BIOLOGICAL CHARACTERISTICS AND VIRULENCY OF Cucumber Mozaic Virus(CMV) ISOLATES BALIHORTICULTURE PLANT

Information regarding the biological character and virulence of CMV isolates from some horticultural plants from Bali is still limited. The results of research on this information are very much needed in further research and development of science and technology, because it is known that CMV infects several hoticulture plants and can cause various symptoms of infection or specific symptoms in certain plants. Based on these problems, this research was carried out through CMV biological testing and the virulence of CMV isolates found in a number of horticultural plants in Bali. So that the biological characteristics and virulence level of each isolate is known. The biological test results of CMV isolates from several Bali horticultural plants namely, cucumbers (CMV-MB isolates), eggplants (CMV-TRB isolates) watermelon (CMV-SB isolates), chilies (CMV-CB isolates),pumpkin (CMV-LB isolates), and tomatoes (CMV-TB isolates), showed mosaic symptoms occurred in the indicator plants Nicotianaglutinosa,Capsicum annuum (big chili), Cucumissativus (cucumber), Lycopersumesculentum (tomato), and Cucurbita moschata (pumpkin). Severe mosaic symptoms only occurred in Cucumissativus (cucumber) plants. In Vignasinensis (long bean) infection CMV-Bali isolates only cause symptoms of malformation and even cause no symptoms. Virulence test of these isolates in chilli plants showed results, the incubation period varied from 8.67 days in Pumpkin isolates (CMV-LB isolates) to 12.40 days in watermelon isolates (CMV- SB isolates). The highest percentage and intensity of disease occurred in Pumpkin isolates (CMV-LB isolates), with disease percentage reaching 80% and disease intensity 65%. Likewise in cucumber isolates (CMV-MB isolates), the percentage of disease reached 80% and the intensity of disease 62%. Pumpkin isolates (CMV-LB isolates) and cucumber isolates (CMV-MB isolates) are more virulent isolates compared to eggplant isolates (CMV-TRB isolates), watermelons (CMV-SB isolates), chilies (CMV-CB isolates), and tomatoes (CMV-TB isolates).