Protectant fungicide Respray Dates for Secondary Scab Suppression

Background Information for this page
Return to radar list for Monmouth ME
     This table estimates fungicide intervals for suppressing spread of secondary scab.  Use the appropriate primary scab respray guidelines instead of this table until ascospore releases are completed.  Rules used to estimate protection depletion are described on the Background Information page (see link above). 
    
Green text and yellow background indicates dates after final primary scab control sprays until the date scab control can be confirmed by scouting for presence of 2nd generation scab lesions.    
    Brown text with grey background indicates dates when 2nd generation scab lesions from the final ascospore release have had time to begin appearing.  By this point, growers will have had opportunity to confirm the status of primary scab control.  Estimates for these dates are provided only for those situations where scab control has not been successful, and there are enough active scab infections present to cause an unacceptable risk of fruit scab infection.  In that case, fungicide protection is needed for at least 4 weeks until active scab lesions exhaust their supply of spores. 
    Depending on scab severity, market sensitivity, temperatures, rain frequency, and proximity to harvest; shorter or longer fungicide intervals to suppress spread from active scab lesions may be more appropriate than the estimates shown below. 
      The estimated date for 95+% scab ascsopore release at this site is: May 31.    The estimated McIntosh fruit set date for this site is June 2.  The approximate terminal bud set date for this site is July 14.
Weather data for Monmouth ME.  Forecast values begin October 17, 2008
Inches Rain Previous
Spray Date
- protection end date
estimate assumes that fungicide was applied
before any rain on spray date.
Secondary Scab
Protection End Date
for full dose
captan, mancozeb or other protectant fungicide applied on spray date 
Percent of primary scab potential beginning to show
as (1st generation)
&
2nd generation
lesions by end of protection
Respray Deadline
= Start date for next scab infection period after protection ends
0.05 Tue,  May  27   June 6, Fri (69%)   4% June 6,  Fri
0 Wed,  May  28   June 7, Sat (69%)   4% June 10,  Tue
0 Thu,  May  29   June 7, Sat (69%)   4% June 10,  Tue
0 Fri,  May  30   June 8, Sun (69%)   4% June 10,  Tue
0.82 Sat,  May  31   June 9, Mon (69%)   4% June 10,  Tue
0 Sun,  June  1   June 10, Tue (69%)   4% June 10,  Tue
0.02 Mon,  June  2   June 14, Sat (93%)   4% June 15,  Sun
0.20 Tue,  June  3   June 16, Mon (99%)   69% June 18,  Wed
0.30 Wed,  June  4   June 16, Mon (99%)   69% June 18,  Wed
0.05 Thu,  June  5   June 16, Mon (99%)   69% June 18,  Wed
0.19 Fri,  June  6   June 17, Tue (100%)   69% June 18,  Wed
0 Sat,  June  7   June 17, Tue 69% June 18,  Wed
0 Sun,  June  8   June 17, Tue 69% June 18,  Wed
0 Mon,  June  9   June 17, Tue   69% June 18,  Wed
0.65 Tue,  June  10   June 22, Sun 69% June 22,  Sun
0.28 Wed,  June  11   June 22, Sun 69% June 22,  Sun
0 Thu,  June  12   June 22, Sun 69% June 22,  Sun
0 Fri,  June  13   June 22, Sun 69% June 22,  Sun
0 Sat,  June  14   June 22, Sun 69% June 22,  Sun
0.51 Sun,  June  15   June 24, Tue 69% June 24,  Tue
0.40 Mon,  June  16   June 27, Fri   100% July 3,  Thu
0.24 Tue,  June  17   June 27, Fri July 3,  Thu
0.22 Wed,  June  18   June 29, Sun July 3,  Thu
