Disease Control & Fungicide Use Precautions (PDF, 12 KB)
The most effective treatment timing is usually after the flag leaf is fully emerged and before bloom. Wheat with at least 60 bu/ac yield potential is most likely to respond to fungicide treatment. Treat powdery mildew if 20% of leaf area infected on leaf below flag leaf, and cool (high < 75 F), wet weather predicted.
NOTE: Treating mildew before the flag leaf is fully emerged will reduce residual control of rust, glume blotch, and tan spot.
Leaf Rust susceptible varieties usually must be treated preventatively or at the first sign of rust because fungicides can’t be applied later than flowering. Rust usually develops later than this.
Treat for leaf/glume blotch or tan spot if 25% of stems have a lesion on leaf below flag leaf.
We do not know yet if stripe rust will become an economic problem in S. C. Stripe rust is a very aggressive disease which responds best to preventative treatment of the emerged flag leaf. For rescue treatment of stripe rust (not common leaf rust) use Tilt.
|Product||Rate Fl oz/Ac|
|Quadris 2.1 F
|Stratego 1.0 lb
|PropiMax EC||4 oz|
Note: Fungicide seed treatments provide relatively cheap stand insurance and smut protection.
|Product||Rate Fl oz/100 lb Seed|
|RTU Baytan-Thiram||4.5-9.0 oz|
|Dividend XL RTA1||5.0-10.0 oz|
|Gaucho XT3||3.4-4.6 oz|
|RTU Vitavax-Thiram||2.0-4.0 oz|
1. Grower and commercially applied available.
2. Raxil formulated in various combinations with other fungicides,insecticides.
3. Gaucho XT also control aphids and gives some Hessian fly suppression.