Preliminary studies on viral diseases of tomato in Malakand agency of North West Frontier Province [NWFP] Pakistan
1993
Hassan, S. | Arif, M. | Defoer, T. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Plant Pathology)
Intensive cultivation and monocropping of winter tomatoes in Malakand Agency (North West Frontier Province, Pakistan) have resulted in the occurrence of many destructive viral diseases which have caused tremendous losses both in yield and quality. Detailed and systematic work was conducted to determine the incidence, distribution, and losses due to viral diseases in Malakand Agency. An Average seedling infection of 30%, 15% and 20% of Tomato mosaic virus (TOMV), potato virus X (PVX) and potato virus Y (PVY) was recorded in tomato nurseries. Mean incidence of ToMV, Cucumber mosaic virus (CMV), Tomato yellow leaf curl virus (TYLCY), Tomato yellow top virus (TYTV), Tomato bushy stunt virus (TBSV), Tomato aspermy virus (TAV), Potato leaf roll virus (PRLV) and Tomato ring spot (ToRSV) virus on the basis of symptom expression and serodiagnosis, was 34.38, 12.92, 15.06, 8.26, 4.05, 1.48, 3.90 and 3.70 percent respectively. The predominant symptoms observed were mosaic, mottling, curling, bushy growth, shoe string, fern leaf, chlorosis, shoot proliferation and a variety of mixed symptoms. A reduction of 22.24% in fruit weight, 15.38% to 78.56% in fruit number and 25.77% in plant height was recorded, resulting in significant decrease in total yield.
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