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Knowledge and Patience Required to get the University Oval Wicket Right
2 Days ago by: university.oval@xtra.co.nz
"did you like that micro manage wording.....thought it sounde ..."
Knowledge and Patience Required to get the University Oval Wicket Right
4 Days ago by: Rob Jenkins
"You will just have to micro manage what shirts your photogra ..."
Knowledge and Patience Required to get the University Oval Wicket Right
4 Days ago by: university.oval@xtra.co.nz
"Might have to get a new picture......DB tshirt not a good lo ..."
Reviewing the Performance of Golf Course Bunkers
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"bunkers are meant to be a hazard and should not need daily r ..."
Campey Down Under
2 Weeks ago by: Geoff Hatton
"This great fraternity produces the best experiences with gre ..."
By Greencast in Consultancy on 26th Jan 2010 8:00
Large P
atch is an early - mid spring disease of warm season turfgrasses. First reported on zoysiagrass, the disease was initially named Zoysia patch. After the pathogen was identified on numerous warm season turfgrasses, the common name "Large Patch" evolved. Although most severe on zoysiagrass, large patch is increasingly becoming more prevalent on seashore paspalum.
The pathogen Rhizoctonia solani is similar to the pathogen that causes brown patch on cool season turfgrasses, except the large patch pathogen belongs to a different anastomosis group (AG-2-2 (LP). The optimal temperature for infection is 25-28C but can infect at temperatures ranging from 10 to 30 C. Generally, large patch is most severe under moist or wet conditions.
Cultural practices that minimize surface moisture will help reduce the severity of large patch. Prolonged periods of fog or dew enhance the severity of this disease. Although, eliminating fog is beyond our management abilities, reducing dew periods through dragging, poling or lightly syringing will decrease disease severity. During winter and early spring maintain moderate to low nitrogen levels during periods when Rhizoctonia is active.
Fungicides are available that will control Large patch. In general preventative treatments are more effective than therapeutic (curative) treatments.
(Above left) Large patch symptoms on zoysiagrass. The symptoms often appear as the turf is breaking winter dormancy. (Centre) Large patch symptoms on most warm season turfgrasses appear as a whitish color and rather large areas are affected. (Above right) Large patch is becoming more of a common disease of seashore paspalum. The picture below was taken on a ‘SeaDwarf’ seashore paspalum fairway.
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Read more articles in Consultancy, by Greencast or from January 2010.
