Suresh Kumar Mahala, M.K. Mahla, Hemant Swami, S.S. Lakhawat, Devendra Jain and Pokhar Rawal
Abstract
A survey was conducted during 2024 and 2025 to study the abundance and host association of white grub beetles in southern Rajasthan. The results revealed that Holotrichia consanguinea was the dominant species across all surveyed districts, followed by Holotrichia serrata and Holotrichia fissa. Beetle abundance was comparatively higher during 2025, with Banswara recording the maximum population during both the years. Peak emergence and activity of beetles were observed during July and August, indicating strong association with the monsoon season. Neem was identified as the most preferred host plant for all the three species, while ber, mulberry, drumstick, guava, tamarind, palash, babul and henna also served as important host plants depending on locality. Variations in species abundance and host association among districts and years were mainly influenced by rainfall, temperature, vegetation diversity and habitat conditions. The study concluded that seasonal factors and host plant availability play a significant role in determining the distribution and abundance of Holotrichia beetles in southern Rajasthan.