It would depend on how closely the artificial food emulates the nutrients, vitamins, proteins, etc., that occurs in natural Mulberry leaves. Most likely, your silkworms would do just fine.
As for the above poster, XIN W, you have been reported to Yahoo for repeated spam/advertisement.
XIN W – Your online store carries poor quality and cheaply made items.
I wouldn’t purchase *anything* from you, as I’d be afraid I’d lose my hard earned money to a scam artist like yourself.