Control of Plant Viruses
1. Quarantine Laws:
The best way to control virus disease is to keep it out of an area through a system of quarantine, inspections and certifications.
2. Selection of Seed:
Select seed from disease free localities.
3. Selection of Planting Materials:
i. e Cutting, bull, rhizomes, tubers etc should be free from disease.
Eradication of diseased plant to eliminate the inoculum from the field.
Periodical indexing of the mother plants, producing Propagative organs is necessary to ascertain these continuous freedom from virus.
6. Protection Against Insect Vectors:
This can be done by growing trap crops to check the insect vectors. Ex. Cotton reddening, white flies in bhendi.
7. Soil Fumigation:
Nematodes transmitted viruses can be reduced by the soil fumigation to control nematodes.
Removal and destruction of weeds that serve as host, broad leaf weeds in banana, orchard reduce bunchy tops.
9. Use of Resistant Varieties:
Ex. Parbhani Kranti, yellow vein mosaic of the bhendi, sugarcane mosaic.
The disease caused by severe strains of virus can be avoided if the plants are inoculated first with a mild strain of some viruses. E.g. Citrus greening.
11. Temperature Treatment:
Sugarcane mosaic can be destroyed or reduce by hot water treatment 520 C for 30 minutes.
12. Use of Insecticides:
Control of insect vector with the use of insecticides.
13. Non Availability of Chemical Substances: (Demerits)
No chemical substance (Viroides) are yet available for controlling virus disease of plants in the field.