This is the update version of the 1999 Primary Apple Scab Infection Periods for the Peach Ridge Weather Station in Sparta Michigan.

1999 Peach Ridge Data Version June 9, 1999

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Rain  No.	Stage McIntosh	Date	Start Time	Rainfall	Hours	Ave. Temp. Fo	Mills Severity	*Spores /rod	Index	DD Base 32	%  Mature Spores	Predicted Lesion  Date	Date  Lesion Found
1.	1st Green	4-3	6:00 pm	.74	40	46	Heavy	3	Light	35	1	4-25
2.	1st Green	4-6	6:30 am	.16	4	52	None	6	Light	84	2	4-27
3.	Green Tip	4-8	11:00 pm	.82	17	43	None	43	Light	125	4	4-30
4.	1/4" Green	4-11	3:30 am	.39	31	35	None	55	Light	155	7	5-1
5.	1/2" Green	4-16	6:30 am	.17	41	40	Moderate	70	Light	224	10	5-3
6.	1/2" Green	4-19	6:00 pm	.07	16	37	None	22	Light	254	14	5-4
7.	Tight Cluster	4-22	1:00 am	3.05	36	45	Moderate	55	Light	299	23	5-6	5-7
8.	Full Bloom	5-5	1:00 pm	.04	3	66	None	55	Light	603	80	5-16	5-15??
9.	Full Bloom	5-6	2:00 pm	.01	1	65	None	105	Light	632	85	5-17
10.	Full Bloom	5-8	9:00 am	.09	24	50	Moderate	12	Light	678	90	5-19	5-20
11.	Petal Fall	5-12	6:30 am	1.22	10.5	49	None	155	Light	768	97	5-22
12.	7 DAPF	5-16	6:30 am	.01	2.5	57	None	12	Light	880	100	5-27
13.	7 DAPF	5-16	7:30 pm	1.34	13	66	Moderate	71	Light	880		5-27	5-31
14.	8 DAPF	5-17	5:00 pm	.97	41	57	Heavy	42	Light	919		5-28	5-31
15.	13 DAPF	5-22	7:00 am	0	2	60	None	9	Light	1070		6-2
16.	14 DAPF	5-23	10:30 am	.78	36	50	Heavy	15	Light	1096		6-3
17.	21 DAPF	5-30	12:00 am	.96	29	66	Heavy	43	Light	1287		6-8
18.	24 DAPF	6-2	3:00 am	.28	24	67	Heavy	1	Light	1391		6-11

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*Actual spore counts collected from a Peach Ridge commerical orchard that had scab last year.  **Data based on B-E DD calculations. Rain 7. Lesion found on 5-7 on bottoms of leaves 4 and 5 in light numbers. Rain 8. & 9. Quite variable in the area. Rain 8. & 9. Lesions found on the tops of leaves 6-8 in light numbers in Lowell. Rain 10.  Lesions found on the tops of many leaves, some secondary, and some leaves have sheet scab in Lowell area Rain 13. & 14. Lesions found on the tops of leaves in heavy numbers and found on fruit.
Spores levels guide		Spore Maturity Guide
		DD Base 32 Fo	% Mature Spores
Light Moderate Heavy	0-3000 3000-6000 6000+	320 445 565 736 750 765 800 830 880	25 50 75 95 96 97 98 99 100