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03
Aug

Bunt

1. In Bunt disease, a few grains in an ear are affected, the infection being either partly or wholly. The symptoms appear first as minute black Streaks bursting through the glumes at the ripening. 2. If the infected grain is crushed between the fmgers, a black powdery mass of spores emerges. The causal organism of the disease is Tilletia barclayana. 3. The is that develops inside the grain is filled with spores, which are spherical and dark, with a spiny epispore. The spore germinates and pr
03
Aug

Narrow brown leaf spot

1. Narrow brown leaf spot is also a minor disease and symptoms are brown coloured to dark coloured linear spots appear on the leaf blades. Spots may also OCCur in the leaf sheath, glume and parts of the stem. 2. Incidence of this disease is due to Cercospora oryzae. The pathogen produces conidia, which are hyaline or dark, filiform and several-celled. 3. Infected plant debris acts as primary sou
02
Aug

Leaf smut

1. This is a minor disease and is characterized by appearance of minute, sooty, dull, angular patches on the leaves, which represents the sori. In susceptible varieties, the fungus almost covers the entire leaf surface of the older leaves. 2. The disease is caused by Entyloma oryzae, which produces tel iospores and these are angular to globose, smooth-walled, light brown in colour. 3. The disease
02
Aug

False smut

1. The occurrence of this disease is believed to indicate a good year because weather favourable to the development of false smut also favours good crop production. The disease appears on the ears where individual ovaries are transformed into large velvety green masses of round to oval sclerotial bodies. As it gives the appearance smut sori, the disease has got the name as false smut. Only a few
02
Aug

Sheath rot

Previously this disease was considered as minor disease, but now it appears in a major form in many rice-growing areas of NE region. spots developed on the uppermost leaf sheaths enclosing the panicle as grey coloured irregular brown margins. The young panicle remains in the leafsheath or emerges only partially. Grains remain unfilled or are discoloured. In severe cases, panicles may rot. The diseas
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