Downy mildew of broccoli, caused by the fungus Peronospora parasitica, is a perennial disease problem affecting winter broccoli production in Arizona. During 1985-87, potential systemic fungicides were evaluated in the field for disease control. In the 1985-86 season, a period of high disease incidence, lesion development was significantly reduced by fosetyl-Al (44 %), phosphorous acid (42 %), oxadixyl + mancozeb (35 %), chlorothalonil (33 %), metalaxyl + mancozeb (30 %) and metalaxyl + chlorothalonil (28 %). During the 1986 -87 growing season, disease incidence was low and lesion development was significantly reduced by phosphorous acid (82 %), fosetyl -Al or oxadixyl + chlorothalonil (77 %), metalaxyl + chlorothalonil (68 %) and chlorothalonil (54 %). Fosetyl-Al, phosphorous acid and oxadixyl were as effective as currently available fungicides ( metalaxyl and chlorothalonil) for control of downy mildew of broccoli in Arizona.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/221432 |
| Date | 05 1900 |
| Creators | Matheron, M. E., Matejka, J. C. |
| Contributors | Oebker, Norman F., Kingdon, Lorraine B. |
| Publisher | College of Agriculture, University of Arizona (Tucson, AZ) |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Article |
| Relation | Series P-70, 370070 |
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