Commercial Disease Controls
The Pennsylvania State University
Cooperative Extension

Spinach

Seed Treatment

Use seed treated with Maxim 4FS (0.08-0.16 fl. oz/100 lb seed) for Rhizoctonia & Fusarium control and Apron XL LS (0.16 to 0.64 fl.oz/100 lb seed for Pythium control.

Disease Control

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 90degF (32.2degC) 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 switching 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).

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.