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甘薯天蛾又名旋花天蛾,是本地区间断性大害虫。常为人们所忽视,一到大发生年,出于不备的蒙受灾害,使薯叶全被吃光,减产甚巨。据当地群众说,此虫除1961年猖獗发生以外,1948年也曾成灾。为了摸清此虫在本地区的发生代数、时间以及各代与天敌之关系,供今后防治时的参考,我所于1962年对甘薯天蛾进行了初步观察,结果如下。 一、发生代数及时间 甘薯天蛾在襄北地区一年可发生三—四代,如为三代,主要是以第二代的部分蛹(占第二代总蛹数的46.6％)在土室内越冬。越冬代成虫5月上旬开始发生,中旬达产卵盛期,幼虫盛发期在5月下旬;第二代成虫8月上旬开始发生,卵于8月上旬初见,中旬达产卵盛期,幼虫发生盛期在8月中下旬;第三代成虫于9月中旬出现,此期由于气温渐低,幼虫生活期也相应延
Sweet potato moth also known as Convolvosa, is intermittent pests in the region. Often overlooked by people, one year to a big occurrence, out of unprepared disaster, the potato leaves are eaten, production is huge. According to local people, this worm was also plagued in 1948 in addition to the rampant 1961 epidemic. In order to find out the occurrence of algae in the region algebra, time and the relationship between generations and natural enemies, for future reference when I control, I conducted in 1962, the sweet potato thorn moth conducted a preliminary observation, the results are as follows. First, the occurrence of algebra and time Sweet potato thorn moth in northern Hubei can occur three to four generations a year, such as three generations, mainly in the second generation of part of the pupa (accounting for 46.6% of the second generation of the total number of pupae) within the soil Winter. The overwintering adults began to occur in early May, reached the peak in mid-laying, larvae Shengfa in late May; the second generation of adults began in early August, the eggs first saw in early August, reached the peak of egg production in the middle, The larvae peaked in late August; the third generation of adult worms appeared in mid-September, during which time the temperature gradually decreased, and the larvae lived correspondingly.