Frogeye leaf spot resistant to strobilurins?
A crop consultant working in southeast Missouri recently examined a soybean field that had many plants infected with frogeye leaf spot, and the field had previously been treated with a strobilurin fungicide. The fungicide should have stopped development of frogeye, but had not.
The consultant sent frogeye leaf spot-affected soybean leaves from this field to be tested for strobilurin fungicide resistance by Dr. Carl Bradley at the University of Illinois. Dr. Bradley isolated the pathogen from 10 different leaves and tested each for sensitivity to strobilurin fungicide.
He learned that the isolates collected from four leaves were sensitive to strobilurin fungicides, but the isolates from six leaves were resistant to strobilurin fungicides. This is the first confirmed finding in Missouri of this pathogen that is strobilurin resistant.
Farmers and consultants should observe soybean fields that have been treated with a strobilurin fungicide to determine if frogeye leaf spot is present and still spreading. If so, plants in the field could be treated with a fungicide other than strobilurin to stop the spread of this disease.
Current research results show that application of a fungicide to soybean plants at or past the R6 growth stage, when seeds are full sized, will not be as beneficial to yield as an application made at the R3 or R5 growth stages.
Self-contained hydraulic system with power cables (hydraulic). Tandem Henschen axles (hydraulic). Hydraulic fenders. Manual or hydraulic tilt. 6,500-gallon tank.
- Dry weather, biofuel mandate to boost palm prices in 2014
- 2014 Farm Bill: Reallocating base acreage
- FAS administrator talks world ag export situation
- The Beige Book is out. The agriculture picture is not rosy
- New precision potassium fertilizer from AgroLiquid
- Ag markets ended the week in decidedly mixed fashion
- Are you in favor of a federal labeling standard for food that might contain genetically modified ingredients?
- Commentary: Barking up the wrong tree
- Water allocation for most drought-stricken Calif. farms to end
- Larson Electronics offers 150 Watt LED high bay light fixture
- Growth Points: Big data is about to get even bigger
- Update on the world’s 15 largest seed banks
Fertilizer Conveying Systems
Waconia Manufacturing Inc.