Wheat Fungicide Update

Wheat Fungicide Update

May 1, 2009

Product Updates

The Environmental Protection Agency has approved new guidelines for application of the Syngenta Crop Protection fungicides Quilt and Tilt on wheat. Both fungicides can be applied up to Feekes growth stage 10.5 (full heading). The 45-day pre-harvest interval restriction has been removed.

 

Two new fungicides are now registered for control of Fusarium head blight (scab). These fungicides are Prosaro (Bayer CropScience) and Caramba (BASF Ag Products). The optimum application timing for control of Fusarium head blight is early to 50% flowering.

The re-entry interval for Stratego (Bayer CropScience) has been reduced from 24 hours to 12 hours.

Table 1 presents a partial list of wheat fungicides, the target diseases, application timing, and other pertinent information. Always read and follow label instructions and restrictions before buying and/or applying a fungicide.

Stephen Wegulo
Extension Plant Pathologist

 

Table 1. Fungicides registered for use on wheat to control foliar diseases and Fusarium head blight.1

Product2

Target Diseases

Product Rate/Acre per Application

Application Timing

Notes

Caramba
(BASF)

Black point
Leaf blotch
Powdery mildew
Leaf rust
Stem rust
Stripe rust
Septoria leaf blotch
Septoria glume blotch
Spot blotch
Tan spot
Fusarium head blight
(suppression only)

10-14 fl oz

Apply immediately after flag leaf emergence for optimum control of diseases other than Fusarium head blight; apply at the beginning of flowering for suppression of Fusarium head blight; do not apply within 30 days of harvest

Maximum of 2 applications per season; minimum of 6-8 days between applications; maximum of 34 fl oz of product per acre per season; 12-hour re-entry interval

Dithane® DF
F-45
M-45

(Dow AgroSciences)

Leaf rust
Septoria glume blotch
Septoria leaf spot
Tan spot

2.1 lb
1.6 qts
2.0 lb

Apply no later than Feekes 10.5 (heading complete); do not apply within 26 days of harvest

Maximum of 3 applications per season

Headline®
(BASF)

Black point (kernel smudge)
Leaf rust
Stem rust
Stripe rust
Tan spot
Septoria leaf blotch
Septoria glume blotch
Powdery mildew
Spot blotch

6-9 fl oz

Apply no later than Feekes 10.5 (heading complete)

Maximum of 2 applications per season; maximum of 18 fl oz of product per acre per season; 12-hour re-entry interval

Manzate® 75DF
(Griffin L.L.C.)

Leaf rust
Septoria glume blotch
Septoria leaf spot
Tan spot

2 lb

Apply at disease onset or at the tillering to jointing stage; repeat at 7-10 day intervals; do not apply within 26 days of harvest

Maximum of 3 applications per season; maximum of 6 lb per acre per season

PropiMax® EC
(Dow AgroSciences)

Septoria leaf blotch
Septoria glume blotch
Powdery mildew
Tan spot

2-4 fl oz

Apply at Feekes 3-5 for early season suppression

 

PropiMax® EC
(Dow AgroSciences)

Leaf rust
Stripe rust
Stem rust
Septoria tritici blotch
Septoria glume blotch
Powdery mildew
Tan spot
Spot blotch

4 fl oz

Apply no later than Feekes 10.5 (heading complete)

Maximum of 2 applications per season; minimum of 14 days between applications; maximum of 8 fl oz of product per acre per season; 12-hour re-entry interval

PropiMax® EC
(Dow AgroSciences)

Foot rot

4 fl oz plus half rate of other EPA registered fungicides such as Topsin

Tillering but before elongation

 

PropiMax® EC
(Dow AgroSciences)

Fusarium head blight

4 fl oz

Apply at approximately 50% flowering; Do not apply within 30 days of harvest for forage or hay

 

Prosaro™

Leaf rust
Stem rust
Septoria leaf blotch
Septoria glume blotch
Tan spot
Fusarium head blight

6.5-8.2 fl oz

Apply at the earliest appearance of symptoms on leaves or stems; for Fusarium head blight control, apply from 75% heading to 50% flowering; do not apply within 30days of harvest

Maximum of 2 applications per season; minimum of 7-14 days between applications; maximum of 8.2 fl oz of product per acre per season; 12-hour re-entry interval

Quadris® (Syngenta)

Leaf rust
Stripe rust
Stem rust
Septoria leaf blotch
Septoria glume blotch
Tan spot

4-12 fl oz

Apply no later than Feekes 10.5 (heading complete)

Maximum of 0.40 lb active ingredient per acre per season; 4-hour re-entry interval

Quadris® (Syngenta)

Powdery mildew

7.5-11 fl oz

Apply no later than Feekes 10.5 (heading complete)

 

Quilt® (Syngenta)

Powdery mildew
Septoria leaf blotch
Septoria glume blotch
Tan spot

7-14 fl oz

Apply at Feekes 3-5 for early season suppression

 

Quilt® (Syngenta)

Leaf rust
Stem rust
Stripe rust
Powdery mildew
Septoria leaf blotch
Septoria glume blotch
Tan spot
Spot blotch
Kernel blight

10.5-14 fl oz

 

Apply no later than Feekes 10.5 (heading complete)

Maximum of 2 applications per season; minimum of 14 days between applications; maximum of 28 fl oz of product per acre per season; 12-hour re-entry interval

Quilt® (Syngenta)

Foot rot/Eyespot

14 fl oz plus half rate of other EPA registered fungicides such as Topsin

Tillering but before elongation

 

Stratego® (Bayer)

Leaf rust
Stripe rust
Stem rust
Septoria leaf blotch
Tan spot
Powdery mildew

10 oz

Apply no later than Feekes 10.5 (heading complete)

Maximum of 2 applications per season; minimum of 14 days between applications; maximum of 20 fl oz of product per acre per season; 12-hour re-entry interval

Tilt® (Syngenta)

Powdery mildew
Septoria leaf blotch
Septoria glume blotch
Tan spot

2-4 fl oz

Apply at Feekes 3-5 for early season suppression

 

Tilt® (Syngenta)

Leaf rust
Stripe rust
Stem rust
Powdery mildew
Septoria leaf blotch
Septoria glume blotch
Tan spot
Spot blotch

4 fl oz

Apply no later than Feekes 10.5 (heading complete)

Maximum of 2 applications per season; minimum of 14 days between applications; maximum of 8 fl oz of product per acre per season; 12-hour re-entry interval

Tilt® (Syngenta)

Foot rot

4 fl oz plus half rate of other EPA registered fungicides such as Topsin

Tillering but before elongation

 

Tilt® (Syngenta)

Fusarium head blight suppression

4 fl oz

Apply at approximately 50% flowering; Do not apply within 30 days of harvest for forage or hay

 

Twinline

Black point
Leaf blotch
Powdery mildew
Leaf rust
Stem rust
Stripe rust
Septoria leaf blotch
Septoria glume blotch
Spot blotch
Tan spot

7-9 fl oz

Apply no later than Feekes 10.5 (heading complete)

Maximum of 2 applications per season; minimum of 6-8 days between applications; maximum of 18 fl oz of product per acre per season; 12-hour re-entry interval

1This list is presented for information only and no endorsement is intended for products listed or criticism meant for products not listed. Consult the product label before buying and using a specific fungicide. Read and follow all label directions and restrictions.
2Most of the products listed recommend adding a spreader sticker and must be applied in sufficient water to ensure good coverage.