Welcome to the NEWA Apple Home Page

Apple Scab Disease Risk and Forecasting

Apple Scab Infection Events

Seasonal Apple Leaf Wetness Log (per station)

Apple Scab Ascospore Maturity Degree Day Graphs

Fire Blight Disease Risk and Forecasting -- UPGRADE COMING SOON!

Cougarblight Automated Risk Charts for Apple

Cougarblight Automated Risk Charts for Pear

Information about Cougar Blight (Washington State Univ.)

Apple Pest Biofix Table

Degree Days

Degree Day Calculator

Uses the Baskerville-Emin (BE) formula to calculate accumulated degree days. You select the base temperature (32F, 40F, 41F, 43F, 45F, 48F, 50F, or 55F), the start and end dates and the year. Operates year-round.

Apple Pest Degree Day Calculator

Calculates the accumulated degree days (F) using the Baskerville-Emin (BE) formula and provides IPM guidelines for specific apple pests based on phenological models. The calculations are made for the current year, from the biofix date to today’s date. Operates March 1 to November 1.

The following pest phenological models are covered:

Pest	Base T ºF
Codling Moth	50
Oriental Fruit Moth	45
Obliquebanded Leafroller	43
Plum Curculio	50
San Jose Scale	50
Spotted Tentiform Leafminer	43
Apple Maggot	50

Important Biofix Dates to Track

Pest	Base T	Biofix
Apple Scab	32º F	50% Green Tip Mac's
Fire Blight	65º F	First Blossom Open
Codling Moth	50º F	First Sustained Trap Catch
Oriental Fruit Moth	45º F	First Sustained Trap Catch
Obliquebanded Leafroller 1st summer gen	43º F	First Sustained Trap Catch
Plum Curculio	50º F	Petal Fall
San Jose Scale	50º F	March 1
Spotted Tentiform Leafminer 2nd gen	43º F	First Sustained Trap Catch
Apple Maggot	50º F	January 1

On-line Resources to Support Monitoring

Sampling Forms and Decision Support for Scouting and Monitoring Arthropod Pests

These are forms are also available in the Cornell Pest Management Guidelines for Commercial Tree Fruit Production to assist with scouting and monitoring for arthropod pests. They are linked here from the Fruit IPM web site.

Spotted Tentiform Leafminer (STLM)

Pink bud or early bloom stage scouting for STLM eggs (pdf)

Petal fall stage scouting for STLM sap-feeding mines (pdf)

Summer scouting for second generation STLM (pdf)

Obliquebanded Leafroller (OBLR)

Begin OBLR scouting on July 5 in WNY (5-7 days earlier in E NY or Long Island) or begin approximately 600 degree days Base 43 F after the first moth flight begins, first sustained moth catches in pheromone traps.

3% OBLR infestation threshold (pdf)

Mites

2.5 mites/leaf threshold scouting in June (pdf)

5 mites/leaf threshold scouting in July (pdf)

7.5 mites/leaf threshold scouting August 1 to 15 (pdf)

Apple Maggot (AM) scouting form (pdf)

Scouting and Monitoring Summary Form (pdf)

For Further Information:

Fruit IPM Fact Sheets Information on many insect pests, mites, and diseases of tree fruit.

Pest Management Guidelines for Commercial Tree-Fruit Production contains the current year's tree fruit management information compiled by Cornell University extension faculty, including useful apple scab and fire blight information and scouting and monitoring forms for arthropod pests.

Scaffolds: Fruit Journal Weekly extension newsletter produced by Art Agnello, Entomology Dept, Cornell University, Geneva, during the growing season. Contact Art Agnello for subscription information.

Fruit IPM Resources

for more information on tree fruit pest management.

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