Screening of Tomato Varieties for Resistance to Tomato Leaf Curl Viral Disease under Field Conditions
Screening of Tomato Varieties for Resistance to Tomato Leaf Curl Viral Disease under Field Conditions
Sajad Ali Solangi1, Jamal-U-Ddin Hajano1*, Rehana Naz Syed1, Sohail Ahmed Otho2, Khadim Hussain Wagan1, Agha Mushtaque Ahmed2, Fahad Nazir Khoso2, Aftab Raza Jarwar3 and Suman Tarique Qazi1
ABSTRACT
Tomato (Lycopersicum esculentum Mill.) is important vegetable in Pakistan. Tomato leaf curl viral disease caused by tomato leaf curl virus (TLCV) (genus: Begomovirus, family: Geminiviridae) and transmitted by whitefly (Bemisia tabaci) is considered as the most devastating one. Recently, available tomato varieties are not screened against this disease in the agro-ecosystem of Sindh Province of Pakistan. Therefore, in this study 12 commercial varieties of tomato such as, TO-1057, Advanta-1225, T-1359, Yaqui, Sahil, Ayushman, Early king, Advanta-1211, Kiara, Lima, Advanta-1209 and Ashoka were screened against the disease under field conditions during Rabi and Kharif growing season 2017-18. Observations were taken on disease incidence, severity and whiteflies population at interval of week after date of transplantation. Additionally, relationship among the disease and vector insect was determined. The minimum incidence of the disease was recorded in variety Advanta-1211 (13.85%) and Lima (18.85%) followed by T-1359 (23.30%), Early king (25.51%), TO-1057 (27.21 %), Advanta-1225 (29.41%). Minimum 1-rating score was recorded in Advanta-1211, Lima and T-1359 varieties. Significantly minimum number of whiteflies was recorded in variety Lima (2.3 whiteflies), Advanta-1209 (2.3 whiteflies), Kiara (2.4 whiteflies) followed by Advanta-1211 (2.5 whiteflies). There was non-significant relationship of vector insect with both incidence as well severity of tomato leaf curl disease, r2= 0.07068, P= 0.8272 and r2= 0.2869, P= 0.3660, respectively. Based on the results, it is concluded that the minimum incidence and severity of tomato leaf curl disease was recorded in variety Advanta-1211, Lima and T-1359. In rabi season the disease intensity was lower as compare to kharif season. Therefore, it is suggested that variety Advanta-1211, Lima and T-1359 should incorporated in the disease management plan.
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