Sheath Blight Reduced photosynthetic areas Use available fungicides such No variety has a high level of resistance as , Do not apply excessive nitrogen Leaves die Rhizoctonia solani Fungicides usually not economical and not recommended (Teleomorph: Yield reducti on by 20-25% For this disease, recommendations should include 1) provide wider Thanatephorus plant spacing 2) drain fields relatively early cucumeris) Brown spot Reduced photosynthetic area Seed treatment with Thiram, Provide adequate fertilizer spray Mancozeb Resistant varieties Helminthosporium Reduced grain weight and quality Hot water treatment of seed oryzae Sexual stage: Cochliobolus miyabeanus Leaf scald Reduced photosynthetic area Use Mancozeb products Avoid excess nitrogen fertilizer Monographella albescens Lowers filled grain ratio and grain quality Sheath rot Loss of photosynthetic area on None available No control known the uppermost leaf sheaths Sarocladium oryzae enclosing panicle Panicle remains in sheath
Sheath Blight Rhizoctonia solani (Teleomorph: Thanatephorus cucumeris) Reduced photosynthetic areas Leaves die Yield reducti on by 20-25% No variety has a high level of resistance Do not apply excessive nitrogen Fungicides usually not economical and not recommended For this disease, recommendations should include 1) provide wider plant spacing 2) drain fields relatively early Use available fungicides such as , Brown spot Helminthosporium oryzae Sexual stage: Cochliobolus miyabeanus Reduced photosynthetic area Reduced grain weight and quality Provide adequate fertilizer Resistant varieties Hot water treatment of seed Seed treatment with Thiram, spray Mancozeb Leaf scald Monographella albescens Reduced photosynthetic area Lowers filled grain ratio and grain quality Avoid excess nitrogen fertilizer Use Mancozeb products Sheath rot Sarocladium oryzae Loss of photosynthetic area on the uppermost leaf sheaths enclosing panicle Panicle remains in sheath No control known None available
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