| Background Information for this page | |||||||
| Return to radar list for Greenville RI | |||||||
| Chart version of thinner sensitivity ratings | |||||||
| Weather data for Greenville RI. Forecast values begin August 3, 2008 | |||||||
| Other factors may outweigh the summary
statements made below! Other influences include: fruit diameter, fruit exposure to temperatures >=75 F, pollination, this year's cropload, last year's cropload, warm February-early April temperatures, frost and prolonged cool and cloudy weather during bloom, previous fall weather, foliage condition last summer) Ratings below are for the influence of weather on fruit sensitivity to chemical thinning agents. Ratings assume fruit are less than 13mm diameter. Dates in bottom rows are beyond 18mm diameter for most cultivars, and are intended only for late cultivars. Look at your fruit! |
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| Rough guess McIntosh King fruit diameter dates: 12mm - May 28, Wednesday 15mm - May 31, Saturday 18mm - June 3, Tuesday |
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| Date after which fruit have exposure to 2 days of daily high temperature of at least 75 F: Thursday, May 29 | |||||||
| Very warm night temperatures (> 69F)
can lead to "EXCESSIVE THINNING RISK", especially if combined with cloudy weather or if NAA is used as thinning agent. Warm nights + Cloudy days -----> Increased sensitivity, maximum thinning. Warm nights + Sunny days -----> Intermediate senstivity, moderate thinning. Cool nights + Cloudy days -----> Reduced sensitivity Cool nights + Sunny days -----> Reduced sensitivity, minimum thinning. |
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| Postbloom thinner Application date Calculations assume morning application. If thinner applied after noon, use rating for next day. |
% CLOUD SHADING Arbitrary categories: 40% or more = "cloudy" 20% or less = "sunny" High shading on 3 days after application increases thinning response. |
AVERAGE NIGHT TEMPERATURE relative to 50 F threshold for following 7pm--7am. Example: Avg. 52F night temp = 2. Values rounded for display, and range from 0 to 20+. High temperature for 3 nights after application increases thinning response. |
SUMMARY of weather influence on sensitivity of fruit to thinning agents applied on morning of listed date Ratings assume fruit are within susceptible diameter range for thinning. |
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| McIntosh
95% Petal Fall Mon, May 12 |
cloudy 47% | 0 | Stronger influence for reduced sensitivity |
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| 100%
Petal Fall Tue, May 13 |
sunny 8% | 1 | Stronger influence for reduced sensitivity |
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| Wed, May 14 |
sunny 1% | 2 | Stronger influence for reduced sensitivity |
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| Thu, May 15 |
cloudy 45% | 3 | Reduced sensitivity |
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| Fri, May 16 |
35% | 0 | Stronger influence for reduced sensitivity |
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| Sat, May 17 |
sunny 19% | 8 | Reduced sensitivity |
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| Fruit
Set Sun, May 18 |
sunny 19% | 2 | Stronger influence for reduced sensitivity |
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| Mon, May 19 |
32% | 0 | Stronger influence for reduced sensitivity |
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| Tue, May 20 |
sunny 20% | 0 | Stronger influence for reduced sensitivity |
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| Wed, May 21 |
sunny 18% | 2 | Stronger influence for reduced sensitivity |
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| Thu, May 22 |
cloudy 51% | 0 | Reduced sensitivity |
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| Fri, May 23 |
sunny 17% | 4 | Reduced sensitivity |
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| Sat, May 24 |
31% | 3 | Intermediate |
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| Sun, May 25 |
sunny 1% | 6 | Intermediate |
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| Mon, May 26 |
sunny 2% | 12 | Reduced sensitivity |
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| Tue, May 27 |
25% | 7 | Reduced sensitivity |
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| Wed, May 28 |
sunny 2% | 1 | Reduced sensitivity -- sensitivity may be less if fruit diameter is >12mm |
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| Thu, May 29 |
sunny 0% | 9 | Increased sensitivity -- sensitivity may be less if fruit diameter is >12mm |
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| Fri, May 30 |
sunny 4% | 12 | Increased sensitivity -- fruit >12mm probably have less sensitivity due to size and exposure to 2 or more days with high temperatures >= 75F |
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| Sat, May 31 |
cloudy 47% | 11 | Increased sensitivity -- fruit >15mm may have minimal sensitivity due to size and exposure to 2 or more days with high temperatures >= 75F |
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| Sun, June 1 |
22% | 9 | Intermediate -- fruit >15mm may have minimal sensitivity due to size and exposure to 2 or more days with high temperatures >= 75F |
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| Mon, June 2 |
sunny 17% | 9 | Increased sensitivity -- fruit >15mm may have minimal sensitivity due to size and exposure to 2 or more days with high temperatures >= 75F |
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| Tue, June 3 |
sunny 8% | 15 | Increased sensitivity -- fruit > 18mm are probably beyond predictable chemical thinning due to size and exposure to 2 or more days with high temperatures >= 75F |
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| Wed, June 4 |
cloudy 66% | 7 | Increased sensitivity -- fruit > 18mm are probably beyond predictable chemical thinning due to size and exposure to 2 or more days with high temperatures >= 75F |
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| Thu, June 5 |
cloudy 66% | 6 | Increased sensitivity -- fruit > 18mm are probably beyond predictable chemical thinning due to size and exposure to 2 or more days with high temperatures >= 75F |
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| Fri, June 6 |
cloudy 68% | 7 | Stronger influence for Increased sensitivity -- fruit > 18mm are probably beyond predictable chemical thinning due to size and exposure to 2 or more days with high temperatures >= 75F |
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| Sat, June 7 |
sunny 17% | 23 | Stronger influence for Increased sensitivity -- fruit > 18mm are probably beyond predictable chemical thinning due to size and exposure to 2 or more days with high temperatures >= 75F |
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| Sun, June 8 |
sunny 8% | 23 | Stronger influence for Increased sensitivity -- fruit > 18mm are probably beyond predictable chemical thinning due to size and exposure to 2 or more days with high temperatures >= 75F |
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| sunny 6% | 23 | ||||||
| sunny 3% | 24 | ||||||