A LUCERNE-WHEAT GERM DIET FOR REARING THE COTTON BOLLWORM, HELIOTHIS ARMIGERA (HUBNER)
Wu KUN-JUN (Institute of Zoology, Academia Sinica)
An artificial diet with lucerne, including flowers and leaves, and wheat, germ as the basic ingredients was developed for rearing the cotton bollworm Heliothis armigera (Hubner) in successive generations. Diet-fed larvae developed faster than those reared on cotton plants and the survival rate of the larvae on the diet was about 20% higher than that on the host plant. The female moths from the diet-fed larvae laid more eggs than those from cotton boll-fed larvae, although the percentage of egg-hatching in the diet-fed insects was a little lower than those in the cotton boll-fed insects.H. armigera has been reared continuously for 16 generations on this diet. In this culture the percentage of newly hatched larvae reaching the adult stage ranged between 77% and 94%. The averaga number of eggs laid by the female moths from diet-fed larvae exceeded 1000 and the percentage of egg-hatching was not lower than 70%.