| Background Information for this page | |||||
| Return to radar list for Greenville RI | |||||
| This table estimates fungicide intervals for suppressing spread of secondary scab if it should occur. Use the appropriate primary scab respray guidelines instead of this table until ascospore releases are completed. Rules used to estimate protection depletion change after fruit set and again after terminal bud set. See Background Information page for details. | |||||
| Brown text with grey background indicates dates when 2nd generation scab lesions from the
final ascospore release have had time to begin appearing. After this date it is possible to confirm
the status of primary scab control. If
successful control of primary apple scab infections has been confirmed, this
table is no longer needed, and fungicide application dates can be made with
the extended intervals adequate to prevent flyspeck and other summer
diseases. But if there are enough active scab infections present to cause an unacceptable risk of fruit scab infection, this table provides estimates for respray dates to keep scab infections from spreading. If active lesions are found, fungicide protection is needed until those lesions exhaust their supply of spores, which takes about 4 weeks. Depending on scab severity, market sensitivity, temperature, 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. |
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| The estimated date
for 95+% scab ascsopore release at this site is May 9. The estimated McIntosh fruit set date for this site is May 5. The approximate terminal bud set date for this site is June 23. |
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| Weather data for Greenville RI. Forecast values begin May 17, 2012 | |||||
| Previous Spray Date Estimates assume that fungicide was applied BEFORE rain on spray date |
Inches Rain | Protection
End Date against Secondary Scab for full-dose captan, mancozeb or other protectant fungicide |
Percent primary scab potential beginning to show as (1st generation) & 2nd gen. lesions by protection end date |
Respray
Deadline = Start date for next scab infection period after protection ends |
|
| Tue, May 8 | 0.20 | May 11, Fri | (74%) | 1% | May 15, Tue |
| Wed, May 9 | 1.06 | May 16, Wed | (90%) | 2% | May 22, Tue |
| Thu, May 10 | 0.75 | May 21, Mon | (98%) | 74% | May 22, Tue |
| Fri, May 11 | 0 | May 22, Tue | (98%) | 74% | May 22, Tue |
| Sat, May 12 | 0 | May 23, Wed | (98%) | 74% | Too early to estimate |
| Sun, May 13 | 0 | May 24, Thu | (98%) | 74% | |
| Mon, May 14 | 0 | May 25, Fri | (98%) | 89% | |
| Tue, May 15 | 0.57 | May 27, Sun | (100%) | 90% | |
| Wed, May 16 | 0.58 | May 28, Mon | (100%) | 90% | |
| Thu, May 17 | 0 | May 29, Tue | 90% | ||
| Fri, May 18 | 0 | May 30, Wed | 90% | ||
| Sat, May 19 | 0 | Too early | 90% | ||
| Sun, May 20 | 0 | Too early | 98% | ||
| Mon, May 21 | 0 | Too early | 98% | ||
| Tue, May 22 | 0.41 | Too early | 98% | ||
| Wed, May 23 | 0.16 | Too early | 98% | ||
| Thu, May 24 | 0 | Too early | 98% | ||
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