This field scouting guide concentrates on silverleaf whitefly or sweetpotato whitefly which transmits three important viruses in cucurbits: squash vein yellowing virus, cucurbit leaf crumple virus, and cucurbit yellow stunting disorder virus.
Whitefly vectored plant virus
A number of whitefly-transmitted viruses, including cucurbit leaf crumple virus, cucurbit yellow stunting disorder virus, cucurbit chlorotic yellows virus, and squash vein yellowing virus, are able to infect and cause losses in cucurbit crops.
South Florida pest and disease hotline | September 2023
Virus, whitefly, Gummy Stem Blight, Pythium, Choanephora, and other pest reports from University of Florida
Whitefly management in Melons | Fall 2023
In September 2023, University of Arizona Cooperative Extension, Integrated Pest Management specialists published a list of pesticides and the relative efficacy index of each product on adult and nymph whiteflys.
Whitefly Management in Melons
The sweetpotato whitefly, Bemisia tabaci, can cause significant melon crop losses and result in excessive insecticide use. Adults and nymphs feed on the undersides of melon leaves by inserting their piercing/sucking mouthparts into vascular tissue and extracting plant juices that will reduce fruit quantity and size. Image and article by: John C. Palumbo, Associate Research Scientist of vegetable crops at the University of Arizona’s Yuma Agricultural Extension Center.
Whitefly populations low across Southeast
Whiteflies can cause feeding injury issues in vegetables and transmit multiple viruses. These include cucurbit leaf crumple virus, cucurbit yellow stunting disorder virus, cucurbit chlorotic yellow virus, squash vein yellowing virus and tomato yellow leaf curl virus. Vegetables like squash, zucchini, cucumber, and cantaloupe are highly susceptible to these viruses.
CucCAP scientists use multiplex system to monitor virus threats to melon crops in California and Arizona
The Wintermantel team developed a multiplex single-step RT-PCR method to simultaneously test and differentiate among the among different viruses. Sampling of melon production regions in California and Arizona found that different combinations of viruses were dominant in fall vs. spring seasons, providing important information for disease management in areas impacted by cucurbit yellowing viruses.
Whitefly population remains low in Georgia
Vegetables like squash, zucchini, cucumber and snap beans are susceptible to viruses transmitted by whiteflies.
South Florida pest and disease hotline | March 2023
UF/IFAS entomologists report high whitefly populations on all crops. Scouts are reporting increasing whitefly pressure on vegetable crops with silverleaf symptoms showing on squash.
