Other common names:
Helmo, formerly Helminthosporium spp. are a common and serious group of diseases, including Drechslera spp., Curvulari spp., Bipolaris spp. and Exserohilum spp., that can severely reduce the aesthetic appeal of the turfgrass or in severe cases can lead to the need for turf replacement to occur. The disease is able to develop at temperatures between 3°C and 30°C, with favourable temps being between 15°C and 18°C. The disease cycle is generally short requiring extended periods of leaf wetness to develop and survive.
Warm-and cool-season turfgrasses across Australia.
The symptoms of helmo turf diseases vary, depending upon the specific pathogen, grass species, weather conditions, and cultural conditions involved. In general, white helmo produces small bleached (white) spots or patches of dead of dying grass which do not measure more than about 10 cm in diameter (Wong, 2010). Black helmo is the same as the latter with the exception of producing black spots or patches and “melting out”. Leaf tissues turn yellow around these lesions and in severe cases the infected plant dies.
Wong, P. (2010) New patch diseases of couch in Australia, 26th Annual Australian Turfgrass Conference Proceedings, Gold Coast, pp. 58-61.
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