摘要
我国长江沿岸地区松毛虫二、三代分化的决定因子是光周,分化的比例决定于第二代幼虫孵化的时间。八月初以前孵化的,大部份可完成二代进入三代,而八月上、中旬以后孵化的,绝大部份就以第二代幼虫越冬。分化比例的大小明显地影响越冬虫口的基数。温度和营养等因子通过对松毛虫生长发育的影响,而影响其二、三代的分化。重庆地区松毛虫的临界光周值为13 h30 min左右,二、三代分化的临界日期在八月上旬前后,这一问题的解决为长江沿岸松毛虫种群生态学研究的进一步深入和数量变动的预测提供了基础和依据。
Obviously the most important factor to determine the differentiation of the Pine Caterpillar in the second generation is photoperiod experienced in its early larval period and the differentiation is associated with its population dynamics in nature along the Yangtze River area. The ratio of the third generation produced in field is closely related with the hatching date of eggs in the second generation each year. Most of the larvae hatched in early Augst can complete the second generation and grow up into the third generation, but the larvae hatched in mid-late August can not do so. The annual differentiation varied with the temperature and other factors could greatly effect the population density in hibernation. The critical photoperiod required by the Pine Caterpillar is around 13.5 hrs and the critical date fell on early August in Chongqing region, Sichuan Province, so these larvae hatched before the critical date can produce the third generation or vice versa. The present paper provide some useful date and hints to forecast and manage the pest in the Yangtze River area.
出处
《林业科学研究》
CSCD
北大核心
1991年第4期409-413,共5页
Forest Research
基金
国家自然科学基金
关键词
松毛虫
光照周期
世代分化
photoperiodic reaction (PhPR)
differentiation of generation
Pine Caterpillar
