In Hyadaphis erysimi pseudobrassicae (Davis), the ratio ranged 8.-9.7 (9 per cent fiducial limit) or 8.9-0.0 (99 per cent fiducial limit) five to six days before the appearance of nymphal alatae.
In Hyadaphis erysimi pseudobrassicae (Davis), the ratio ranged 8.-9.7 (9 per cent fiducial limit) or 8.9-0.0 (99 per cent fiducial limit) five to six days before the appearance of nymphal alatae.
菜缢管蚜有翅若蚜出现前—天其比值为8.—9.7(9％置信限)或8.9—0.0 (99％置信限)。