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United States Department of Agriculture

Agricultural Research Service

Title: Fungicide Control of Foliar and Fruit Diseases of Muscadine Grape (Vitis Rotundifolia MICHX.)

item Smith, Barbara
item Magee, James

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 1999
Publication Date: N/A

Technical Abstract: Control of muscadine fruit diseases is especially important when berries are to be marketed fresh. Fungicides currently registered for use on grapes were applied to five cultivars at 10 to 20 day intervals from early bloom (mid-May) until just before harvest (late August). The nine foliar spray applications included propiconazole (2), captan (3), benomyl (1), and azoxystrobin (3). Berries from treated vines had lower bitter rot (Greeneria uvicola), ripe rot (Colletotrichum sp.), macrophoma rot (Botryosphaeria dothidea), and total berry disease scores (DS) than berries from untreated vines. Fruit from the untreated vines of Noble, a dark-fruited, disease resistant cultivar, had the lowest total berry DS (19) while fruit from Higgins, a bronze-fruited cultivar, had the highest (77). Cowart (dark), Carlos and Summit (bronze) fruit received intermediate total berry DS. Fungicide treatments reduced the total berry DS of Noble to 18 and that of Higgins to 44. Untreated Noble vines received the highest total foliar DS while Cowart, Summit and Carlos received the lowest DS. Late-season foliar DS of fungicide treated vines (2.5) was much lower than that of untreated vines (5.2). These results indicate that regular fungicide applications during the growing season will reduce both fruit and foliar diseases.

Last Modified: 4/22/2015
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