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晚稻麻壳现象近年来在我县日益加重。过去我们认为这是由于寒潮和病害造成的。通过反复调查,发现稻蓟马为害晚稻花器,也能造成大量的空壳。一、蓟马种类:几年来我们对地处海拔300—800米的沅古坪山区进行了一系列调查,先后剥检了24,200多粒晚稻(包括一季晚稻)谷壳,查明蓟马种类主要是稻管蓟马(禾谷蓟马),占75.9％,其次是稻蓟马,占24.1％。二、为害过程:晚稻破口前,在顶叶和叶枕处,就有蓟马的成虫和若虫,并有少数潜入苞内。据观察,多数在抽穗后3—4天开花时侵入颖壳,吸食花器汁液。再经4天左右,谷粒普遍变成黑褐色空壳。据四个生产队
Late rice mahogany phenomenon in our county in recent years, increasing. In the past we thought it was caused by cold spells and diseases. Through repeated surveys, we found that rice thrips damage late rice flower, can also cause a lot of empty shell. I. Thrips Species: In recent years, we conducted a series of surveys on the Yuen Ping Pingshan area located at an altitude of 300-800 meters above sea level. More than 24,200 pieces of late rice (including late-season rice) chaffs were successively peeled to identify the main types of thrips Thrips tabaci (Thrips tabaci), accounting for 75.9%, followed by rice thrips, accounting for 24.1%. Second, the damaging process: late rice break before, in the parietal lobe and leaf pillow, there are thrips adult and nymphs, and a few dive into the bud. It is observed that the majority invades the glume shell when flowering 3-4 days after heading and takes in flower juice. After about 4 days, the grains became dark brown shell. According to four production teams