害的症状为:首先心叶叶片呈失水状,软化下垂;继而枯萎,俗称枯心苗。产生桔心的原因是幼虫从心叶基部环状咬断;生长点受损害,主茎停止生长,心叶片失去水分供应而枯萎。有4片全叶的植 Guangdong province began experimenting with hybrid sorghum in 1970. Since 1971, Atherigona soccata Rondani has gradually become an important pest of hybrid sorghum. It distributes in all regions of the province. The damage rate of sorghum in the insects is less than 1% and the weight is 20% More than 90. In 1973, we conducted a preliminary study on the Longbei Brigade in Baisha Commune, Taishan County. Combined with the previous two years of observation, the relevant information is now organized as follows. First, damage and host sorghum mangrove flies are pests in sorghum seedling stage. Usually only a parasitic head, each has two. Damaged more than 3-8 leaves, the most flourishing 4-6 leaves; leaves from the nine leaves until the flag leaves can also be harmed. The symptoms of sorghum victimization are as follows: First, the leaflets of the heart leaves are dehydrated and soften and droop; and then withered, commonly known as the dead heart seedlings. The reason for producing orange heart is that the larvae snap from the base of the heart ring; the growth point is damaged, the main stem stops growing, and the heart leaves lose water supply and wither. There are 4 whole leafy plants