ARS | Publication request: CUCUMBER GERMPLASM RESISTANT TO CLADOSPORIUM CUCUMERINUM

Submitted to: HortScience
Publication Type: Research Notes
Publication Acceptance Date: January 15, 2004
Publication Date: February 15, 2004
Citation: Park, Y., Havey, M.J. 2004. Cucumber germplasm resistant to cladosporium cucumerinum. Hortscience.

Technical Abstract: Scab is an important disease of cucumber (Cucumis sativus) caused by Cladosporium cucumerium. A total of 188 cucumber plant introductions (PIs) were evaluated for scab resistance using hypocotyl inoculations. Susceptible plants developed large sunken lesions on hypocotyls and most seedlings collapsed 4 to 5 days after inoculation. Resistant plants showed either no symptoms or shallow tan lesions on hypocotyls. Among the 188 PIs, 27 had high frequencies of resistant plants (mean DSI < 3) and 161 PIs possessed primarily susceptible plants (mean DSI > 5). Eight PIs (NSL 5731, 255933, 264666, 264667, 306785, 342951, 354952, 458845, and 535881) showed no symptoms (DSI = 0.0). PIs possessing only resistant plants tended to be from northern countries and represent important sources of scab resistance.