Abstract:
Tomato spotted wilt virus (TSWV) is commonly found in the United States, Mexico, Australia, Russia, Hawi and China and is injurious to tomato throughout the world. The virus attacks approximately two hundred species relating to dicotyledonous and monocotyledonous plants. Virus particle is spherical and has a density of 1.207 gcc. Externally the growth of the plant stops and young leaves curl downward get dark spots, increase in size until the leaflets become brown and shrivelled. After a few weeks the stem gets stunted having patches. Internally, under electron microscope semi circular electron dense bodies are found in the diseased tissue. Plastids are surrounding the loose aggregates and are seen moving away from the nucleus, finally the nuclei get distorted. TSWV is juice transmissible and it takes place in the larval form. The thrips penetrate the epidermis and suck the mesophyll causing silvery scars, left behind on the leaves. Three days after the symptoms appear, the plants are removed to darkness for 24 hrs to remove the chlorophyll contents. By heating the infectious sap at 450°C for 10 minutes 90 % virus infectivity is lost. Various oxidizing agents such as KCN, Catechol, quinone and other phenols inactivate the virus. For the control of virus there is a process called glass house it should have no other plants like lettuce and dahlias. If the disease appear in the house, it should be disinfected with D. D. T. containing dust. Outdoor crops should be grown away from the flower garden. Fields should be cleared from weeds and infected plants.
Page(s):
57-65
DOI:
DOI not available
Published:
Journal: Sultania, Volume: 1, Issue: , Year: 1975