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03
Aug

Rice yellow dwarf

1. Rice yellow dwarf disease is characterized by general chlorosis, with pronounced stunting and profused tillering. The chlorotic leaves are uniformly pale yellow. The young infected plants usually produce either no panicle at all or a few small panicles with unfilled grains. Plants infected during later growth stages may not develop symptoms before harvest. 2. This disease is caused by phytopl
03
Aug

Rice tungro virus.

1. Rice tungro viral disease occurred in an epidemic form in NE states during 1969 and 1970.This is one of the most damaging diseases. Tungro ischaracterized by stunting ofthe plant and leaf colours range from various shades of yellow to orange, the discolouration and rusty blotchesspreading downwards from the leaftip. 2. The young leaves may show a mottled appearance and slightly twisted whereas
03
Aug

Bacterial leaf streak.

1. Bacterial leaf streak. is a bacterial foliar disease. The disease first starts on the leaves as small water-soaked to translucent interveinal streaks of 1-10 cm long. They elongate parallel to the veins and turn yellowish brown, which often coalesce to form large blotchy lesions covering the entire leaf Surface. Minute, yellowish orange beads of bacterial exudates appearing all along the lesions
03
Aug

Bacterial leaf blight

1. Bacterial leaf blight disease occurs mostly in low altitude areas of Tripura, Meghalaya and Arunachal Pradesh during July to September. The disease is caused by Xanthomonas campestris pv. Oryza. 2. The bacterium induces either wilting of plants or leaf blight. Leafblight phase is most commonly seen and typical symptoms are yellow to straw coloured stripes with wavy margins, generally on bo
03
Aug

Grain discolouration

1. Discoluration of rice grains. is becoming a major problem in certain varieties of rice both in upland and lowland conditions. It redUces the germination, causes decay of seedlings, produces chaffy grains and lowers the consumption quality of the grains. 2. The disorder may be limited to individual grains, but in severe cases almost the entire panicle including the rachis becomes discoloured. 3. Drechslera oryzae, Fusarium sp., Nigrospora oryzae, Penicillium sp., Curvularia sp., Saroclad
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