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Chemical control of Rice Tungro Virus vector

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The spread of rice tungro disease can be checked indirectly by controlling the vector by suitable pesticide application. As the plants are more vulnerable to RTV infection during early stages of growth, chemical protection of the nursery effectively reduces green leafhopper population and thereby minimises the build up of virus inoculum as well as the pace of transmission.

Nursery Protection
Nursery protection is the key to successful managementof RTV. Incorporate carbofuran 3 G @ 30 to 35 kg I ha or p ho rate 10 G @ 12 to 15 kg I ha of nursery in top 2-5 cm layer of the soil before sowing sprouted seeds. If such incorporation is not possible, broadcast the recommended insecticides 4 to 5 days after sowing in a thin film of water and allow this water to seep completely. A further foliar spray application of monocrotophos 36 EC (@ 1.0 I I ha) or carbaryl 50 WP (@ 2.0 kg I ha) or phosphamidon 85 WSC (@ 0.65 11 ha) should be given around 15th and 25th day after sowing, depending on green leafhopper population. Do not use the same insecticides for repeated applications as a long term pest management strategy.

Protection in later crop growth stages
Usually gall midge and stem borer also appear in the field along with green leafhoppers as a complex. For such situations, carbofuran 3 G (@ 25 kg I ha) orphorate 10 G (@ 7.5 kg I ha) may be applied 10 days after planting. Depending on the further need and intensity of disease occurrence, recommended plant protection measures already indicated may be adopted.

File Courtesy: 
Directorate of Rice Research, Hyderabad
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