Commercial Disease Controls
The Pennsylvania State University
Cooperative Extension

Parsnips

Disease Control

Damping-Off
Apply the following preplant incorporated or as a soil-surface spray after planting.

Ridomil Gold-- 1-2 pt 4E/A

Leaf Spot, Canker, and Mildew
Rotate to allow 2 years between parsnip plantings. Use well-drained soil with a pH of 7. Ridge soil over shoulders to prevent infection. Begin sprays at the first sign of disease. Repeat no more than three times at 10-day intervals.

Alternate:
chlorothalonil (Bravo,Echo, Equus)-- 1.5-2 pt 6F/A or OLF with:

azoxystrobin (Quadris--9.2 - 15.4 oz 2.08F/A or Amistar--3-5 oz 80WDG/A), or
Cabrio--8-12 oz 20EG/A
(do not make more than one consecutive application of Amistar, Quadris or Cabrio)

Note: Where trade names are used, no discrimination is intended and no endorsement by the Cooperative Extension Service is implied. Information provided is intended for consideration by the user, but is not intended to be a recommendation. Production decisions should be based on consideration of many types of information (scientific, experiential, economic, legal, etc.) available to the user.