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桑天牛又名褐天牛,俗名水牛,在豫西苹果产区,发生普遍,是导致树体枝干残损的一种主要天牛害虫。该虫两年发生一代,幼虫在枝干内过冬。6月中旬至8月中旬成虫发生,卵多产在直径2两厘米左右粗的枝干阳面,产卵前先在枝干上咬一“U”或“川”形产卵槽,然后在其中产卵一粒。10～15天孵出幼虫,顺枝条向下蛀食,每隔一定距离从枝条内虫道中向外蛀一排粪孔,随虫龄增大距离加长。于第三年5～6月间在枝干内化蛹,约经两周羽化成虫。根据其发生生长规
Morus alba, also known as brown bull, common name buffalo, occurred in the western part of the apple producing area in western Henan, is a major pest damage caused by branches of trees. The pest occurs in two generations and larvae winters in the branches. Adults from mid-June to mid-August occur eggs in the diameter of about two centimeters thick branches of the sun, before spawning in the branches of a bite a “U ” or , Then spawn a grain in it. Incubation larvae for 10 to 15 days, feeding along the branches downward, at regular intervals from the branches inside the worm out of a wormhole, with insect age increased distance longer. In the third year from May to June in the branches of pupation, eclosion about two weeks adult. According to its growth regulations