Treating Black Leaf Spot Fungus. For the past three or four months, temperatures have been brutally hot consistently higher than 105 F, often more than 110 F . White, orange-scented blossoms turn yellowish upon pollination. As the fungus develops, those black spots on leaves are ringed with yellow. Information about Pittosporum Plants. Leaf spot, bacterial blight, and crown/root rot can also cause problems. In its early stages, the Alternaria leaf spots are similar to the Angular leaf spots. 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). Flowers, which do not differ in anything from those of Pittosporum tobira, are small, plentiful, white and full of aroma. 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. ITs all over the leave, the wood and even the trunk of the worst affected plant. Getting rid of black leaf spot must be a two-pronged attack. 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. LEAF SPOT The symptoms of this problem are dark spots on the leaves. 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. Very cold temperatures and frost can … No serious insect or disease problems though aphids, scale, mealybugs, root-knot nematodes, and whiteflies may occur. nov. Pittosporum are generally healthy plants with the problems noted below being caused by cooler than average conditions or water-logging. 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. Affected leaves eventually fall off and in bad cases the plant can be severely affected. PLAKIDAS: ANGULAR LEAF SPOT OF PITTOSPORUM 607 TECHNICAL DESCRIPTION Cercospora Pittospori sp. Pittosporum tenuifolium is susceptible to leaf spot and powdery mildew infections. 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. It may also suffer from infestations of pittosporum sucker, aphids or cushion scale. Pittosporum plants are very versatile and thrive well in the sun or shade. If grown indoors the two-spotted spider mite can be a problem. ... 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