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Rearing of corcyra cephalonica

Dr. M.K.NAYAK SUKHLAL MANDLOI

DEPARTMENT OF ENTEMOLOGY KRISHI MAHA VIDYALAYA, TIKAMGARH, (M. P.)

Roll No. 5783

Rearing of corcyra cephalonicaThe larvae of C. cephalonica can be reared on

cumbu grain.Heat sterilization broken cumbu grain @2.5 kg along

with 100 g of groundnut powdered yeast tablet are taken in a wooden or plastic trays (45cm×30cm×10cm)

Streptomycin sulphate 0.05% spray is given@10 to 20 ml per tray to prevent bacterial infection.

Corcyra eggs @o.5 (8000-9000 eggs)/ tray uniformly mixed in cumbu medium and the trays are covered with kada cloth, secured by rubber band.

The hatching larvae feed on the grain by webbing and larvae period lasts for 30-35 days.

The population takes place inside the web itselfe.

The pupal period lasts for 5-7 days and adult moths emerge after 30-45 days from the data of egg inoculation.

The emerging Corcyra adults are collected every morning and transferred to a specially designed mating drum made of G.I. with wire mesh bottom where they are provided with honey solution as food.

The eggs are collected at the bottom on a blotting paper kept in a tray.

The eggs are cleaved with sieves or eggs separator.One cc of egg will contain approximately 16,000 to

18,000 eggs. About 100 pairs of Corcyra moth will produce 1.5 cc

of eggs during the four days of egg laying period .

From each culture tray a maximum of 2500 moths can be obtained.

A tray can be kept for about 90 days for collection of adult moths due to staggered development .

Mass culturing of egg parasitoid Trichogramma The eggs of Corcyra are sterilized by exposing to

UV light (15 W for half an hour to kill embryo and are sprinkled uniformly on large egg cards (30 cm × 20 cm) divided into 30 rectangles (7 cm × 2 cm ) by drawing lines containing a thin layer of gum @ 6 cc /card .

These cards are taken in large polythene bags (45 cm × 30 cm ) containing nucleus egg card at a ratio of 1:6 to fresh eggs and exposed for 2 days.

They are kept for another 2 days at room temperature and on fourth day parasitised eggs turn black in colour.

At this stage , the parasitized egg can be used for field release or stored at 10°C for a fortnight .

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