Diagnostic studies were performed on 4 viruses isolated from several lettuce plantations in the central region of Poland. Identification was based on the host range, including tests plants and different lettuce cultivars, on the characteristics of virus transmissibility, as well as on their physico-chemical properties, electron microscopy and serology.
Studies were carried out on the efficiency of spray application of two common fungicides on the infection of tobacco (Nicotiana tabacum cv. Xanthi nc.) with the tomato mosaic virus (ToMV) applied by mechanical inoculation. Out of two tested fungicides only Curzate was able to reduce effectively virus infectivity (by ca 57%), when applied 4 hours before inoculation with ToMV. The effect of inhibition decreased with time elapsing between the moments of fungicide treatment and virus inoculation. Both fungicides did not influence infectivity when mixed with the virus in vitro.
Globalization resulted in increased international movement of both people and plant material or plant products, including seeds. It is estimated that up to one third of all plant viruses might be seed-borne in at least one of their hosts. In this way viruses may be comparatively easy spread to regions where they have not previously been reported. Dissemination of viruses by seeds might be minimized by using the molecular diagnostic tools. In this paper a problems connected with the detection of viruses in seeds are presented.
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.