Daily LATE BLIGHT Forecast Information From BLITECAST: Eastern 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 SITE ** EXPERIMENTAL SITE ** Standard Site * EXPERIMENTAL SITE **
BLIGHT Dauphin: Gratz Schuylkill: Ringtown Lehigh: Germanville Berks: Kutztown
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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 Su Mo Tu We Th Fr Sa
== == == == == == == == == == == == == == == == == == == == == == == == == == == ==
June ==================== ==================== ==================== ====================
01-02: 1 2 0 1 5e 7e 0 0
03-09: 1 4 4 4 4 4 3 1 4 5e 5e 5e 5e 4 7e 9e12e12e12e11H10# 0 3 4 4 4 4 4
10-16: 3 0 0 1 2 2 2 4R 1 1 2 2 2 2 9# 8# 7#11#13#12#12# 4R 1 1 2 2 2 2
17-23: 2 2 2 2 2 2 2 2 2 2 2 2 2 2 14#12#12#10# 7# 9# 8# 2 2 2 2R 2 2 2
24-30: 2 2 3 2 3 5R 5# 2 2 3 2 3 5# 5# 6# 7# 8# 7# 9#12#13# 2 2 3 2 3 4 4R
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July ==================== ==================== ==================== ====================
01-07: 5# 5# 4 4 5# 3 5# 5# 5# 4 4 5# 3 5# 13#11# 9#10#12#11#10# 4 4 3 3 4 3 5#
08-14: 5# 5# 5# 5# 3 1 1 5# 5# 5# 5# 3 1 1 11#11#12#10# 8# 5# 5# 5# 5# 5# 5# 3 1 1
15-21: 1 1 1 0 0 0 0 1 1 1 0 0 0 0 4 4 4 4 3 4 4 1 1 1 0 0 1 1
22-28: 0 0 0 0 0 0 2 0 0 0 0 0 0 1 4 5# 8# 8# 9# 9#11# 1 1 1 1 0 0 0
29-31: 3 5# 5# 2 3 3 14#15#13# 1 2 2
==================== ==================== ==================== ====================
August ==================== ==================== ==================== ====================
01-04: 5# 5# 6# 4 3 3 3 3 13#12#12#11# 2 2 3 3
05-11: 3 2 1 1 1 3 3 2 2 1 1 1 3 3 8# 8# 8# 9# 8#10#13# 1 1 2 2 2 4 4
12-18: 3 2 2 3 3 1 1 3 2 2 3 3 1 1 14#13#11#10#12#10# 6# 4 3 2 3 3 1 1
19-25: 1 2 6#10#13#15#17# 1 1 5# 9#11#13#16# 6# 8#12#16#18#21#26# 1 4 8#12#14#15#17#
26-31: 18#17#14#10# 7# 5# 16#15#12# 8# 6# 4 27#25#23#21#19#17# 17#14#11# 7# 5# 4
==================== ==================== ==================== ====================
Sept. ==================== ==================== ==================== ====================
01: 3 2 13# 2
02-08: 2 1 0 0 0 0 0 2 1 0 0 0 0 0 11# 9# 8# 8# 8# 8#10# 2 1 0 0 0 0 0
09-15: 0 0 1 3 3 3 4 0 1 2 4 4 4 5# 12#13#15#11#13#14#14# 0 1 2 4 4 4 4
16-22: 4 4 3 1 1 2 1 6# 5# 4 2 2 2 1 12#10# 7# 5# 6# 5# 6# 4 3 2 0 0 0 1
23-29: 1 - - - - - - 0 - - - - - - 8# - - - - - - 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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Where trade names are used, no discrimination is intended
and no endorsement by the Cooperative Extension Service is implied.
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