• Notes From The Field

Spring Preventative Dollar Spot Advice

Wednesday, April 7, 2010

by Jerry Husemann

Emerald® fungicide - A Better Standard For Dollar Spot Control

Emerald fungicide works differently than anything else you've seen used to control dollar spot (it is a different class of fungicide chemistry for dollar spot). In much of the Midwest, golf course superintendents are experiencing resistance concerns to dollar spot with the Sterol-inhibiting class of fungicides. Dollar spot resistance with this class of chemistry is defined by a decreased length of control and reduction in efficacy, not like some fungicide chemistries where resistance can mean zero control. When the Sterol-inhibiting fungicide class of chemistry was first used for dollar spot control, it was fairly common to achieve 28 days length of dollar spot control. Due to many years of over-use, many golf courses are now barely getting 14 days dollar spot control.

The value of inserting Spring & Fall Applications of Emerald into the management of dollar spot is very significant. Emerald fungicide is a true resistance management tool for controlling dollar spot and is consistently a leading performer in University Dollar Spot Trials and with golf course locations.

 

 

 

BASF Early Preventative 2010 Spring Dollar Spot Recommendations for Ohio & Michigan

These recommendations include using Curalan® fungicide, which is sold as Touché™ fungicide by John Deere Landscapes.

1) Apply Curalan/Touché fungicide in Early April with the exception of Northern Michigan. In Northern Michigan, the timing of the Curalan/Touché application is in Early May. Curalan/Touché is a nice foundational application for Emerald in the Spring. Curalan/Touché controls Dollar Spot, Fusarium Patch, Leaf Spot, Melting Out, Pink Snow Mold, Red Thread, & others. The behavior in the turfgrass plant is defined as Contact and Local Systemic Activity.



2) Apply Emerald fungicide @ .18 oz/m or .49 Lb/Acre(1 pak) 3 weeks after the Curalan/Touché application as an Early Spring Preventative application before the dollar spot becomes active. Emerald's behavior in the turfgrass plant is defined as Upward Systemic and Limited Translaminar movement. Emerald controls dollar spot & bentgrass deadspot disease and has also shown some levels of suppression of brown patch in University Research Trials.

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