EFFECTS OF TEMPERATURE, HUMIDITY AND LIGHT ON THE GERMINATION OF CONIDIOSPORES OF SPRING WHEAT POWDERY MILDEW IN NINGXIA IRRIGATED AREA / 微生物学通报

ABSTRACT

In Ningxia irrigated area, the conidiospores of Erysipe graminis f. sp. tritici on spring wheat germinated at -3 -- 29℃ (optimum 10 — 15℃). At 33℃, no conidium germinated, although the conidiospores might germinate in the relative humidity of 0—100%, yet they did best in a saturated atmosphere. Ultra-violet light killed the conidiospores. Under the direct solar radiation the percenta ge of germination was 13.86%, in the diffused light, 34.33%, in the darkness, 38.57%.