Commercial Disease Controls
The Pennsylvania State University
Cooperative Extension

Garlic

Disease Control

Damping-off
Apply the following in a 7-inch band after seeding. Use formula given in the "Calibration for Changing from Broadcast to Band Application" section of Calibrating Granular Application Equipment to determine amount of Ridomil Gold needed per acre.

Ridomil Gold--O.5-1 pt 4E/A

White Rot
At planting time, apply a furrow treatment of Rovral 5OWP (4 pounds in 50 to 100 gallons per acre, based on a 38- to 40-inch row spacing); spray both the cloves and the covering soil used to fill the furrow. In treated fields, do not grow crops other than garlic and leafy vegetables during the harvest year, and do not grow garlic, leafy vegetables, tomatoes, root crops, cereal grains, or soybeans during the following year.

Botrytis Leaf Blight (Blast)
Apply one of the following when conditions favor disease development and repeat twice at 7- to 10-day intervals.

chlorothalonil (Bravo, Echo, Equus)--1.5 to 3 pt 6F/A or OLF, or
Endura--6.8 oz 70W/A, or
Pristine--14.5-18.5 oz 38WG/A

Purple Blotch and Downy Mildew
Apply one of the following when conditions favor disease development and repeat twice at 7- to 10-day intervals.

Forum--6 oz 4.18SC/A (for downy mildew only; must be tank-mixed with chlorothalonil), or
azoxystrobin (Quadris--6.2 - 12.3 oz 2.08F/A for Purple blotch or 9.2 - 15.4 oz 2.08F/A for downy mildew or Amistar--2-4 oz 80WDG/A for Purple blotch or 3-5 oz 80WDG/A for downy mildew), or

Cabrio--8-12 oz 20EG/A, or
chlorothalonil (Bravo, Echo, Equus)--1.5 to 3 pt 6F/A or OLF, or
Endura--6.8 oz 70W/A, or
Pristine--18.5 oz 38WG/A

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.