common diseases of pittosporum are angular leaf spot, Rhizoctonia aerial blight, Southern blight, root rots and dieback. Information about Pittosporum Plants. Very cold temperatures and frost can … Q. Pittosporum Tree – Half Dead I've just returned from USA, having been away since early March, to find, with horror, that my Pittosporum tree (about ten feet tall) has an awful lot of dead leaves on it. Completely necrotic spots are rare, and the infected tissue remains alive for a very long time. Affected leaves eventually fall off and in bad cases the plant can be severely affected. Ive been trying to save a large, well established Pittosporum tenuifolium hedge which has been seriously suffering from what seems to be black sooty mould. Treating Black Leaf Spot Fungus. No serious insect or disease problems though aphids, scale, mealybugs, root-knot nematodes, and whiteflies may occur. Soon the entire leaf turns yellow and falls. nov. Learning the proper ways on how to plant and care pittosporum plants is easy. It may also suffer from infestations of pittosporum sucker, aphids or cushion scale. If grown indoors the two-spotted spider mite can be a problem. LEAF SPOT The symptoms of this problem are dark spots on the leaves. Getting rid of black leaf spot must be a two-pronged attack. Leaf spot, bacterial blight, and crown/root rot can also cause problems. ... Angular leaf spot will generate tan to light yellow spots on the upper side. As the fungus develops, those black spots on leaves are ringed with yellow. Both green and variegated varieties of Pittosporum shrubs in gardens in Florida, southern Louisiana, and along the Mississippi coast are affected by an angular, chlorotic spotting. Angular Leaf Spot Angular leaf spot, caused by Cercospora pittospori Plakidas, was first described in 1949 and is common in field and landscape plantings of pittosporum that are not routinely sprayed for its control. White, orange-scented blossoms turn yellowish upon pollination. The photo which I will attach shows at the bottom, two of the five Wheeler's Dwarf Pittosporum plants all of which I planted in the same manner in January of this year in the front of my house in Glendale, AZ (Zone 9). The leaves are leathery, ellipsoid – obovate, and gray – green color with peripheral creamy spots that sometimes extend to almost all the surface of the leaf. ITs all over the leave, the wood and even the trunk of the worst affected plant. Flowers, which do not differ in anything from those of Pittosporum tobira, are small, plentiful, white and full of aroma. In its early stages, the Alternaria leaf spots are similar to the Angular leaf spots. Spots angular, vein-limited, chlorotic, rarely necrotic, pale green to yellowish-brown above, light yellow to olive-brown below, soli-tary spots 1-5 mm., confluent spots much larger often covering more than one-half the area of the leaf. 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