[rimprona] Recent observations on RIMpro

[Jon Clements]

I believe Randy would be looking at this:

http://newa.cornell.edu/index.php?page=weather-station-page&WeatherStation=khpn

On Thu, Apr 28, 2016 at 8:03 AM, Marc Trapman <marc at rimpro.eu> wrote:

> 1/ Can you please provide me link for the NEWA scab prediction so I can
> see what is going on at try to explain differences ?
> 2/ MeteoBlue again proves very accurate in Europe. I can imagine that the
> quality for US is different.
>
> Thanks,
> Marc
>
> Op 28 apr. 2016  (week17), om 13:53 heeft Randal Pratt <
> rpratt713 at gmail.com> het volgende geschreven:
>
> 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
>> http://virtualorchard.com/mailman/listinfo/rimprona
>>
>>
>
>
> --
> *Randal Pratt*
> 1335 White Hill Road
> Yorktown Heights, NY 10598
> 914-245-4098
> 914-245-5111
> Fax 914-245-4099
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>
>
> Marc Trapman
> Bio Fruit Advies / RIMpro
> marc at rimpro.eu
>
>
>
>
>
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>


-- 
Jon Clements
aka 'Mr Honeycrisp'
UMass Cold Spring Orchard
393 Sabin St.
Belchertown, MA  01007
413-478-7219
umassfruit.com
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