摘要
为更好地指导生产 ,进行了板栗针叶小爪螨冬卵数量变动及发育规律的初步研究。结果表明 ,针叶小爪螨以卵在 1～ 4a生枝条上越冬。其自然死亡率达 89 2 % ,春季降大到暴雨 ,对冬卵的冲刷减退率为 6 4 2 %。冬卵 5月初开始孵化 ,5月 8日前为孵化始期 ,5月 9日后为盛期 ,5月 2
In order to guide production,studies were given to egg amount variation in winter of Oligonychus ununguis and its developmental regularities.Results showed that this insect was found to overwinter in egg stage on 1～4 year old branches,and their natural mortality rate was 89 2%.Heavy rain in spring could reduce its egg amount by 64 2%.The overwintered eggs start to incubate on may 8,and end on May 20.During this period,the incubation peaks appear after May 9.
出处
《河北林果研究》
2000年第3期265-268,共4页
Hebei Journal of Forestry and Orchard Research
