摘要
白背飞虱〔Sogatella furcifera(Horvath)〕是80年代以来我国最重要的害虫之一,白背飞虱种群发展与生态研究协作组组织全国9个单位于1986—1989年开展的为害损失测定及防治指标研究的结果表明,受害稻株谷粒千粒重下降,空瘪率增加,在前中期受害其稻穗总粒数和有效穗数减少;杂交稻受害后表现出较强的耐害和自身补偿能力;白背飞虱与褐飞虱混合种群为害时,产量损失大于单一白背飞虱种群为害时的损失。根据虫量与产量损失的预测模型,结合现行稻谷价格,产量水平,防治费用,经济效益以及天敌和防治风险等因素,本文提出了我国多数稻区现阶段白背飞虱允许为害损失率和不同稻区、不同生产水平的经济防治指标。
The white-backed planthopper(WBPH)Sogatella furcifera(Hor-v(?)th)has become a major rice insect pest again in southern Chinasince late 1970s.In 1986-1989,a nationwide cooperative research group,involving nine related units,on the population dynamics and ecologyof WBPH was set up to study and clarify the damage and economicthreshold of this insect pest to paddy rice.The experimental resultsshowed that the thousand kernel weight of damaged rice plants de-creased and their blighted grain rate increased,the mean grain numberper panicle and effective panicle number per unit area reduced as therice plants damaged in early-middle stage.There was rather strong toler-ance and compensation capability in damaged hybrid rice.The yieldloss rate caused by mixed population of WBPH and brown planthopperNilaparvata lugens St(?)l(BPH)was higher than that by WBPH alone.Based on the WBPH population-rice yield loss prediction model,com-bined with the price of rice,yield level,cost of control,benefit,nat-ural enemy efficiency and control risk,the economic tolerance of WB-PH in most rice areas in recent years and its economic thresholds indifferent rice areas at different production levels were proposed.
出处
《植物保护学报》
CAS
CSCD
北大核心
1992年第2期139-144,共6页
Journal of Plant Protection
关键词
水稻
为害
损失
白背飞虱
防治指标
white-backed planthopper
damage
rice economic threshold