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ARS Home » Southeast Area » Charleston, South Carolina » Vegetable Research » Research » Publications at this Location » Publication #89251
Title: ADDITIONAL EVALUATIONS OF MELON GERMPLASM FOR RESISTANCE AGAINST DOWNY MILDEW

Author
item Thomas, Claude

Submitted to: Downy Mildew Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 3/8/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: To identify potential new sources of resistance in melon against downy mildew, Pseudoperonospora cubensis (Berk. & M.A. Curtis) Rostovzev, an additional 1076 Cucumis melo L. U.S. Plant Introductions (PI) and four control cultivars were evaluated using artificial inoculations. All PIs were first evaluated under field conditions and a disease index (DI) was calculated for each entry which had one or more resistant plants evidenced by expression of a reaction type (RT) of 2 or higher. All PIs with one or more plants expressing a RT equal to or greater than 2 in field tests were further evaluated in replicated greenhouse-dew chamber tests. Based on DI, PIs 271329, 307588, 313970, 315410, 370021, 378062, 401643, and 401644 were resistant (DI = 2.6, 3.0, 3.3, 2.7, 3.1, 3.0, 2.5, and 2.8, respectively). Resistant plants exhibiting RT 3 were identified in 68 accessions, and 100 accessions had moderately resistant RT 2 plants.