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Mike Coker and son Troy work on golf courses ... - Backed By Bayer

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SOLUTIONS<br />

PEST MANAGEMENT<br />

Pests We Love<br />

toHate<br />

Dollar spot: The Rodney Dangerfield of turfgrass diseases<br />

<strong>By</strong> J.M. Vargas Jr.<br />

Dollar spot, caused by Rutstroemia<br />

floccosum (formerly Sclerotinia<br />

homoeocarpa), is <strong>on</strong>e of the most<br />

widespread of all the turfgrass<br />

diseases. It was known for many years that the<br />

dollar spot fungus was not in the genus Sclerotinia.<br />

But its identity remained a mystery<br />

because we traditi<strong>on</strong>ally identified fungi<br />

based <strong>on</strong> the spores they produced.<br />

Because the dollar spot fungus does not<br />

produce any spores, positive identificati<strong>on</strong><br />

could not be made until the advent of DNA<br />

technology. <strong>By</strong> using its genetic informati<strong>on</strong>,<br />

the dollar spot fungus was determined<br />

to be in the genus Rutstroemia. The floccosum<br />

species name is derived from the fact<br />

that it produces fluffy mycelium.<br />

Although we refer to the pathogen that<br />

causes the disease as R. floccosum, it is made<br />

up of subgroups — similar to how creeping<br />

bentgrass is <strong>on</strong>e grass species, but has many<br />

different cultivars. The dollar spot fungus’<br />

subgroups are called vegetative compatibly<br />

groups (VCGs). Some of these VCGs occur<br />

in cool weather <str<strong>on</strong>g>and</str<strong>on</strong>g> others in warmer<br />

weather. We even have a new <strong>on</strong>e in the<br />

www.bayer<strong>golf</strong>advantage.com Golf Advantage 35

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