Impact of different weather parameters on thrips population (Thrips parvispinus Karny) in chilli

This study investigates the relationship between thrips population dynamics and weather parameters in chilli (Capsicum annuum) at the HRS Lam experimental location. Over a period from January to April, the thrips population showed a significant negative correlation with morning relative humidity (-0.673**) and evening relative humidity (-0.372**), suggesting that higher humidity levels may suppress thrips proliferation. Conversely, temperature (mean, minimum, and maximum) exhibited a positive but non-significant correlation with thrips abundance, supporting earlier studies that link warmer temperatures to higher pest activity. A negative correlation between wind speed and thrips population was observed, though it was not statistically significant. Additionally, sunshine hours showed a positive correlation with thrips numbers, which is consistent with findings from previous research. Regional variation in peak thrips activity is discussed in relation to ecological conditions, transplantation dates, and differences in chilli variety resistance. The results underscore the potential of developing weather-based pest prediction models, aiding in timely pest control interventions. Understanding the interplay between weather conditions, thrips behaviour, and chilli plants will help optimize pest management strategies, especially in regions with varying environmental factors.