Okra (Abelmoschus esculentus L.) is susceptible to number of diseases like Yellow Vein Mosaic Virus disease, Damping Off, Fusarium wilt, Powdery Mildew and Enation Leaf Curl. The Okra is favorite host of whitefly which transmits the okra Yellow Vein Mosaic Virus (OYVMV). OYVMV disease causes considerable yield losses in Okra. Experiment was conducted to check the efficacy of organic matter (poultry manure, leaves) and insecticides (Acetamiprid, Diafenthiuron, Pyridine Carboxamide) against OYVMV and its whitefly vector. In this experiment, ten okra varieties were sown in randomized complete block design (RCBD). Organic matter and insecticides were applied at recommended doses (@5ml/L) on weekly intervals. Among insecticides, Acetamiprid showed the best result to manage whitefly infestation with 60.01% mortality and OYVMV disease severity with 53.98% efficiency. Polo (Diafenthiuron) also showed good results to manage whitefly (56.36%) and OYVMVD (46.34%), but Ulala (Pyridine Carboxamide) insecticide was least effective to control whitefly population (47.27%) and to manage the infection of OYVMV disease (43.91%). Leaf manure was more effective with 61.16% efficiency as compared to poultry manure (56.01%) against OYVMV disease severity. New chemistry insecticide (acetamiprid) gave the most effective control of whitefly and transmission of OYVMV and could be used in place of conventional insecticides. Leaf manure proved significant defense activator in okra plants with effective control of disease and could be used as eco-friendly management approach.

Iftikhar, Y., M. Mubeen, A. Sajid, M.A. Zeshan, Q. Shakeel, A. Abbas, S. Bashir, M. Kamran and H. Anwaar. 2021. Effects of Tomato Leaf Curl Virus on Growth and Yield Parameters of Tomato Crop. Arab Journal of Plant Protection, 39(1): 79-83. Tomato is an important vegetable crop, belongs to the family Solanaceae and is the second most consumed vegetable following potatoes. The tomato crop is grown all over the world in both summer and winter seasons, and plant viruses are a major threat to tomato production. Among these viruses, tomato leaf curl virus (TLCV) causes considerable yield loss to tomato crop. This virus is transmitted by a whitefly (Bemisia tabaci) vector. In this study, the effect of TLCV infection, on the following tomato growth and yield parameters, was evaluated: plant leaf number and area, plant biomass, plant height, root length, and plant stem diameter and yield. Tomato plants were transplanted in wellprepared plots with 4 replications. The control group was covered with polyethene bag to avoid whitefly infestation. Plants were scored on the 15th and 30th day after inoculation and TLCV disease severity was recorded. Analysis of variance (ANOVA) showed the significant differences between the healthy and infected tomato plants. Moreover, growth and yield parameters were reduced with the increase in disease incidence, disease severity and whitefly infestation. Disease severity was increased with the increase in temperature during the growing season. It can be concluded from this study that TLCV significantly affects growth and yield of the tomato crop. Keywords: Tomato, Tomato leaf curl virus, TLCV, disease incidence, disease severity.