2002 DD Accumulation for Apple Scab Ascospore Maturity

2002 Estimated Degree-Day Accumulation (Base 32F, from McIntosh Green Tip) for Selected Sites
	^{UVM HRC ^{South Burlington Chittenden Co.} ^{Elev. 71 M}}	Shoreham Addison Co. Elev. 107 M	South Hero Grand Isle Co. Elev. 54M	Bennington Bennington Co. Elev. 370 M	Dummerston Windham Co. Elev. 171 M
Date	4/13 (GT)	4/12 (GT)	4/14(GT)	4/10 (GT)	4/13(GT)
4/14	48	73	24	91	54
4/17	147	174	122	190	153
4/22	250	287	220	304	271
4/27	293	328	266	340	312
4/30	314	349	285	361	337
5/4	361	395	335	405	387
5/11	518	555	490	559	556
5/18	622	661	595	662	674
5/26	765	800	740	792	821
6/1	973	1003	945	991	1029
6/8	1158	1187	1127	1167	1212

Degree Day and other weather information received from Skybit E-Weather Service: http://www.skybit.com/

Cumulative Percentage of Ascospores Matured at Various Degree Day Accumulations (Base=32 F)¹
Degree Days (2)	^Cumulative ^Ascospores ^{Matured (%)}	^90% ^{Confidence Interval} ^{for Estimate (3)}
35	1	0-7
¹¹⁰	³	^0-14
145	5	1-19
215	12	2-32
325	25	7-55
450	50	21-80
575	75	46-94
685	90	69-98
740	95	79-99
790	97	86-100
865	99	93-100
1-Table from "Pest Management Recommendations for Commercial Tree-Fruit Production, 1999", Cornell Cooperative Extension Publication.
2- DD should be recorded from the date when 50% McIntosh fruit buds are between silver tip and green tip. The base temperature = 32F. Data of Gadoury and MacHardy, 1982.
3-The width of the 90% confidence interval is a statistical measure of the precision of estimated maturity. It is the range within which the estimate should fall 90% of the time.

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