| Background Information for this page | |||||||
| Return to radar list for Sanford ME | |||||||
| Chart version of thinner sensitivity ratings | |||||||
| Weather data for Sanford ME. Forecast values begin October 17, 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 - June 4, Wednesday 15mm - June 8, Sunday 18mm - June 9, Monday |
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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 26 |
sunny 9% | 15 | Reduced sensitivity |
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| 100%
Petal Fall Tue, May 27 |
21% | 3 | Stronger influence for reduced sensitivity |
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| Wed, May 28 |
sunny 1% | 1 | Reduced sensitivity |
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| Thu, May 29 |
sunny 1% | 7 | Intermediate |
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| Fri, May 30 |
sunny 4% | 7 | Intermediate -- but true sensitivity may be less because of fruit exposure to 2 or more days with high temperatures >= 75F |
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| Fruit
Set Sat, May 31 |
cloudy 51% | 10 | Increased sensitivity -- but true sensitivity may be less because of fruit exposure to 2 or more days with high temperatures >= 75F |
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| Sun, June 1 |
29% | 9 | Intermediate -- but true sensitivity may be less because of fruit exposure to 2 or more days with high temperatures >= 75F |
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| Mon, June 2 |
32% | 7 | Intermediate -- but true sensitivity may be less because of fruit exposure to 2 or more days with high temperatures >= 75F |
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| Tue, June 3 |
27% | 12 | Increased sensitivity -- but true sensitivity may be less because of fruit exposure to 2 or more days with high temperatures >= 75F |
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| Wed, June 4 |
cloudy 65% | 5 | Intermediate -- fruit >12mm probably have less sensitivity due to size and exposure to 2 or more days with high temperatures >= 75F |
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| Thu, June 5 |
cloudy 67% | 6 | 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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| Fri, June 6 |
cloudy 69% | 6 | Stronger influence for 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, June 7 |
25% | 20 | Stronger influence for 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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| Sun, June 8 |
sunny 6% | 24 | Stronger influence for 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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| Mon, June 9 |
sunny 18% | 18 | 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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| Tue, June 10 |
sunny 8% | 19 | Intermediate -- 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 11 |
sunny 11% | 15 | Intermediate -- 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 12 |
sunny 1% | 6 | Intermediate -- 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 13 |
sunny 1% | 12 | Intermediate -- 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 8% | 11 | ||||||
| cloudy 68% | 7 | ||||||