Septoria leaf spot of celery

Spetoria leaf spot of celery (Septoria apiicola) is a blight of celery, which is extremely susceptible to the disease during extended periods of leaf wetness.

Symptoms
Septoria apiicola can attack any part of the plant above ground. As outer leaves and stalks turn dark and wither, the entire field may look scorched.

Biological
This fungi often are introduced on 1-year-old seed. For this reason, use seed 2 years old or older. Soak newer seed at 47°C (118°F) for 30 minutes; then dry at room temperature.

Chemical
Spray plants with one of the following fungicides on a 7-day schedule in the field, and if the label permits, at shorter intervals in seedbeds.
 * Quadris 9.2-15.4 fl oz/A, 7-14 day intervals (0 days-PHI). Follow label recommendations for fungicide resistance management.
 * Quadris Opti 2.4-3.7 pt/A (7 days-PHI).
 * Bravo Ultrex 0.9-1.4 lb/A, 3-5 day spray schedule or 1.8-2.7 lb/A, 7-day schedule (7 days-PHI).
 * Bravo Weather Stik 6F 1-1.5 pt/A, 3-5 day spray schedule or 2-3 pt/A, 7-day schedule (7 days-PHI).
 * Equus 720 2-3 pt/A (7 days-PHI).
 * Tilt 4 oz/A (14 days-PHI).
 * Quilt 14 fl oz/A on a 7-10 day schedule (14 days-PHI).
 * Kocide 3000 0.75 lb/A (0 days-PHI). Apply at 5-7 day intervals as soon as plants are established in the field.
 * Cuprofix Ultra 40 D 1.25 lb/A. Apply at 5-7 day intervals when conditions favor disease.
 * Tanos 8.0-10.0 oz/A (1 day-PHI)