麦田小气候对第一代粘虫发生数量影响的研究

麦田小气候因子对粘虫的发生有一定影响。栽培技术及小麦生长情况不同农田小气候特点各有不同,因而影响粘虫发生数量及发育进度的变化很大;禾苗生长愈茂密,小气候相对湿度愈高,温度愈低。此种条件下,粘虫发生数量较大而发育进度较慢。杂草丛生的农田粘虫发生即多,被害严重,这可能也是受小气候因子的影响所致。预测预报时应注意这些规律。

FIELD STUDIES ON THE EFFECT OF MICROCLIMATE ON THE POPULATION DENSITY OF THE ARMYWORM

Studies on the effect of microclimate of the wheat fields on the population density of the armyworm,Pseudalstia seperata(Walker),were made in 1959.It was found that the population density of the armyworm was affected by the relative humidity and the speed of larval development was influenced by the temperature of the wheat fields.The microelimate of the wheat fields varied with the rate of planting and the growth conditions of the crop.Relative humidity was found to be higher when the growth of wheat was more luxuriant,while temperature was higher when vegetation was thinner.It is pointed out that theeffect of the changes of mieroclimate of the wheat fields on the population fluctuations of the armyworm following various changes of cultural practices should receive more attention in the future.