This is the FINAL version of the 1997 Primary Apple Scab Infection Periods for the Peach Ridge Weather Station in Sparta Michigan.
1997 Peach Ridge Data FINAL Version June 26, 1997
Rain
No.
Stage
McIntosh
Date
Start
Time
Rainfall
Hours
Ave.
Temp.
Fo
Mills
Severity
*Spores
/rod
Index
DDBase
32
% Mature
Spores
Predicted
Lesion
Date
Date
Lesion
Found
Silver Tip
4-4
3:30 am
.08
7.5
47
None
2
Light
0
0
1.
1st Green
4-5
4:30 am
.44
14.5
55
Light
5
Light
0
0
5-2
2.
1st Green
4-11
5:30 pm
.59
41.0
32
None
0
None
22
1
5-4
3.
1st Green
4-15
11:30 pm
.32
11.5
46
None
3
Light
53
2
5-6
4.
Green Tip
4-21
10:00 am
.01
2.0
45
None
0
None
112
3
5-9
5.
1/4" Green
4-24
5:00 pm
.30
12.0
46
None
60
Moderate
162
5
5-12
6.
1/2" Green
4-30
8:00 pm
.25
16.0
46
Light
600
Heavy
274
17
5-21
5-26
7.
1/2" Green
5-2
1:00 pm
.31
20.0
44
Light
675
Heavy
300
23
5-23
5-26
8.
Tight Cluster
5-5
11:00 am
.27
~11.0
54
Variable
210
Moderate
329
25
5-24
5-26
9.
Tight Cluster
5-8
12:30 am
.68
16.0
49
Light
~1000
Heavy
403
40
5-28
5-29
10.
Open Cluster
5-11
1:30 pm
.01
1.0
60
None
9
Light
450
50
5-29
11.
Open Cluster
5-14
8:00 am
.23
28.0
41
Light
1860
Heavy
482
62
5-31
5-31
12.
Pink
5-16
4:30 pm
.08
20.0
38
None
90
Light
499
62
6-1
13.
Pink
5-18
7:30 pm
.32
21.0
56
Moderate
300
Light
535
68
6-2
6-3
14.
Full Bloom
5-29
3:00 am
.25
31
56
Heavy
660
Heavy
763
97
6-9
6-9
15.
Petal Fall
6-6
1:30 pm
.07
13
59
Moderate
-
No Rain
998
100
6-16
16.
17 DAPF
6-16
2:30 am
.78
11.5
62
Light
24
Light
1327
6-25
6-26
17.
21 DAPF
6-20
8:30 am
3.00
45.0
67
Heavy
0
1466
6-28
May 26 lesions were found on the bottom of leaves in light numbers and on leaves 3, 4, and 5.
May 29 and 30 lesions were found on bottoms and tops in light numbers and on leaves 3, 4, and 5.
May 31 lesions were found on tops in light numbers and on leaves 3, 4, and 5. These lesions may be part of the May 29 lesions.
June 3 lesions were found on tops in light numbers and on leaves 4 and 5.
June 9 lesions were on the tops of leaves 6, 7 and 8 in sheets. Fruitlet stems also had scab lesions. Some fruitlets had sheet scab lesions a few days later.
June 26 lesions were found on the tops of leaves 9, 10 and 11.
Rain 8. The rain was quite varible between areas. No prediction is possible.
Rain 9. The spore discharge is an estimate.
Rain 15. No rain fell at the scab station.
*Actual spore counts collected from a Peach Ridge commerical orchard that had scab last year.
**Data based on B-E DD calculations.
Spores levels guide
Spore Maturity Guide
DD Base 32 Fo
% Mature Spores
Light
Moderate
Heavy
0-50
50-500
500+
320
445
565
736
750
765
800
830
880
25
50
75
95
96
97
98
99
100