Assuming the rest of the recipe is a safe one then there are no safety issues with the ginger substitution. But I wouldn't sub 1 tsp of ground for 1 tsp of grated as the ground is much finer texture so measures differently. Maybe 1/2 tsp ground?

Dave

The recipe is from the Ball Complete Book, I think it's safe. ;^)

Thanks for the advice on the measurement.

Ground ginger is a POOR substitute for fresh grated ginger. Where I live it is available at every market in town.
Jim in So Calif

It wasn't a matter of availability, but a matter of unwillingness to purchase for a single recipe. I can understand why you would defend fresh ginger though. ;^)

Eaglesgarden: I guess because I am a cook and a person with taste.
I am not defending ginger anymore that I would "defend" any other important ingredient in a recipe. Boy, I could really run with this ball into ridiculousness.
If you replace a particularly significant taste (as fresh ginger is) with something that tastes completely different (powdered ginger), you will not get the same flavor results.
Try making your next BBQ steak out of beef jerky! If you have never eaten a steak, the dried jerky might taste OK.
If you are concerned about buying a knob of ginger (about 25 cents here), and having the balance go to waste, you may freeze it and grate it frozen into dishes you might make. It combines well with chicken dishes and chicken stock, a variety of pork dishes, and any number of Asian dishes.
After tasting a small amount, you will have an idea of what it might go with (pairs wonderfully with pineapple).
Jim in So Calif

I too would not substitute. A friend of mine once tried to substitute ground ginger for the root in a recipe I gave him for sesame noodles. It turned out terrible.

jimnGINGER,

I was making a joke, since your handle includes the word/name "ginger". I understand that substitutions alter the flavor. My concern was not with the flavor, but the safety. I appreciate your advice concerning ginger root, and will consider it more seriously in the future.

Eaglesgarden,
Now I feel dense!
My wife's nickname is Ginger.
I did NOT even make the connection between the question and my handle.
Jim in So Calif

Not to worry, Jim. We all have our moments. :^)