Abstract
Tea aphid, Toxoptera aurantii (Boyer de Fonscolombe) infests the tender leaves and young shoots of the tea plant. Camellia sinensis and its occurrence has been observed while monitoring the pest invasion in a tea garden located at Senapati district. Manipur. Under the local climatic conditions, T. aurantii infests tea from April to October and its population density density varies with respect to climatic factors and abundance of syrphid predators. Random sampling of their population showed that their density varied from 12 to 175 aphids! Scm length of the twig, with maximum density in August and September. The syrphid species, Episyrphus balteatus (De Geer) and Ischiodon scutellaris (Fabricius) were encountered and their occurrence synchronized well with that of tea aphid. The feeding voracity of the predator was nearly ISS aphids per syrphid larva. The biology, feeding efficiency and the population status of the predatory species are discussed in the context of the abundance of tea pest.
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