A report on the relative abundance of tylenchida, dorylaimida and mononchida population of guava orchards in 24-Parganas (South), West Bengal, India

The relative abundance of dorylaimids, tylenchids and mononchids fauna in a guava orchard, situated at Shalipur (West) in Baruipur Subdivision, South 24-Parganas district, West Bengal, India was observed. In this orchard the population of two genera of Tylenchida, three genera of omnivorous and predatory Dorylaimida and three genera of Mononchida were counted at one month interval from May, 2004 to April, 2006. The population of dorylaimids and tylenchids were greatly increased in the month of July along with the population of mononchids. However in the rest of the period during these years, population densities of tylenchids and dorylaimids remained comparatively low with little fluctuations. Positive correlations were observed between tylenchids with mononchids, omnivorous and predatory dorylaimids as well as with the combined population of omnivorous and predatory nematodes. The tylenchids nematodes maintained parallel population abundance with that of the omnivores and predators without showing any reduction in population density, which was evident from the regression analysis.