论文部分内容阅读
河北省植保植检站预计二代棉铃虫将中等发生,发生盛期比常年偏早2~5天左右。主要依据:(1)麦田残虫量高。一代麦田个别地块虫量偏高,是近几年发生密度较高年份,沧县调查最高6~9头/m2。5月28日至6月1日全省普查,麦田一代残虫全省平均0.1062头/m2,是上年的2倍,残虫数量在近几年中仅略低
Plant protection and phytosanitary station in Hebei Province is expected to second-generation cotton bollworm will occur moderately, the occurrence of peak than usual 2 to 5 days or so. Main basis: (1) wheat field of high amount of residual worms. A single generation of high-density wheat in individual plots, is the occurrence of high density in recent years, the highest Cangxian survey 6 ~ 9 / m2. May 28 to June 1 provincial census, a generation of wheat field An average of 0.1062 heads / m2, which is twice of the previous year, and the number of the beetles is only slightly lower in recent years