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近年来,稻小红瓢虫在稻田生物群落的分布中,常占着较大的比重,尤以7-9月早、晚稻抽穗扬花期,其分布数量常居首位;由于成虫、幼虫此时喜取食水稻花药,故被列为水稻穗期的主要害虫之一。而它的消长常常成为多种害虫(稻蓟马、稻螟蛉、三化螟、稻潜叶蝇)的“晴雨表”,并不与它“公害后果”空谷率的增减成比例。1973—1974年,我们分别对这两种现象进行了调查观察,基本肯定稻小红瓢虫对水稻无害,而且还是多种害虫的天敌。现将调查观察结果整理于后。
In recent years, the small red ladybugs in the distribution of rice field biomes, often account for a larger proportion, especially in early September and early September, late rice heading and flowering period, the number of its distribution ranks first; due to adults, larvae Shi Xi eating rice anthers, it is listed as one of the major pests in rice heading stage. And its decline is often the “barometer” of many pests (rice thrips, rice borers, rice stem borer, rice leaf miner) and is not proportional to the increase or decrease of its “haz- ardous consequences”. From 1973 to 1974, we investigated and observed these two phenomena respectively, basically confirming that the rice ladybug is innocuous to rice and also a natural enemy of many pests. Now the survey findings after finishing.