Daily LATE BLIGHT Forecast Information From BLITECAST: Southwestern 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 Standard Site * EXPERIMENTAL SITE ** Standard Site *
BLIGHT Wash.Co: Finleyville Butler Co: Butler Cambria: Loretto
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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: 2 3 0 0 2 5e
03-09: 2 5e 6e 6e 6e 5e 6e 0 1 1 1 1 1 2 5e 9e13e16e16e15e14H
10-16: 6e 3 2 2 4H 4 2 2 1 1 2 2 2 0 13# 9# 5# 2 6# 6# 4
17-23: 2 3 4 6# 4 5# 5# 0 0 0 1 1 1 1 4 5# 5# 7# 3 3 3
24-30: 5# 6# 6# 5# 8#11#11# 2 2 2 1 2 2R 2 3 2 3 2 5# 9# 9#
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July ==================== ==================== ====================
01-07: 11# 9# 8# 7# 6# 6# 7# 2 2 2 1 0 0 0 9# 9# 8# 8# 8# 8# 8#
08-14: 7# 7# 7# 8# 7# 3 5# 0 0 0 0 0 0 0 8# 8# 8# 7# 8# 4 4
15-21: 5# 6# 6# 6# 7# 9# 6# 1 1 1 1 1 1 1 4 5# 5# 7# 5# 8# 8#
22-28: 6# 5# 5# 5# 5# 5# 9# 1 1 1 1 1 1 1 9# 8# 8# 9# 9# 7# 9#
29-31: 10#11#11# 2 2 2 11#12#13#
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August ==================== ==================== ====================
01-04: 10# 9# 8# 5# 1 1 1 1 11#10#10# 9#
05-11: 4 7#10#12#15#18#19# 0 4 5# 5# 5# 7# 7# 7# 9#10#13#14#17#18#
12-18: 20#17#14#13#11# 9# 8# 7# 3 2 2 2 1 1 20#18#16#12#12#10# 8#
19-25: 9#12#16#19#19#18#19# 1 5# 9#13#14#14#14# 6# 9#13#17#19#21#22#
26-31: 18#15#12# 9# 8# 9# 14#10# 6# 2 1 1 24#21#18#16#14#13#
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Sept. ==================== ==================== ====================
01: 7# 1 12#
02-08: 6# 6# 6# 6# 6# 5# 5# 0 0 0 0 0 0 0 9# 9# 8# 8# 7# 4 4
09-15: 7#10#12#11#10#10#11# 1 3 5# 5# 5# 5# 5# 6# 8#11#10# 9#11#13#
16-22: 9# 5# 2 2 2 1 0 4 2 0 0 0 0 0 11# 8# 5# 4 5# 4 2
23-29: 0 - - - - - - 0 - - - - - - 2 - - - - - -
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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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