Golf Course Management

JUL 2017

Golf Course Management magazine is dedicated to advancing the golf course superintendent profession and helping GCSAA members achieve career success.

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Page 73 of 137

70 GOLF COURSE MANAGEMENT 07.17 populations. We hypothesize that the long persistence of fluopyram continuously pro - tects new growth of Poa annua against shoot infections and, consequently, gall formation. This breaks the life cycle and eventually leads to Anguina population reduction in the soil. Nimitz Pro G Quali-Pro's Nimitz Pro G is a granular formulation of fluensulfone, a new chemistry in its own chemical class. Fluensulfone has both contact and systemic activity, so it can kill nematodes in soil and perhaps within turf roots. It has a low adsorption value; in Flor - ida, it moves readily through thatch and into the soil below. The half-life is relatively short, so multiple applications of lower rates tend to work better than one or two applications of higher rates. For golf courses, either four appli - cations of 60 pounds/acre (67.25 kilograms/ hectare) or three applications of 80 pounds/ acre (89.66 kilograms/hectare) at monthly in - tervals have yielded the best results. In con- trast, in cool, coastal California, Nimitz Pro G had no effect on Pacific shoot-gall disease. Soil populations of A. pacificae as well as those of ring or spiral nematodes were unchanged compared with the non-treated control. In Florida, fluensulfone has shown activity against sting, lance and root-knot nematodes in lab and field trials. Because it has systemic activity, it can be effective on lance and root- knot nematodes inside of roots in addition to nematodes present in the soil. As with other nematicides, better turf responses from Nim - itz Pro G have been observed when used in conjunction with a good fungicide program. Because fluensulfone is very mobile in soil, Nimitz Pro G should not be used if heavy rain is expected in the near future, and excessive irrigation should not be applied after treat - ment to prevent moving the fluensulfone past the nematodes. Conclusions These new nematicides, along with the ones already in the arsenal, provide golf course superintendents with multiple tactics for man - aging nematodes. However, each new nema- ticide works better on some nematodes than on others. Unlike Nemacur, which worked well against all the turf nematodes, the new products require turf managers to know what kind of nematode is the primary target so that A putting green suffering from an infestation of Anguina pacificae, which is found in coastal areas of Northern California. Corners of three plots are marked by golf balls: left plot, untreated; center plot, treated with Divanem; right plot, treated with Indemnify. Photo by James Baird

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