矮腥在病土田里不时发生是受许多物理的和生物的因子影响的。经过一个冬季的接种试验,显示小麦植株在苗期以后一个很长时期是感病的。从雪及各种人为的冬季遮盖物对诱发矮腥发病的影响,显出侵染可能发生在冬季。purdy等证明侵染确在冬季发 The appearance of dwarf fish in sick fields from time to time is affected by many physical and biological factors. After a winter inoculation test, wheat plants were susceptible for a long time after seedling. The effects of snow and various artificial winter covers on the incidence of dwarfing appear to indicate that infection may occur in winter. Purdy proved that the infection really made in winter hair