Weather and Turf Disease –Early Spring 2013 – Turfgrass Science at Purdue University

Weather and Turf Disease –Early Spring 2013

Nobody needs to be reminded that March 2013 has been colder than the last several years.  The good thing is that wintry conditions prevent wasted fungicide applications.  Keep watching the summer patch soil temperature monitor.  Remember that there are several elements to the decision rule.  The cardinal temperature seems to be around 65F—in soil at 2” depth.  Also understand that the pathogen does not emerge from dormancy like an “on/off” light switch.  It is more like a dimmer switch, which reinforces the notion of waiting until the natural warming period prevails, rather than hastily making an application in response to an unnatural spike in soil temperature.
 
I doubt that anyone has had the opportunity to apply early season sprays for dollar spot control.  Results from our research over the past 3 seasons indicate that fungicide sprays would surely be wasted if applied over the past 4 weeks.

Combination Fungicide Products – 2013

There is a trend among basic manufacturers to combine active ingredients to improve efficacy and broaden the spectrum of activity of treatments for turf disease control.   Below is a list of fungicide combinations that may serve as a resource for identifying the active ingredients in new fungicide products.
 
Product Name
#
Active ingredients
Equivalent products
Headway
2
azoxystobin + propiconazole
Heritage + Banner 
Briskway
2
azoxystrobin + difenconazole
Heritage + difenconazole
Concert
2
propriconazole + chlorothalonil
Banner + Daconil
Instrata
3
propiconazole + ctl + fludioxanil
Banner + Dac + Medallion
Renown
2
azoxystrobin + chlorothalonil
Heritage + Daconil
 
 
 
 
Tartan
2
trifloxystrobin + triadimefon
Compass + Bayleton
Reserve
2
triticonazole + chlorothalonil
Triton + Daconil
Interface
2
trifloxystrobin + iprodione
Compass + 26GT
 
 
 
 
Honor
2
pyraclostrobin + boscalid
Insignia + Emerald
Encartis
2
boscaild +  chlorothalonil
Emerald + Daconil
Pillar G
2
triticonazole + pyraclostrobin
Trinity + Insignia
 
 
 
 
26/36
2
Iprodione + thiophanate-methyl
26GT + Cleary 3336
Twosome
2
iprodione + thiophanate-methyl
26GT + Cleary 3336
 
 
 
 
Stellar
2
fluopicolide + propamocarb
Fluopicolide + Banol
 
 
 
 
Disarm M
2
fluoxastrobin + myclobutanil
Disarm + Eagle
Disarm C
2
fluoxastrobin + chlorothalonil
Disarm + Daconil
 
 
 
 
Dac-Action
2
chlorothalonil + acibenzolar
Daconil + acibenzolar
 
 
 
 
Junction
2
mancozeb +  copper hydroxide
Fore + copper hydroxide
 
 
 
 
 
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Disclaimer: Reference to products is not intended to be an endorsement to the exclusion of others which may have similar uses. Any person using products listed in these articles assumes full responsibility for their use in accordance with current directions of the manufacturer.
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