41+ Algal Leaf Spot Magnolia. Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. The key symptom of algal leaf spot is the formation of raised blotches on the leaves.
Penyakit bintik daun alga, juga dikenal sebagai green scurf, disebabkan oleh cephaleuros virescens, sejenis alga parasit.
Algal leaf spot disease spores, which are spread by rain, create a big problem for more than 200 plant species, especially plants growing in warm, humid climates. Leaf spots produced by native rust fungi are described in leaflet no. This disease, caused by parasitic algae, is most common in the southeastern part of the united states, where it is hot and humid. Poor nutrition, poor soil drainage and too much or too little shade create conditions that favor the disease.