Smokerbill
Crossing the Road
I bet that would work with tomatoes too. Pick off the little ones as the season is ending.When I've grown melons, I do this:
Around the first week of August, I remove any melon that is not as big as my fist. If it isn't that size by then, it won't ripen by frost anyway. By getting rid of those (useless) melons, the plant pumps more energy into the melons that will ripen. They get bigger and sweeter.