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Grafting offers a great potential in organic heirloom tomato production because of the enhanced vigor and disease resistance in grafted plants.This practice, however, has not been popular among small farmers in the United States.The objective of this preliminary study was to evaluate the performance of grafted heirloom tomatoes in high tunnels where Southern Blight (Sclerotium rolfsii) and Root-knot Nematodes were present in soil.