EFFECT OF DIFFERENT PLANTING TIME ON TOMATO YELLOW LEAF CURL VIRUS (TYLCV) OF TOMATO AND ITS IMPACT ON YIELD

Abstract

A study was carried out at the Department of Plant Pathology, Sher-e-Bangla Agricultural University (SAU), Dhaka-1207, Bangladesh during the period of October’ 2016 to May’ 2017 in order to find out the effect of different planting time on Tomato yellow leaf curl virus (TYLCV) of tomato and its impact on the yield. Two collected BARI released variety namely BARI Tomato-14 and BARI Tomato-16 were used in this study that was transplanted at three different planting time (1 st planting time on 1 st November, 2 nd planting time on 15

November 2016 and 3 rd planting time on 1 st December 2016). The lowest percent disease incidence (12.42%) and percent disease severity (15.37%) were found in 3 rd planting (1 st December planting) and BARI Tomato-16 variety. Under the present study, considering the percentage of TYLCV disease incidence and severity, whitefly population infestation, growth and yield contributing characters as well as the yield of two tomato varieties in three different planting time; the 3 rd planting (1 st December planting) and BARI Tomato-16 variety was found having the highest yield (77.23 ton/ha) and promising the lowest level of percentage of disease incidence (12.42%) and disease severity (15.37%) against TYLCV. The percent disease incidence and severity were found positively correlated with temperature. A strong positive correlation was obtained between the whitefly population and (%) disease incidence of TYLCV. Whitefly population and yield of tomato were negatively correlated with each other. The yield was also found significant negatively correlated with the percentage of TYLCV disease incidence. th