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灰飞虱是传播玉米粗缩病和水稻黑条矮缩病的重要传毒媒介,2007年以来,连续五年在山东省发生严重,对玉米和水稻生产造成严重威胁。根据历年灰飞虱发生情况,目前发生虫量,结合该虫发生规律、近期气象预报等综合分析,预计灰飞虱在鲁西南地区大发生,鲁南、鲁中及半岛地区偏重发生。预报依据:一是灰飞虱发生基数大。近期调查:济宁稻茬麦田一代灰飞虱平均亩虫量128万头,最高达到400万头,接近历史最高水平;菏泽一般麦田有虫50-200头/亩,密度高的地块达500头;
Laodelphax striatellus (L.) is an important vector of transmission of maize dwarf disease and black-streaked dwarf disease. Since 2007, serious occurrence of SBPH in Shandong Province has posed a serious threat to maize and rice production. Based on the occurrence of Laodelphax striatellae in the past years and the current occurrence of insect pests, combined with the regularity of the occurrence of the pest and recent weather forecast, it is estimated that Laodelphax striatellus occurs in the southwest of Shandong Province, while that of Lunan, Luzhong and Peninsula areas is prevalent. Forecast basis: First, the occurrence of Laodelphaxima large base. Recent surveys: Jining rice crop a generation of Laodelphaxima average mu number of 1.28 million, up to 400 million heads, close to the highest level in history; Heze general wheat fields with insects 50-200 / mu, 500 high-density land ;