Nematode infestation, a potential threat to Indian forests

Abstract

Nematode infestation in the forest flora has remained a neglected area of research in India. The limited information available on this aspect shows that plant nematodes pose a serious threat to forest plants. The ectoparasitic nematodes being integral component of soil fauna, are an important cause of concern for forest flora because of their unrecognizable and debilitating impact that leads to a slow tree decline and dieback. Endoparasitic nematodes, such as root-knot nematode, pine wilt nematode, flower bud and leaf gall nematode inflict specific symptoms and serious plant damage. Further, there is a potential risk of introduction of pine wilt nematode in the Himalayan region under Indian territory, through the import of coniferous wood and wood products from the nematode prone countries especially from China directly or via Nepal, Bhutan, Myanmar etc. The situation warrants immediate attention of plant pathologists and nematologists to ascertain the status of nematode infestation in forest flora in the country and to formulate specific recommendations for an immediate line of action by the government agencies. The present review through B. B. Mundkur Memorial Award lecture has offered me an opportunity to highlight the significance of nematode infestation in India forests, before a wide and relevant scientific fraternity of the country.