论文部分内容阅读
用二面快口铡刀铡查越冬水稻螟虫虫口密度、化蛹进度,预测第一代发生期,通过十年实践,证明是代替手工剥查行之有效的方法。 越冬初期虫口密度的铡查 绿肥田 不同类型绿肥田,分田(土丘)五点或对角线、横方向直线随机取样,拔取或挖取稻根200只。 春花田 在一定面积,拾取外露稻根,采取铡查和有目的的剥查相结合,即可在田间记录结果。这里有几个关键问题分述于下: 1.工作时,以捏稻根的左手心对太阳为宜,以便观察稻草芯中的虫粪。捏稻根数以不脱落、充满一把为限,一般约3—5只,不可捏太紧,以免捏死虫蛹,不易辨认死活;也不可捏得太松,以防“皮刀”铡伤手掌或次倒稻根。长度以5—10毫米较好,过长易错过虫口,影
With two-sided quick trowel 铡 knife check 越 winter borer insect population density, pupation progress, predict the first generation, through decades of practice, proved to be an effective alternative to manual stripper method. In the early winter, the density of insect population is different from that of the green manure fields. Five sub-fields (mounds) or diagonal lines and horizontal straight lines are randomly sampled, and 200 rice roots are picked or dug. Spring flowers field in a certain area, pick up the exposed rice roots, check and check purposeful combination of check, you can record the results in the field. Here are a few key issues described in the following: 1 work, to pinch the root of the left hand heart of the sun is appropriate in order to observe the worm core in the straw. Pinch the number of rice does not fall off, full of a limited, usually about 3-5 only, can not pinch too tight, so as not to pinch the dead pupae, not easy to identify the life and death; can not be too loose to prevent the “skin knife” 铡Injury palms or subside rice roots. Length of 5-10 mm is better, too long to miss the mouth, shadow