【摘要】 1994年 - 1998年针对水稻对稻瘿蚊为害补偿力及经济阈值进行了研究 ,结果表明 :(1)水稻对稻瘿蚊为害具有较强的补偿能力 ,但基本属于不足补偿 ,不同标葱梯度其补偿力不同 ,每造成 1%的标葱引起的产量损失远小于 1% ,其补偿率一般在 55%～ 80 %之间 ,产量损失及其损失率与标葱数呈极显著正相关 ,有效穗和产量补偿率与标葱数则呈显著负相关 ;(2 )在相同受害程度下 ,密植损失大 ,补偿力小 ,而稀植损失小 ,补偿能力大 ,秧苗期补偿效应比分蘖期强 ;(3)在三明地区水稻受稻瘿蚊为害 ,每亩允许损失稻谷为 19.4 6 kg;(4 )稻瘿蚊主害代经济阈值为分蘖期标葱率 15%～ 2 0 % ,前代标葱达 3%～ 4 % ,主害代标葱率可达到经济阈值水平 ,应在主害代幼虫盛孵时下药防治 ;(5)根据水稻的补偿作用和标葱经济阈值 ,进行了大面积的生产示范 ,每亩提高经济效益约 15元更多还原

【Abstract】 In this paper, the compensative ability and economic threshold of rice harmed by rice gall midge (RGM)was studied during 1994-1998. The results showed that rice had strong compensative ability for harm of RGM. The rate of compensation of rice varied with the different number of leaffolder. Per unit of 1% leaflolder caused to less than 1% yield loss. In general, rates of compersation were usually in the range of 55%-80%. Yield loss and its rate were positively related to the number of leaffolder, but the number of panicle and yield compensation were negatively related with the number of leaffolder. At the same damage, yield loss in close planting was more than that in sparse planting, and the rate of compensation in close planting was lower than that in the sparse planting. Compensation effect of seedling stage was stronger than that of tillering stage. As the rice yield was 300kg, 400kg and 500kg per mu in Sanming city, the economic injury level was 6.49%, 4.87% and 3.89%, respectively. The economic threshold for harm of RGM was determined as 15%-20% leaffolder at tillering stage. As leaffolder rate of the 3rd RGM generation was 3%-4%, leaffolder rate of the 4th RGM generation could be up to threshold. The spray was suggested at the hatching peak of the 4th RGM generation.更多还原