longicornis, or deltamethrin and Diopsis Diopsis materials. thoracica, spp.) Rice Caseworm Use resistant varieties. Insecticides are not commonly used in (Nymphula northern Ghana against caseworm. Ensure balanced nutrition (avoid excessive nitrogen application). depunctalis) Removing weedy vegetation on the levees in spring near the time of seeding. Many predators control caseworm naturally. Use wider spacing and earlier planting. False smut on rice Some hybrids and varieties are more resistant than others. Fungicides are generally not used for (Ustilaginoidea most smuts. Avoid mechanical injuries to plants and maintain well-balanced soil fertility. virens, Entyloma Rotate to another crop, the longer the better. oryzae) Use of disease-free seeds that are selected from healthy mother plants. Split nitrogen applications. Removal and proper disposal of infected plant debris. Avoid field activities when the plants are wet. Brown leaf spot Use resistant varieties. Seed treatment with captan, thiram, or (Bipolaris mancozeb. Careful use of fertilizer can do much to prevent the disease oryzae) Burn or feed stubbles after harvest Hot water treatment of seeds Rice blast Use of resistant cultivars. Use application of synthetic fungicides (Pyricularia containing mefenoxam (metalaxyl-M). Destruction of infested residue. oryzae) Use of certified clean or non-infested seed. Water seeding (not drill seeding). Continuous flooding. Avoid using excess nitrogen. Do not plant too early or too late. Avoid close planting in nurseries. Use an integrated weed management scheme: Rice weeds Pre-emergence: use an herbicide Perform thorough land preparation (soil tillage, fertilizer, and water containing pendimethalin plus hand management). weeding/hoeing. Narrow row spacing makes the crop more competitive than the weeds, use Post-emergence: use an herbicide intercropping. containing trichlopyr selectively control broadleaves and sedges. Place the fertilizer in such a way that the crop has access to it but the weeds do not. This allows the crop to be more competitive with weeds. Keep the surroundings of farm free of weeds, unless they are maintained and
longicornis, Diopsis thoracica, Diopsis spp.) or deltamethrin and materials. Rice Caseworm (Nymphula depunctalis) Use resistant varieties. Ensure balanced nutrition (avoid excessive nitrogen application). Removing weedy vegetation on the levees in spring near the time of seeding. Many predators control caseworm naturally. Use wider spacing and earlier planting. Insecticides are not commonly used in northern Ghana against caseworm. False smut on rice (Ustilaginoidea virens, Entyloma oryzae) Some hybrids and varieties are more resistant than others. Avoid mechanical injuries to plants and maintain well-balanced soil fertility. Rotate to another crop, the longer the better. Use of disease-free seeds that are selected from healthy mother plants. Split nitrogen applications. Removal and proper disposal of infected plant debris. Avoid field activities when the plants are wet. Fungicides are generally not used for most smuts. Brown leaf spot (Bipolaris oryzae) Use resistant varieties. Careful use of fertilizer can do much to prevent the disease Burn or feed stubbles after harvest Hot water treatment of seeds Seed treatment with captan, thiram, or mancozeb. Rice blast (Pyricularia oryzae) Use of resistant cultivars. Destruction of infested residue. Use of certified clean or non-infested seed. Water seeding (not drill seeding). Continuous flooding. Avoid using excess nitrogen. Do not plant too early or too late. Avoid close planting in nurseries. Use application of synthetic fungicides containing mefenoxam (metalaxyl-M). Rice weeds Use an integrated weed management scheme: Perform thorough land preparation (soil tillage, fertilizer, and water management). Narrow row spacing makes the crop more competitive than the weeds, use intercropping. Place the fertilizer in such a way that the crop has access to it but the weeds do not. This allows the crop to be more competitive with weeds. Keep the surroundings of farm free of weeds, unless they are maintained and Pre-emergence: use an herbicide containing pendimethalin plus hand weeding/hoeing. Post-emergence: use an herbicide containing trichlopyr selectively control broadleaves and sedges.
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