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Belchertown MA, - Orchard Radar


Apple Pest Monitoring Pocket Guide

Apple Calendar - Early season          Apple Calendar - Late season

Jump down to sections: 
Scab     Fire blight     Flyspeck     Insects & Mites     Horticulture     Weather 

    Some of the longer tables may require hitting "refresh" (F5 key for Internet Explorer) to completely download.


* CURRENT WEATHER *    Weather archive is at bottom of this page.
Hourly weather chart       32 day temp. chart      32 day rain chart
Hourly forecast table    
        Hourly observations - 7 days back



* APPLE SCAB *                       "" Back to top  
Apple scab - Key dates 

Daily scab infection conditions rating chart   Ratings on this chart account for ascospore maturity, previous ascospore releases, leaf wetness duration, amount and timing of rain, average temperature, leaf size, and foliar susceptibility.  It is a comprehensive, but relative, estimate of primary scab infection conditions.  It does not estimate the actual absolute risk because it does not account for inoculum level, which is the single most important component of scab risk.
Daily scab conditions in Table format   

Primary scab infection potential development and release
    This chart shows the season's cumulative scab infection risk based on criteria listed above.

Scab ascospore maturity Chart  
       Scab ascospore maturity in Table format
          Ascospore maturity by itself is less useful than comprehensive estimate shown in the Dailyabove.

Primary scab infection periods: DETAILS   
This table estimates the timing and severity for each rain event during primary scab season.  
      Primary & secondary scab infection periods: Summary
     This table has less detail, but it covers wetting periods throughout the growing season. 
It also forecasts scab conditions one day further ahead than the detailed report. 

   Primary scab

* For orchards protected by a "Surface fungicide"
           The "Surface fungicide" group is also called "Contact" or "Protectant" fungicides.  It includes: Captan, Dithane, Manex, Manzate, Penncozeb, Polyram, and Syllit.
        For sterol inhibitor fungicides (Nova, Procure, Rubigan) applied with a full-dose Surface fungicide, use the Surface fungicide table to estimate the respray date. 
        An estimated respray date is not available for sterol inhibitor fungicides used alone or with a reduced rate of a Surface fungicide.

   * For orchards protected by a Strobilurin fungicide
           The strobilurin fungicides are Flint and Sovran.

        * For orchards protected by a Sulfur fungicide   
No postinfection estimates are included in the sulfur table because it is designed for organic spray programs that do not include synthetic postinfection fungicides.

         These next two tables are only for use in
Low-scab blocks where scab ascospore release is not considered significant unless there is daytime rain.  Use these low-scab tables ONLY if you know the orchard's scab index from the previous fall.  See the New England Apple Pest Management Guide for details.
*   For Surface fungicides used in low-scab blocks
*   For Strobilurin fungicides used in low-scab blocks

   Secondary scab
        1st and 2nd generation scab lesion appearance dates

      Secondary Scab fungicide depletion
      This table has respray guidelines for the transition period between the end of primary scab ascospore releases and confirmation of successful scab control. 

* FIRE BLIGHT *              "" Back to top
    Comparing the CougarBlight and MaryBlyt models helps interpret borderline situations.
CougarBlight - daily risk of fire blight blossom infection

     CougarBlight model - chart version

MaryBlyt - daily risk of fire blight blossom infection 


* FLYSPECK *                 "" Back to top
See background information for flyspeck tables for definition of "low-risk" trees

Flyspeck control with Pristine - 21 day or 2.5" rain protection
   Flyspeck - Pristine - 1stCover through June spray dates
       Flyspeck - Pristine - July spray dates
Flyspeck - Pristine - August-Sept. spray dates

Flyspeck control with Group A fungicides (Topsin M, Flint, Sovran, phosphite + captan)
                                                                        - 21 day or 2.0" rain protection

   Flyspeck - Group A - 1stCover through June spray dates
       Flyspeck - Group A - July spray dates
Flyspeck - Group A - August-Sept. spray dates
Flyspeck control with Group B fungicides (full-dose captan or ziram)
                                                                               - 14 day or 1.5" rain protection
    Flyspeck - Group B - 1stCover through June spray dates
       Flyspeck - Group B - July spray dates         
Flyspeck - Group B - August-Sept. spray dates


* INSECTS *           "" Back to top

Key life cycle and management dates based on cumulative degree days.

The rules used to estimate residue depletion for insecticide protection against plum curculio, codling moth, and apple maggot follow commonly stated guidelines for organophosphate insecticides.  Depletion rules for newer materials (such as Actara, Assail, Avaunt or Calypso) or pyrethroids may be different.

Plum Curculio - insecticide depletion Table

      Plum Curculio - insecticide depletion Chart
             Experimental only:  Plum Curculio activity rating

             Ratings do not account for minimum fruit size threshold


Codling moth insecticide depletion table:  June
    Codling moth insecticide depletion table:  July
                Codling moth insecticide depletion table:  August

Apple maggot July monitoring & respray dates
               Apple maggot August monitoring & respray dates


* MITES * 
European Red Mite (ERM) key dates  

ERM resample dates - June 
        ERM resample dates - July&August
See Mite thresholds for explanation of what "Below" and "Far below" threshold means.




* HORTICULTURE *          "" Back to top

McIntosh Bud Stage Predictor 

Bud stage definitions from Michigan State University

Thinning weather synopsis chart 

    Thinning weather table has the same ratings in text format.

    Thinning weather estimates are based on the influence of night time temperatures and daytime cloud cover on sensitivity of young apples to postbloom thinning agents.

Rough estimate of McIntosh harvest dates  This page only is active after Full bloom, and the final estimate requires 30 days of temperature data after Full bloom.

Preharvest weather influences on Storability, Drop, Color, and Scald risk 
   This table presents indicators for potential effects of temperature and drought on long-term storability of apples, high temperatures on acclerated drop of mature McIntosh, optimum temperature and sunlight conditions for developing fruit color, and decrease in scald susceptibility with increasing accumulation of degree hours below 50F.


* WEATHER archive *          "" Back to top

Weather Data - April      Weather Data - July

Weather Data - May       Weather Data - August

Weather Data - June     Weather Data - September


Degree day accumulation
Cumulative degree days - April   Cumulative degree days - July    
Cumulative degree days - May    Cumulative degree days - August 
Cumulative degree days - June   Cumulative degree days - September



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This site is supported by funding from the Northeastern IPM Center.

Last updated:  April 22, 2013 06:19 PM

Web master:  Glen Koehler, University of Maine Cooperative Extension