| Lymantria dispar L. is an important worldwide pest. It has a wide distribution, a large range of foods, can cause serious damage and often comes to effect periodically. In order to reproduct virus out of L.dispar larvae ,we have fed them on man-made foods and made contrast with matural leaves of Quercus mongolica. The feeding effect of natural leaves and man-made foods is: the first-instar larva period are 12-day and 15-day, the second is 6-day, the third is 6-day , the fourth are 6-day and 7-day respectively, the fifth are 8-day and 9-day,and the sixth is 14-day,all the larvae period are 52-day and 57-day respectively. The head-width of every-instar larva feeding on natural leaves are 0.580mm, 1.128mm, 1.781mm, 3.072mm, 4.300mm, 5.215mm respectively, and the head-width which fed on man-made foods are 0.594mm, 1.179mm, 1.594mm, 2.760mm, 5.086mm, 6.234mm respectively; The length of every-instar larva feeding on natural leaves are 5.40mm, 9.26mm, 13.90mm, 23.50mm, 31.20mm, 36.3mm respectively, and the length which fed on man-made foods are 4.74mm, 9.45mm, 14.00mm, 22.90mm, 35.20mm, 38.00mm; The male pupa gravity of L. dispar which fed on natural leaves and man-made foods are 0.58g and 0.72g,and the female's are 0.87g and 1.53g. We have studied the product technology and forest application of LdNPV. The effect indicates that both natural foods and man-made foods can satisfy larvae's growth and development. Furthermore, they can also be used of producting NPV. Yet reproducting virus with man-made foods can prevent from other microbes polluting easily, and can't be restrict by seasons. Moreover, they can provide forestry production with a great deal virus agent. The effect that controlling L.dispar larvae with virus agent (consistence:2.623 X 107PIB/ml) is 77.80%.
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