0.01 Thu,  June  19   June 29, Sun July 3,  Thu
0.24 Fri,  June  20   June 29, Sun July 3,  Thu
0 Sat,  June  21   June 29, Sun July 3,  Thu
0.70 Sun,  June  22   June 29, Sun July 3,  Thu
0.12 Mon,  June  23   June 29, Sun     July 3,  Thu
0.15 Tue,  June  24   June 30, Mon July 3,  Thu
0 Wed,  June  25   June 30, Mon July 3,  Thu
0.02 Thu,  June  26   June 30, Mon July 3,  Thu
0.57 Fri,  June  27   July 11, Fri July 14,  Mon
0.18 Sat,  June  28   July 12, Sat July 14,  Mon
1.19 Sun,  June  29   July 12, Sat July 14,  Mon
0.12 Mon,  June  30   July 14, Mon     July 18,  Fri
0 Tue,  July  1   July 15, Tue July 18,  Fri
0 Wed,  July  2   July 16, Wed July 18,  Fri
0.14 Thu,  July  3   July 17, Thu July 18,  Fri
0 Fri,  July  4   July 18, Fri July 18,  Fri
0 Sat,  July  5   July 19, Sat July 19,  Sat
0 Sun,  July  6   July 20, Sun July 23,  Wed
0 Mon,  July  7   July 20, Sun     July 23,  Wed
0 Tue,  July  8   July 20, Sun July 23,  Wed
0.19 Wed,  July  9   July 20, Sun July 23,  Wed
0 Thu,  July  10   July 20, Sun July 23,  Wed
0 Fri,  July  11   July 20, Sun July 23,  Wed
0 Sat,  July  12   July 20, Sun July 23,  Wed
0 Sun,  July  13   July 20, Sun July 23,  Wed
0.07 Mon,  July  14   July 20, Sun     July 23,  Wed
0 Tue,  July  15   July 20, Sun July 23,  Wed
0 Wed,  July  16   July 20, Sun July 23,  Wed
0 Thu,  July  17   July 20, Sun July 23,  Wed
0.73 Fri,  July  18   July 21, Mon July 23,  Wed
0.20 Sat,  July  19   July 21, Mon July 23,  Wed
1.36 Sun,  July  20   July 24, Thu July 27,  Sun
0.65 Mon,  July  21   July 24, Thu     July 27,  Sun
0.01 Tue,  July  22   July 24, Thu July 27,  Sun
0.28 Wed,  July  23   July 27, Sun July 27,  Sun
1.78 Thu,  July  24   August 1, Fri August 5,  Tue
0.17 Fri,  July  25   August 1, Fri August 5,  Tue
0 Sat,  July  26   August 1, Fri August 5,  Tue
0.27 Sun,  July  27   August 1, Fri August 5,  Tue
0 Mon,  July  28   August 1, Fri     August 5,  Tue
0.08 Tue,  July  29   August 1, Fri August 5,  Tue
0 Wed,  July  30   August 1, Fri August 5,  Tue
1.36 Thu,  July  31   August 6, Wed August 11,  Mon
0.70 Fri,  August  1   August 6, Wed August 11,  Mon
0.18 Sat,  August  2   August 6, Wed August 11,  Mon
0.61 Sun,  August  3   August 8, Fri August 11,  Mon
0.49 Mon,  August  4   August 8, Fri     August 11,  Mon
0.02 Tue,  August  5   August 8, Fri August 11,  Mon
0.90 Wed,  August  6   August 8, Fri August 11,  Mon
0.35 Thu,  August  7   August 12, Tue August 16,  Sat
1.81 Fri,  August  8   August 22, Fri ##########
0 Sat,  August  9   August 23, Sat ##########
0 Sun,  August  10   August 24, Sun ##########
0.04 Mon,  August  11   August 25, Mon     ##########
0.88 Tue,  August  12   August 26, Tue ##########
0 Wed,  August  13   August 27, Wed ##########
0 Thu,  August  14   August 28, Thu ##########
0 Fri,  August  15   August 29, Fri  
0.38 Sat,  August  16   August 30, Sat  
0 Sun,  August  17   August 31, Sun  
0.04 Mon,  August  18   September 1, Mon      
0.43 Tue,  August  19   September 2, Tue  
0 Wed,  August  20   September 3, Wed  
0 Thu,  August  21   September 4, Thu  
0 Fri,  August  22   September 5, Fri  
0 Sat,  August  23   September 6, Sat  
0 Sun,  August  24   September 6, Sat  
0 Mon,  August  25   September 6, Sat      
0 Tue,  August  26   September 6, Sat  
0 Wed,  August  27   September 6, Sat  
0 Thu,  August  28   September 6, Sat  
0 Fri,  August  29   September 6, Sat  
0 Sat,  August  30   September 6, Sat  
0 Sun,  August  31   September 6, Sat