Bull. Spec. CORESTA Congress, Manila, 1980, p. 93, P13, ISSN.0525-6240

Tomato spotted wilt virus on tobacco

Tobacco Institute, Drama, Greece, Tobacco Experimental Station, Rila, Bulgaria, Central Laboratory, Tobacco Industry, Krakow, Poland
Tomato spotted wilt virus (TSWV) is an important disease of many crops and ornamentals. It has an extremely wide host range and a worldwide distribution. It affects tobacco in many countries but has recently become a serious threat to tobacco production in some European countries. The disease causes considerable tobacco yield losses under certain circumstances. The virus is very unstable having a life of only three or four hours in vitro. It is rapidly inactivated at high and low pH values and by oxidants. It has at least three strains of different virulence. The only known natural means of transmission is by the insect, thrips. Of the four thrips species known as vectors of the virus, Thrips tabaci predominates in Europe. The disease epidemiology is directly related to the biology and epidemiology of its vector thrips. The virus overwinters mainly in the perennial weed hosts as well as in the body of the hibernating viruliferous thrips. Dry and hot weather conditions which favor the multiplication and the activity of the vector are responsible for disease outbreaks. Control of the disease can be achieved either by effective foliar spray programs with using suitable thripicides or by systemic soil insecticides. Some cultural practices may also contribute to the reduction of disease incidence.