Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Entomophthora fumosa Speare, an entomogenous fungus on rice brown planthoppers.

Abstract

In September-October 1975 and 1976, high mortality was observed in laboratory populations of Nilaparvata lugens (Stal) at the International Rice Research Institute, Cuttack (in the Indian State of Orrisa), and the causal agent was found to be a species of Entomophthora, most probably E. fumosa. It was favoured by high relative humidity (80% RH) and temperatures of 25.6-32.6 deg C; it caused more mortality among adults than nymphs and among females than males. Infected planthoppers showed reduced appetite and mobility, and finally became inactive and were either stuck to the leaf-sheath by the fungus (which emerged through the intersegmental membranes of the abdomen and leg joints) or floated as balls covered by the fungus in the standing water of the rice-fields. E. fumosa is known from Planococcus citri (Risso) (Pseudococcus citri), and other species of Entomophthora have been reported from N. lugens, but this is the first record of E. fumosa from N. lugens.