2002 DD Accumulation for Plum Curculio

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The UVM Apple Team

Dr. Lorraine Berkett, Dr. Elena Garcia,

Terence Bradshaw, Chris Benedict

The UVM Apple Program:

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

Vermont Apple IPM Focus

2002 Estimated Degree-Day Accumulation (Base 50F, from 95% McIntosh Petal Fall Date) for Selected Sites
Date	^{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
95% McIntosh Petal Fall Date	5/26	5/15	5/26	5/23	5/17
5/26	8	54	7	30	51
6/1	111	151	108	123	151
6/8	179	221	172	185	217
6/15	255	307	246	266	300
6/22	352	402	344	348	392

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.