Symptoms After the heading of rice, dense purple needlepoint-sized purple dots are produced on the flag leaf sheath, and then gradually expand to most of the leaf sheath or the whole leaf sheath becomes purple-brown. The leaf sheath is particularly evident on the outer wall, sometimes invading the inner wall or reaching the stem deeply. The diseased sword leaves died 7-10 days earlier. Sometimes extended to the second to third leaf sheaths, but the leaves do not die, when the humidity is high, the disease part is white powder, that is, the pathogenic bacteria conidiophores and conidia. Grain lesions produce brown lesions or brown spots, and 1000-grain weight drops. It is thought that this symptom is a purple sheath type that occurs after heading of rice leaf sheath spoilage disease.

The pathogen is called spores of Chinese lychee and is a fungus belonging to the subphylum Fungi. The morphological features are basically similar to those of S. oryzae. It is considered that this disease is the same pathogen as leaf sheath spoilage disease.

Prevention and control methods When dealing with purple sheath disease, 50% benomyl wettable powder should be sprayed 1500 times when rice 6% has been eared, and 50% carbendazim 60 g can be used per 667 square meters plus 5% borera. With 80 ml of water and 65-70 liters of water, the spray control effect is more than 80%.

Antiparasitic & Antimycotic

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