Novel Watermelon Rootstock Knocks Out Disease and Pests

CHARLESTON, SOUTH CAROLINA —A new watermelon line, developed by Agricultural Research Service (ARS) and Clemson University scientists, gets to the root of the problem of a major disease and pest of watermelon crops in the southern United States.

Carolina Strongback is a rootstock watermelon that is resistant to Fusarium wilt and the southern root-knot nematode, according to William “Pat” Wechter, plant pathologist with the ARS U.S. Vegetable Research Laboratory (USVL) in Charleston, South Carolina. Fusarium wilt, a soilborne disease that threatens vegetable crops, can stay in the soil for 30 years or longer, and fumigants used to control it are no longer available, he added.  In addition, watermelon is extremely susceptible to nematodes, which are especially brutal on crops in the Southeast.

Susceptible watermelons can be grafted onto resistant rootstocks of other vegetables such as squash and pumpkin to control certain pathogens, Wechter said. Grafting, which has been used in other countries for years, is a new concept in the United States.  Some watermelons grafted to squash rootstock have shown to be resistant to Fusarium wilt, but they were susceptible to southern root-knot nematode.

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