Damping-Off.
Apply the following preplant incorporated or as a soil surface spray after planting:
mefenoxam -- l-2 pt Ridomil Gold 4E/A or 2-4 pt Ultra Flourish 2E/A
Downy Mildew (Blue Mold) and White Rust.
Rotate away from spinach for at least 2 years. Use resistant varieties. Do not plant spring crop near overwintered fields. The use of mefenoxam at planting for damping-off control will provide early season control. Beginning 2 to 3 weeks after emergence (prior to symptom development), apply the following on a 7- to 10-day schedule (do not use if temperature is 90°F (32.2°C) or above). Copper containing fungicides may cause some phytotoxicity.
Actigard--.075 oz 50WG/A, or
azoxystrobin (Quadris--6.2 - 15.4 oz 2.08F/A or Amistar--2-5 oz 80WDG/A. For downy mildew use a minimum of 4 oz 80WDG/A) or
Cabrio--12-16 oz 20EG/A, or
Aliette -- 3 lb 80WDG/A, or
Kocide -- 2 lb 61DF/A, or
Ridomil Gold Copper -- 2.5 lb 7OWP/A (14-day schedule)
The FRAC group 11 fungicides; Quadris, Amistar, and Cabrio should not be applied more than twice before swtiching to a fungicide with a different mode of action.
Leaf Spots and Anthracnose.
These diseases can be prevalent in overwintered, second, and third cut fields. Apply the following as soon as symptoms appear in the spring or shortly after cutting and repeat every 7 to 10 days. If more than 2 applications are needed, apply a copper fungicide prior to making a third application.
azoxystrobin (Quadris--6.2 - 15.4 oz 2.08F/A or Amistar--2-5 oz 80WDG/A), or
Cabrio--12-16 oz 20EG/A, or
Blight (Cucumber Mosaic Virus)
Use resistant varieties (MR).
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.
Where trade names are used no discrimination is intended, and no endorsement by the Cooperative Extension Service is implied.
Dr. Alan A. MacNab, Professor, Plant Pathology
Penn State College of Agricultural Sciences
211 Buckhout Lab, University Park, PA 16802
Updated: Nov, 2005; EMH
Loaded: Nov, 2005; EMH