Sally,
You can do a search for "non-bee pollinators" which might give you some answers. I'm not at all up to speed on how a lot of plants are pollinated, but always fall back on the customary "honeybee as primary pollinator" idea. I know some plants are self-pollinating and many are pollinated by other insects or even the wind. I'd be curious to see what answer you come up with or perhaps someone on the forum has an idea or personal experience. We haven't had apple trees on the property for several years.
