UC research finds 7 more plant families that host cucurbit disease
What Has ANR Done?Eric Natwick, UC Cooperative Extension entomology advisor in Imperial County, and William Wintermantel of USDA Agricultural Research Service in Salinas, studied potential hosts in the desert melon production regions of California, Arizona and northern Mexico. They collected samples of possible non-cucurbit host plants from areas in and near melon fields in Imperial Valley. This study revealed a broader host range than originally believed for CYSDV, including the identification of non-cucurbit hosts that can serve as source plants for whitefly to transmit CYSDV back to melon and other cucurbits. At least one plant of the following species tested positive for the presence of CYSDV: alfalfa, snap bean, romaine lettuce, sowthistle, Wright’s ground cherry, silverleaf nightshade, alkali mallow, common mallow or cheeseweed, lambsquarters, redroot pigweed, five hook bassia and London rocket.
IPM strategy can be developed based on the expanded CYSDV host rangeThere were CYSDV hosts represented in seven new distinct non-cucurbit families. The demonstration that CYSDV can be acquired by whitefly vectors from non-cucurbit hosts and efficiently transmit the virus back to cucurbits illustrates the potential niche these plants may fill during seasons when melon and other cucurbits are not widely prevalent. The new information on additional non-cucurbit host families is now being used to develop CYSDV management strategies.
Supporting Unit: Imperial CountyEric Natwick, entomology farm advisor, 1050 E. Holton Rd, Holtville 92250 Cell (760) 996-1385, firstname.lastname@example.org