In general anything that grows below ground is higher in starches/sugars than the green things that grow above ground.Have a look in the Food forum and you will find lots of info.Also the Collins Gem carb counter book is invaluable for telling you the amount of carbs in various fruit /veg etc.
So,such things as potatoes,carrots,parsnips should be either avoided or eaten in very small portions.
As for the fruit I suggest again the Collins gem Carb or GI book.It depends on the size of pack as to what the carb count is!!!