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毛白杨锈病对于毛白杨苗木和幼树生长是极不利的。这种病害在我国尚系初次发现。病原菌以菌丝状态在寄主冬芽或嫩梢中越冬,春季3、4月间冬芽开展时即在嫩叶上出现夏孢子堆,成为初灰侵染的主要来源。4月下旬—5月上旬是病害的大暴发期,6月底—7月初达到高峰,并持续到9月底。接种在叶背面绒毛上者,予以大气饱和湿度,在19.8—23.6℃中,1—2天即萌发;但接种在叶面者极少萌发。潜育期在日平均温度14.2—19℃中(变温范围15.6—23℃)为时4—4.5天。病害流行期中,月平均温度为18.2—26.8℃,相对湿度低达48.1%时仍不受影响。冬孢子堆多生于叶背面原来生夏孢子堆处的外围或附近处,隆起作馒头状,其上复有寄主的表皮组织。各孢子为棱柱状,顶端略平而圆,无棱角,上宽下窄,淡褐色,37.5—50×7.5—10微米大小,壁厚2微米,表面平滑。根据冬孢子形态,病原菌暂定名为 Melampsora rostrupii Wagner。
Populus rust is extremely unfavorable to the growth of Populus tomentosa seedlings and saplings. This disease is still found for the first time in our country. Pathogenic bacteria in the mycelial state in the host winter buds or young shoots in winter, spring in March and April when the winter buds that appear on the young leaves of summer spores, as a primary source of ash infection. In late April - early May is the outbreak of disease, the end of June - early July peaked, and continued until the end of September. Inoculated on the back of the villi on the hair, to be saturated with atmospheric humidity, in 19.8-23.6 ℃, 1-2 days that germination; but inoculation in the foliage rarely germination. The incubation period in the average daily temperature of 14.2-19 ℃ (temperature range 15.6-23 ℃) for 4-4.5 days. Disease prevalence period, the average monthly temperature of 18.2-26.8 ℃, relative humidity as low as 48.1% still unaffected. Winter spore pile was born in the back of the back of the original raw umbilicus spores pile at the periphery or near the Department, uplift for the bread-like, on which complex host epidermal tissue. The spores are prismatic, the top is slightly flat and round, angular, wide and narrow on the narrow, light brown, 37.5-50 × 7.5-10 microns in size, wall thickness of 2 microns, the surface smooth. According to the teliospore morphology, the pathogen tentatively named Melampsora rostrupii Wagner.