禾茎广肩小蜂对爱达荷州四种天然禾草生长、繁殖的影响

• 作 者: Brian M.Spears Willian F.Barr 范京安
• 出 处: 四川草原
• 发表日期: 1986年03期
• 关键词: 小蜂 冠毛 针茅 Stipa 爱达荷州 三芒草 种子发芽率 对照区 第一叶 放牧管理

通过对禾茎广肩小蜂(Tetramesa Walk)幼虫食性的研究,测定了禾茎广肩小蜂对四种爱达荷州天然禾草的危害。由于该虫的危害,使得红三芒草(Aristialongiseta)、瓶刷细坦麦(Sitanion hy-strix)、沙鼠尾栗(Sporobolus crypt-andrus)和冠毛针茅(Stipa comata Trin and Rupr.)的生殖枝变短;同时,也使瓶刷细坦麦和冠毛针茅的花序的小穗数目减少;还使沙鼠尾栗的花序缩短。禾茎广肩小蜂使这四种禾草的籽粒重降低、种子发芽率下降。由于该虫对天然禾草的危害,显著地降低了草场的利用价值。因此,有必要控制其危害。

Through the study on the feeding habits of Tetramesa Walk larvae, the harm of four species of Idaho natural grasses to the grasshopper was determined. As a result of the pest’s danger, the Aristialongiseta, Sitanion hy-strix, Sporobolus crypt-andrus and Stipa comata Trin and Rupr. Reproductive branches shorter; at the same time, but also to bottle brush thin Tan and cut the number of spike head of inflorescences reduced; also shortened the inflorescence of tail hamster. The stem-stems and little-shouldered bees reduced the grain weight of the four grass species and the seed germination rate decreased. Due to the pest’s damage to natural grasses, the use value of pasture is significantly reduced. Therefore, it is necessary to control the harm.