Abstract: Lobesia botrana (Denis & Schiffermüller) is a newly invasive plant quarantine pest in Turpan, China. The effects of multiple fungus on the surface of grape fruits on the growth and development of L. botrana was investigated in this study. The fungus in moldy grapes were isolated and cultured, and then inoculated onto fresh grapes. After the moldy layer grew out from the inoculated grapes, L. botrana was reared individually on the grapes. The growth, development, and fecundity of the insects were measured. Botrytis cinerea and Aspergillus niger principally affected the growth L. botrana 4^th and 5^th instar larvae. The growth indexes of pupae fed on grapes inoculated with B. cinere and A. niger did not differ between each other but were significantly higher than those on healthy grapes. The developmental duration of L. botrana larvae reared with grapes with B. cinerea and A. niger was significantly shorter than that of the insects reared with healthy grapes, but the adult duration and male and female adult longevity were to the opposite, and sex ratio showed no difference between the two groups of insects. The fecundity (32.40 eggs/female) of L. botrana reared with B. cinerea-infected grapes was significantly higher than that of the insects reared with A. niger-infected grapes (24.15 eggs/female) and with healthy grapes (27.3 eggs/female). And the 3^rd and 5^th instar larvae preferred gray fungus-infected grapes more. These results show that both B. cinerea and A. niger can promote the growth of L. botrana larvae, but only B. cinerea can enhance fecundity.

Key words: Lobesia botrana, Botrytis cinerea, Aspergillus niger, growth and development