Daily LATE BLIGHT Forecast Information From BLITECAST: Northwestern PA, 2007
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For Tomatoes and Potatoes ##############################################
========================= # * = Standard sites through Sep 23 #
# ** = EXPERIMENTAL SITES through Sep 23 #
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How favorable is daily weather for LATE BLIGHT development? Values presented
in calendar format indicate favorability of weather for LATE BLIGHT development.
Key: 0-4 = Conditions not very favorable for LATE BLIGHT (0 = least favorable).
5-28 = Conditions favorable enough to warrant fungicide (28 = most favorable).
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LATE EXPERIMENTAL ONLY ** EXPERIMENTAL ONLY ** EXPERIMENTAL ONLY **
BLIGHT Erie: Fairview Erie: Corry Potter: Sweden Valley
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Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa
== == == == == == == == == == == == == == == == == == == == ==
June ==================== ==================== ====================
01-02: 0 0 0 0 0 0
03-09: 0 0 0 0 0 1 1 0 1 1 1 1 2 2 0 2 2 2 2 3 3
10-16: 1 1 1 1R 1 1 1 2 1 1 1R 1 1 1 3 1 1 1R 1 1 0
17-23: 0 0 0 0 0 0 0 0 0 0 2 2 2 2 0 0 0 0 0 0 0
24-30: 1 1 1 1 1 1 1 3 3 3 1 1 1R 1 0 0 0 0 1 1 1
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July ==================== ==================== ====================
01-07: 0 0 0 0 1 1 1 1 0 0 0 1 1 1 1 1 1 1 1 1 2
08-14: 1 1 1 1 0 0 0 1 1 1 1 0 0 0 2 2 2 2 1 0 0
15-21: 0 0 0 2 2 2 2 0 0 0 2 3 3 3 0 0 0 1 1 1 1
22-28: 2 3 3 1 1 1 1 3 3 3 1 1 1 1 2 2 2 1 1 1 2
29-31: 1 1 1 2 2 2 3 3 3
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August ==================== ==================== ====================
01-04: 1 1 1 1 1 1 1 1 3 3 3 2
05-11: 1 4 6#10#10#13#13# 0 3 5# 9# 9#11#12# 0 0 1 3 3 4 4
12-18: 13#10# 7# 3 3 1 1 12# 9# 8# 4 4 1 1 5# 5# 4 2 2 1 1
19-25: 1 1 5# 7# 9#10#10# 1 2 6#10#12#13#13# 1 0 3 7# 9#10#11#
26-31: 10#10# 6# 4 2 1 13#12# 8# 4 2 1 11#11# 8# 5# 4 4
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Sept. ==================== ==================== ====================
01: 1 1 4
02-08: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 3 3 2 2 1 1
09-15: 2 6# 6# 6# 7# 7# 7# 2 6# 6# 6# 7# 7# 7# 3 6# 8# 8# 8# 8# 8#
16-22: 5# 1 1 1 1 0 0 5# 1 1 1 1 2 1 6# 3 1 1 1 2 1
23-29: 0 - - - - - - 1 - - - - - - 1 - - - - - -
==================== ==================== ====================
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Key: # = BLITECAST indicates late blight protection most important these days.
Values based on measured Temperature, Relative Humidity, Wetness, & Rain.
e = Early = BLITECAST indicates that recent weather was favorable for late
blight development but the initial thresholds (CS18; 10BFD) were not
reached yet.
R = Rain+Temperature based threshold (10BFD) = 10 Consecutive Blight
Favorable Days. If inoculum is present, symptoms are expected in
about 7-14 days.
H = Humidity+Temperature based threshold (CS18) = 18 Cumulative Severity
Values for the season. If inoculum is present, symptoms are expected
in about 7-14 days.
* STANDARD SITE: Disease forecast developed from quality on-site
calibrated environmental measurements.
** EXPERIMENTAL SITE: Disease forecast developed from experimental data;
calibration is in progress. Forecast is for experimental use only.
Compare results for Experimental sites with results from nearby
Standard sites before considering information from an Experimental site.
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developed by Dr. Alan A. MacNab, Professor, Plant Pathology
Penn State College of Agricultural Sciences
211 Buckhout Lab, University Park, PA 16802
Updated: Sep 24, 2007; EMH
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here trade names are used, no discrimination is intended
and no endorsement by the Cooperative Extension Service is implied.
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