上海地区单季晚稻褐飞虱发生规律的研究

通过1977～1990年2614次田间种群消长系统调查及对15417头长、短翅型雌成虫卵巢发育系统解剖证实,本地区单季晚稻最初虫源由南方迁入,迁入期通常在6月下旬至8月上旬,繁殖产生长、短二种翅型的成虫。从迁入建立种群到种群最终消失,可发生3～4个世代。田间种群数量动态与迁入基数、气温、食料及天敌等因子有关。其中,虫口基数和气温是种群大发生的主导因子。短翅型成虫大量出现是种群数量激增的预兆。

A STUDY OF POPULATION DYNAMICS OF BROWM PLANTHOPPER,NILAPARVATA LUGENS(STAL),ON SINGLECROPPING LATE RICE IN SHANGHAI AREA

This is a systematic study of population dynamics of brown planthopper on Singlecropping 1ate rice in Shanghai area.The 2641 systematic investigations on field population density from 1977 to 1990 and the systematic analyses on the growth of ovaries of 15417 macropterous and brachypterous female adults prove that the insects on Singlecropping late rice in this area originally is from the south immigration is usually from the last ten days in June to the first ten days in August, at which time macropterous and brachypterous adults grow.The process from immigration and fromation of the population to its extinction covers 3 to 4 generations.The population dynamics in the fieids relates to such factors as the number of insects immigrated,temperature,diet and natural enemies,etc.Diet and natural enemies have a stable influence on the population in years.As the number of insects immigrated and temperatur differ greatly in years,they are the leading factors of growth and reproduction.The number of brachypterous adults relates closely to the number of the population.The large number of brachypterous adults is a presage of a rapid increase of population.