How to treat Take All Patch Disease
Advice on the best way to treat take all varies according to individual conditions and the likelihood of a severe outbreak occurring.
In most cases a strobulurin fungicide should be applied at the initial stages of a take all outbreak. Sometimes more than 1 application is necessary. After this further fungicide applications do not usually give any more control and it is best to manage the turf to favour the natural disappearance of the disease due to take all decline.
Proper nitrogen fertility is important in managing take-all patch. Urea-based fertilizers tend to be effective in managing the disease when applied at adequate levels to creeping bent grass turf stands. Liming should be avoided in areas where take-all is a problem as an alkaline pH favours the disease. Soil pH should be below 6.5, preferably between 5.5 and 6.0.
Manganese deficiency has shown to greatly enhance take-all patch development, therefore adequate manganese fertility should be practiced depending on soil and tissue analyses. Excessive irrigation should be avoided as well and wetting agents can be used to stop grass with damaged root systems drying out.
The interesting phenomenon called “take-all decline,” associated with wheat monoculture, has been described in many parts of the world. When this happens, the disease declines to an insignificant level after several years of being severe.
Root-colonizing bacteria, that are antagonistic to the take-all fungus, build up in the soil to make it suppressive to take-all. An important aspect of suppression is the production of antibiotics by the bacteria that inhibit the growth of the fungus on the root. Take-all decline is one of the classic examples of “biological control” of a plant disease and has been extensively studied.
Further Advice and Assistance
I have attached 2 articles written by American Universities which describe take all as it occurs under cool season (i.e. UK and N Europe conditions) and on warm season grasses (i.e. Mediterranean conditions) and both offer sensible advice on the identification and management of take all disease.
Hitas Products Ltd have laboratories and expert technical staff who can diagnose disease and recommend the most effective treatment. If you need assistance, please contact us by phone or email and send in a turf sample for examination if this is possible. We will be pleased to assist in any way we can.