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病菌(Stagonospora curtisii)主要危害朱顶兰(Amaryllis vittata)叶片及花梗,其次危害鳞茎。病斑呈椭圆形、纺缍形或半圆形。被害部初期呈鲜红色,后期转赭红色,其上密生黑色小点。菌丝生长的适宜温度为15～30℃,最适为25℃;适宜pH位为4～9,最适为6左右;菌丝生长对培养基具有一定的选择性,以PSA培养基最佳;对碳源的利用以蔗糖、葡萄糖最佳,山梨糖最差;对氮源的利用,有机氮及无机氮均能利用,其中以牛肉浸膏和门冬酰胺最佳,尿素最差;分生孢子萌发的适宜温度为15～30℃,最适为25℃,高于35℃或低于8℃时孢子均不能萌发。
Stagonospora curtisii harms the leaves and pedicels of Amaryllis vittata, and secondly endangers the bulbs. Lesions were oval, spiraled or semicircular. Victim was initially bright red, late red ocher, the black spots on the dense. The suitable temperature for mycelial growth was 15-30 ℃, and the optimum was 25 ℃. The suitable pH was 4-9 and the optimum was about 6. The mycelial growth had certain selectivity to the medium, ; Use of carbon source to sucrose, glucose best, sorbose the worst; use of nitrogen sources, organic nitrogen and inorganic nitrogen can use, of which the best beef extract and asparagine, the worst urea; points Spore germination suitable temperature is 15 ~ 30 ℃, the most suitable for 25 ℃, above 35 ℃ or below 8 ℃ spores can not germination.