But no conclusive leads surfaced. Putting PCR to work has greatly speeded up the process, eliminating insect specimens that may never have carried the disease in the first place. Taking Action At best, spraying insecticide is a short-term solution. It can be costly to growers and endanger beneficial insects such as bees. To find alternatives, the researchers have begun evaluating a few seedless watermelon varieties, called triploids, that have resistance or tolerance to yellow vine disease.
Most melons planted now are seeded varieties.
That's chiefly because they germinate more readily, though the plants are highly susceptible. But once that plant gets going and establishes itself, it's one of the most vigorous growing, productive plants there is. The scientists hope to locate the specific gene or genes that help resistant melons stave off the BLO's intercellular assault. This raises the prospect of developing new, resistant, seeded varieties. On another front, they are exploring planting a few rows of insecticide-treated squash plants as a protective barrier around a melon crop.