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™ |
Black point |
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 |
Leaf rust |
2.1 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® |
Black point (kernel smudge) |
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 |
Leaf rust |
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 |
Septoria leaf blotch |
2-4 fl oz |
Apply at Feekes 3-5 for early season suppression |
|
|
PropiMax® EC |
Leaf rust |
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 |
Foot rot |
4 fl oz plus half rate of other EPA registered fungicides such as Topsin |
Tillering but before elongation |
|
|
PropiMax® EC |
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 |
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 |
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 |
7-14 fl oz |
Apply at Feekes 3-5 for early season suppression |
|
|
Quilt® (Syngenta) |
Leaf rust |
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 |
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 |
2-4 fl oz |
Apply at Feekes 3-5 for early season suppression |
|
|
Tilt® (Syngenta) |
Leaf rust |
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 |
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. |
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