Guava Diseases; Fig. Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. Scabs were formed on heavily infected fruits. Eventually the lesions will dry and flake off the leaf surface, leaving a small depression. The causal organism is Cephaleuros virescens, a green parasitic alga whose usual hosts are plants with leathery leaves such as cotoneasters, magnolias, hollies, rhododendrons and viburnums.Algal leaf spot is sometimes called green scurf because the spots … Algal leaf spot lesions on guava foliage Symptoms Orange, rust-colored, dense, silky tufts on both upper and lower surfaces of leaves which turn reddish-purple in color as they mature; if tufts are scraped away, a thin gray-white or dark-colored necrotic spot remains on the leaf… Tree symptoms: Algal … Disease symptoms are exhibited on both abaxial and adaxial leaf surfaces as orange, rust-colored, dense silky tufts ranging from 5 to 8 mm in diameter. The associated algae were identified as Cephaleuros … The parasitic alga C. virescens predominantly affects leaves of mango and other hosts, but may also target branches and stems. UH–CTAHR Cephaleuros Species, the Plant-Parasitic Green Algae PD-43 — Aug. 2008 4 Left: Cephaleuros parasiticus spots on guava leaves appear initially as tiny, dark brown specks that enlarge into roughly circular lesions with ash-colored centers and dark brown to blackened margins (Hakalau, Hawai‘i). Leaf symptoms: Little damage is done to leaves, and the raised lesions can occur on either surface (Fig. Symptoms. They are characterized by furry growth (spores of the algae… 1 Anthracnose of guava fruit Fig. Symptoms of the disease occurred on the leaves and fruit. It is in the genus Cephaleuros and happens to be one of the only plant parasitic algae found in the United States. Algal leaf spot, also known as green scurf, is commonly found on thick-leaved, evergreen trees and shrubs such as magnolias and camellias. When the Pseudocercospora psidii gets into the host, it begins to reproduce rapidly underneath the lower surfaces of leaves. During 2014–2015, algal spot disease was noticed in the guava orchards of northern and southern Thailand. Although algal leaf spot is relatively harmless … Right: On the underside of the same leaf, spots … 7 Guava rust symptoms on fruit … Although commonly found on magnolias and camellias, algal leaf spot … Upon scraping away these spots, a thin, grayish white to dark-colored, necrotic crust remains on the leaf. 1). Infected leaves shows round, slightly raised, green to orange spots of 2-4mm diameter. Algal leaf spot. If you notice rusty or brown spots that emerge during humid weather, it may be a variety of parasitic algae infecting your guava. Algal leaf spot: Cephaleuros virescens Symptoms. 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