Anthracnosis is a fungal disease caused by the fungus Colletotrichum Cereale, which survives on remains of soil organic matter. The most important damages take place on Poa Annua greens and sometimes on Agrostis greens.Read More
Detecting diseases in turfgrass is an arduous and difficult task. The common name of Helminthosporium comes from the old scientific name (Helminthosporium spp). Leaf, collar and root diseases, known as Helminthosporium are nowdays, after some changes in the taxomomy, accepted to be caused by species of fungi from genera Drechslera spp, Curvularia spp, Bipolaris spp y Exserohilum spp.
|Melting out||Drecheslera poae||Kentucky bluegrass, bufalograss|
|Helminthosporium||Bipolaris sorokiniana||Kentuky bluegrass, agrostis, Poa annua, Fescues, ryegrass, bermuda grass|
|Read leaf spot||Drechslera erythrospila||Agrostis|
|Helminthosporium blight||Drechslera dictyoides||Festucas, ryegrass, Poa pratensis|
|Zonate eyespot||Drecheslera||Bermuda grass, agrostis y Poa annua|
Source: L.B.McCarty, Golf Course Management Best Practices.
Symptomatology includes brown to purple foliar spots, black with gray centers on leaves, etc. depending on the host. In the most extreme cases the entire lawn may fade completely. Drechslera occurs predominantly on winter turf in spring and autumn.
These fungi are very active continuously, except when the soil is frozen or excessively warm. The roots, rhizomes and lower leaves are infected by the mycelium that grows from the remains of mowing and thatch, being necessary that thin layer of dew or moisture (for more than 10 hours and consecutive days), so it is necessary that microenvironment of moisture and optimum temperatures between 15 and 18 º C (although they can occur with wider intervals of Tº, between 3 and 27 º C), low light intensity (new stages of soccer much more closed) and excessive nitrogen fertilization.
These fungi produce a brown mycelium that grows inside and along the grass leaf, producing parasitic fungi and conidia that are spread to healthy leaves by wind, rain, irrigation water, mowers, etc…
Know exactly if you are suffering from Helminthosporium you have through its correct identification with qPCR analysis. Contact us at firstname.lastname@example.org and we will collect the necessary samples for you. Make a preventive management in order not to reach limit situations.
Members of the genus Pythium belong to a group of organisms known as “oomycetes”, a group of filamentous protists belonging to the pseudofungi group, which survive year after year as oospores on our greens or soccer fields, and are also very mobile through the movement of irrigation water, our mowers or the players themselves.Read More