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Gold fringed borer (GFB), Chilo auricilius (Dudgeon)
Distribution: This is an important pest of sugarcane and rice. The distribution range of C. auricilius overlaps with that of its look-alike C. polychrysus. It is also found in West Bengal, Bihar, UP, Gujarat, Jammu & Kashmir.
Description: The adults resemble the adults of C polychrysus and can be distinctly differentiated by their genitalia and larvae by thoracic chaetotaxy. The forewings are 8-13 mm long, with yellow or occasionally brown colour, and are variably ornamented with brown scales. A discal spot is present and there are rows of sub-terminal and median metallic scales. There are also a few small silvery specks in the middle of the wing, the terminal dots are large and the fringe is shiny gold. Coloration and pattern of silver specks on forewing is variable. In some cases the forewings are uniformly yellow. The hindwings are light brown. The silvery specks are sometimes irregularly dispersed, while in other specimens they form two parallel transverse lines. First-instar larvae are about 1 mm long and creamy-white, with a black, dorso-ventrally flattened head. A full grown larva is cream to dull in colour; head dark fuscous, body with 5 violet stripes. The crochets on the abdominal prolegs form a complete circle.
Biology: Eggs are laid on the under surface of the rice plants and at times also on the leaf sheaths. The oviposition period is 3 days and nearly 123 eggs are laid per female. The eggs hatch in 5-7 days. The larval period varies from 30- 32 days undergoing six moults. The pupal period is for 6 days. The postero- lateral and postero -dorsal spines on cremaster of pupae are more prominent. There are 5-7 generations in India.
DRR Technical Bulletin No. 59/2011, Rice stem borers in India: species composition and distribution