2001 DD Accumulation for Plum Curculio

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The UVM Apple Team

Dr. Lorraine Berkett, Dr. Elena Garcia,

Terence Bradshaw and Jessica Reardon

The UVM Apple Program:

Extension and Research for the commercial tree fruit grower in Vermont and beyond...

Vermont Apple IPM Focus

2001 Estimated Degree-Day Accumulation (Base 50F, from 95% McIntosh Petal Fall Date) for Selected Sites
Date	^{UVM Hort.Res.Center South Burlington Chittenden Co. Elev. 71 M}	Shoreham Addison Co. Elev. 107 M	South Hero Grand Isle Co. Elev. 54M	East Dorset Bennington Co. Elev. 408 M	Dummerston Windham Co. Elev. 171 M	Franklin Franklin Co. Elev. 137 M
95% McIntosh Petal Fall Date	05/21	05/17	05/18	05/28	05/14	05/23
05/27	78	99	104	-	89	54
06/02	110	132	134	26	124	81
06/09	179	200	204	79	194	147
06/16	321	335	345	197	328	288
06/23	453	463	478	311	462	415
06/30	590	598	616	438	607	551

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

Beginning at petal fall, cumulative heat units are recorded using a base temperature of 50°F. Daily heat units can be calculated as (Max+Min)/2-50 where Max and Min are maximum and minimum temperatures. If this quantity is less than zero, no heat units are accumulated. Daily heat units are summed beginning at petal fall and no further insecticide applications are required provided the last insecticide was applied no later than 10 to 14 days prior to the date when summed units reach 340.