Seasonal dynamics of gall midge (Orseolia oryzae Wood-Mason) and its parasites in rice at Rajendranagar, Hyderabad, India.
Studies carried out on the population dynamics of the rice pest Orseolia oryzae at Rajendranagar, Andhra Pradesh, India, over 4 years showed that the pest appeared in late August, its incidence reached a peak in October and declined by December. The activity of its parasitoids (Platygaster oryzae, Platygaster sp., Propicroscytus mirificus and Eurytoma setitibia) closely followed that of the host, increasing slowly to reach a peak in October-November. However, parasitism declined more slowly than did host activity. Average parasitism between September and December was highest (45.1%) in 1985 and lowest (34.6%) in 1982.