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通过分析太湖单季稻区褐飞虱大发生年份的田间虫量,灯下诱虫量,定点调查田块的水稻品种和播种期,发现太湖单季稻区褐飞虱的迁入主峰期是7月10~25日。20世纪90年代后是7月10~20日,灯下7月5~24日的迁入峰可作参考;迁入峰只有1个,若遇水稻分蘖中、后期,则增殖1代就可进入主害代,若遇水稻分蘖前期,则需增殖2代才能进入主害代;从增殖代短翅型成虫高峰到主害代低龄若虫高峰的增值是主要的,起决定作用,从迁入主峰到增殖代短翅型成虫高峰的增值起辅助作用,处于分蘖后期至齐穗期的增殖代是主害代暴发的关键,盛夏高温对抑制单季稻褐飞虱的发生作用不大。随着农艺措施的改变,单晚发生期由8月中、下旬推迟到9月25~30日,褐飞虱的发生已进入了低迁入,高增长阶段。
By analyzing the field insects and the amount of trapped insects during the year of large-scale occurrence of brown planthopper in Taihu Lake single-cropping rice area, the main rice varieties and sowing dates of plots were investigated. The main peak period of brown planthopper in Taihu Lake was July 10-25. After the 1990s, July 10 to July 20, the lamp can be used as a reference for the immigration peak from July 5 to July 24; only one migrate peak, in case of rice tillering, the latter can proliferate for 1 generation Enter the main generation, in case of rice tillering stage, you need to proliferate two generations to enter the main generation; from the proliferation of short-winged adults to the main generation of juvenile nymphs peak value-added is the main, play a decisive role, from moving in The main peak of proliferation of short-winged adult peak value-added play a supporting role in the late tillering to full heading stage is the key generation of the main generation of outbreaks, summer high temperature on the suppression of single season rice brown planthopper did not play a role. With the change of agronomic measures, the single-night period was postponed from mid-August to September 25-30. The occurrence of brown planthopper has entered a phase of low migration and high growth.