The UVM Apple Team Dr. Lorraine Berkett, Terence Bradshaw, Marlys Eddy |
The UVM Apple Program: Extension and Research for the commercial tree fruit grower in Vermont and beyond... |
|
The UVM Apple Team Dr. Lorraine Berkett, Terence Bradshaw, Marlys Eddy |
The UVM Apple Program: Extension and Research for the commercial tree fruit grower in Vermont and beyond... |
L.P.Berkett, IPM Specialist
2005 Degree Day Accumulation for Plum Curculio Oviposition
Timing Insecticide Sprays using a Predictive Model
2005 Estimated Degree-Day Accumulation (Base 50F, from 95% McIntosh Petal Fall Date) for Selected Sites |
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| Date | UVM HRC
South Burlington Chittenden Co. Elev. 71 M |
Shoreham Addison Co. Elev. 107 M |
South Hero Grand Isle Co. Elev. 54M |
Dummerston Windham Co. Elev. 171 M |
| 95% McIntosh Petal Fall Date | 5/31 | 5/25 | 5/27 | 5/23 |
5/31 |
11 |
51 |
44 |
49 |
6/04 |
82 |
118 |
117 |
108 |
6/11 |
243 |
278 |
275 |
271 |
6/18 |
366 |
404 |
399 |
391 |
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 308. Note that thisdegree day threshold is different than the recommended value in the past. Entomologists at Cornell have revised this value to reflect a correction in the metric to SAE conversions used (http://www.nysaes.cornell.edu/ent/scaffolds/2005/050516.html).
Click here for information on this pest.
Please send comments and suggestions to: lorraine.berkett@uvm.edu
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