Annals of Plant Protection Sciences

Higher level of leaf miner (Liriomyza trifolii) infestation was maintained from late March to late May when average temperature, R.H., sunshine hr/day and total rainfall ranged from 21.60–27.23°C, 65.39–80.25%, 3.39–8.49 hr/day and 375.30 mm, respectively. Temperature, minimum R.H. and rainfall showed significantly positive correlation with leaf miner incidence while non-significantly positive correlation with average R.H. Temperature and R.H. gradient showed significantly negative correlation. Duration of life cycle were longer (22.22 days) during February–March and being shorter (15.68 days) during relative warmer month (April) of the crop growing season. All the developmental stages and life-cycle of the pest species were negatively correlated with temperature and relative humidity. Relatively higher temperature and R.H. as prevailed during April favoured in rapid multiplication of the pest through shortening of life cycle which was reflected in higher level of infestation during the period under field conditions.