家蚕品种云蚕7×云蚕8不越年卵的发生条件探析

Exploration on the Occurrence Condition of Non Hibernating Egg of Yuncan 7×Yuncan 8

蚕品种云蚕7、云蚕8发生不越年卵与催青温度、蚕期饲养的温度、光照及桑叶的质量密切相关:在高温30℃或低温15℃条件下催青,下一代有向不越年化性转变,壮蚕期饲养温度过高或过低以及光照时间太长或太短都有发生不越年卵的倾向;饲料桑叶的老嫩对不越卵的发生有一定的影响。

The occurrence of non hibernating egg of Yuncan 7×Yuncan 8 is closely related to the incubation temperature,the rearing temperature in silkworm period,sunlight as well as mulberry leave quality.When incubated under the temperature of 30℃ or-15℃,the next generation tends to become non hibernating;if the temperature is too high or too low,or too short or too long time of exposure to sunlight in the grown silkworm period,it tends to be non hibernating;the quality of the mulberry leave has a certain effect on egg＇s non hibernation.