[rimprona] Recent observations on RIMpro

[Randal Pratt]

Now we have a complete divergence between NEWA and Rimpro.  NEWA  is
showing a scab infection for the next three days and nothing for May 1st
and 2nd, while Rimpro has a very minimal infection for the next three days
and a tremendous infection for May 1st and 2nd.

Hard to reconcile these differences.

Randy Pratt
Wilkens Fruit Farm

On Wed, Apr 27, 2016 at 11:59 AM, David A. Rosenberger <dar22 at cornell.edu>
wrote:

> Following are a few observations on RIMpro graphs as I am currently seeing
> them for Highland, NY:
>
>   1. Based on RIMpro using our NEWA station data, we are now at or nearing
> full bloom, and we still have not had any infection events with RIM values
> above 38.
>
>   2. My perception (from my own observations over the past two years, plus
> what I hear from the Europeans) is that infection periods with RIM values
> below 300 are not economically important in CLEAN orchards at the BEGINNING
> and END of the ascospore release period.  More caution is warranted when
> there are infection periods during the peak ascospore release times between
> tight cluster and petal fall.  Thus, I hope that no one is continuing to
> leave trees totally unsprayed into full bloom just because RIMpro has shown
> no infection periods with RIM values over 300.  (Besides, in many areas,
> you need sprays by pink bud stage to control mildew even if scab is not a
> problem.)
>
>    4. Just a reminder about the graph at the bottom of the RIMpro output:
>  The bright red part of the graph shows mature spores, and that level will
> fluctuate as spores mature on days with no rain and then are released on
> days with rain.  The dark red or burgundy layer below that shows spores
> remaining in the leaf litter.  This declines in a more steady line, but the
> primary scab season will not be over until all of the deep red color at the
> base of the graph has disappeared.
>
>    5. I have been comparing outputs from the MeteoBlue and NEWA data for
> our Highland location.  Because they are using different weather forecast
> sources, the forecasts are often quite different, which is not unexpected
> since any and all weather forecasts have a high degree of inaccuracy.  I am
> more concerned that the MeteoBlue system is indicating extended wetting
> periods have occurred where that has not been the case based on NEWA data
> and (to some degree) my own observations. Thus, the MeteoBlue virtualy data
> is, in my opinion, still unable to accurately ascertain when leaves are wet
> or dry and will need more fine-tuning before it produces a reliable record
> of infection events.
>
> ********************************************
> Dave Rosenberger, Plant Pathologist (retired)
> Hudson Valley Lab, P.O. Box 727, Highland, NY 12528
>     Cell:     845-594-3060
> ********************************************
>
>
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> RIMproNA at virtualorchard.com
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>
>


-- 
*Randal Pratt*
1335 White Hill Road
Yorktown Heights, NY 10598
914-245-4098
914-245-5111
Fax 914-245-4099
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