论文部分内容阅读
褐稻虱(Nilaparvata luges Stal)是一种偏南方发生的暖湿性害虫。近十一年来,在我国南方稻区的暴发频率显著增高,1975年的特大发生,几乎波及整个东南亚稻区,1978年在我国东南沿海稻区又再度獗起。该虫在长江流域常于秋季中、晚稻穗期暴发成灾;1968年以来,曾在太湖稻区五次暴发,其中属特大发生的有1968年和1975年,属大发生的有1972年、1973年和1978年,每次暴发都给水稻高产带来严重威胁。 褐稻虱的自然发生程度,与水稻栽培布局的配置方式、品种抗虫性能及长相、农业栽培措施、定居后的虫口基数、大气与田间气候条件以及天敢的消长动态,都有一定关系。但生态实验与发生级差研究表明,褐稻虱对温度的反应比较敏感,在一个栽培、品
Nilaparvata luges Stal is a warm-moist pest that occurs southward. In the recent eleven years, the frequency of outbreaks in rice-growing areas in southern China increased significantly. In 1975, the outbreak of the outbreak hit almost the entire paddy area in Southeast Asia. In 1978, the outbreak of paddy rice in southeastern China started to rise again. The insect in the Yangtze River Basin often in the autumn, late rice panic of the outbreak of disaster; since 1968, had five outbreaks in the Taihu rice paddy, which is a generous occurred in 1968 and 1975, belonging to a large occurrence in 1972, In 1973 and 1978, each outbreak posed a serious threat to the high yield of rice. The degree of natural occurrence of brown planthopper has a certain relation with the disposition pattern of rice cultivation, the pest resistance and the appearance of the varieties, the agricultural cultivation measures, the population base after settling, the atmospheric and field climatic conditions, and the daring growth and decline. However, studies on ecological experiments and occurrences of grade differences show that brown planthopper is more sensitive to temperature. In a cultivated plant