Technical
phosphite and phosphate.
What we found was interesting and significant, especially for those of us who are regularly applying foliar feeds to our turfgrass.
The research shows that phosphite is rapidly assimilated by turfgrass and translocates throughout the entire plant. The chart above shows phosphite accumulations in turfgrass over six weeks. Importantly, at forty-eight hours post application, amounts were almost 5000ppm, proving rapid assimilation. Amounts declined to 2561ppm after two weeks, indicating a three to four week application cycle would maintain levels consistently around 4000ppm. The analysis also determined that phosphate amounts, in both treated and control plants, were not significantly different, confirming that phosphite is not metabolised in the plant to phosphate.
A longer term study is showing that metabolic rate affects the amount of time phosphite persists in the leaf tissues, with a trend for increases in accumulations in meristematic tissues.
Our analyses of phosphite treated turfgrass tissues determined rapid in planta accumulations, symplastic mobility and no in planta conversion to phosphate.
Further research
All the research outlined above is still ongoing, with the field trials and
laboratory work are continuing to provide valuable data.
Our current research is also looking at the possibility that phosphite can reduce M. nivale infection through enhancement of the turfgrasses natural defence processes.
Does Phosphite enhance the defence responses in infected turfgrass?
Obviously, we first need to understand the Microdochium infection process and turfgrass responses before we can determine if these responses are stimulated by phosphite treatment. We are presently studying this using pot samples and infected greens, and employing a range of microscopy procedures.
It will be a further two to three years before the study can be fully published and then, hopefully, will give a valuable insight into the question “So what is phosphite and what exactly can it do for turfgrasses?”
In summary, what can be concluded from the results of this research to date is that routine and sequential applications of phosphite, as part of an integrated disease management programme, whilst not reducing M. nivale to an acceptable
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level, will significantly reduce the incidence and severity of the disease. Furthermore, the addition of phosphite to a fungicide can significantly enhance suppression of M. nivale.
Phosphite treatment also gives rise to significantly improved visual quality and greater density than the untreated controls.
This article was originally published in Greenside magazine, the official publication of the GCSAI.
Microdochium active on Poa annua
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