Oleander scientific name Nerium indicum Mill. Apocynaceae woody plants. Leaves, flowers medicine; toxic. With strong diuretic, expectorant effect. Most provinces and regions in the country are distributed.
Symptoms mainly affect the leaves, with purple-red dots appearing at the tips of leaves or leaves, and round, semi-circular to irregular-shaped brown lesions after expansion. The lesions have a ring pattern. In the later period, the central government retreated to white, and the edge was reddish-brown. When the humidity is high, both sides of the lesion can grow brown-brown mildew layer, which is the conidial stem and conidia of the pathogen.
The pathogen Cercospora neriella Sacc. is known as the oleospora oleracea, which is a fungus of the subphylum Aspergillus. The seat is dark brown, size 25-125μm. The conidiophore stalks were light in color, uneven in thickness, clustered into bundles, with septa 0-3, unbranched, with a small spore mark at the top, size 5-353-5 (μm). Conidia cylindrical, with 1-5 diaphragms, size 15-503-5 (μm). In addition, C. nerii-indici Yaman said Cercospora oleracea is also the cause of the disease.
Transmission routes and pathogenic conditions The pathogens are overwintering on the diseased leaf with mycelium or with the leaves on the soil surface. In late spring, conidia are produced and spread to oleanders through wind and rain. The germinating spores invade from stomata or wounds and cause morbidity. From July to July, the seedlings grew too densely or weakly.
Prevention methods (1) Strengthen the management of seedlings, and should not be planted too dense to clear the diseased leaves and burn them. (2) Spray 50% benomyl WP 1000 times or 25% carbendazim wettable powder 600 times and 36% thiophanate-methyl suspension 500 times in the early stage of disease.
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