ISSUE #564

564 - Disease Management 2012

3-13-12

Rhizoctonia

Rhizoctonia root and crown rot has surpassed Aphanomyces as the most widespread disease in the American Crystal growing area. Incidence and severity have dramatically increased in the past decade. Several options are available to minimize disease impact. Every option for management and control should be utilized. Yield losses can reach 50 percent if not controlled.

564.1

Rhizoctonia Management Options Based on Disease Severity
Disease SeverityRecommended Management
Slight Post Fungicide Only
Moderate Lengthen crop rotation. Use tolerant variety. In-furrow or T-band fungicide. One POST fungicide application.
Severe Lengthen crop rotation. Use tolerant variety. In-furrow or T-band fungicide. POST fungicide once or twice as needed.

564.2

(Click chart to enlarge)


Plant Population Choices

American Crystal variable rate seeding research has shown that seeding rates should be increased by at least 10 percent on the lower productivity areas of fields if you have variable rate seeding planter equipment.