Author Archives: Dan Olmstead

NEWA apple pollen tube growth model now available

A new model that helps apple growers precisely time thinning sprays during bloom is available in time for the 2019 growing season on the NEWA website. It is called the pollen tube growth model (PTGM).

Developed by Greg Peck, Assistant Professor of Horticulture at Cornell University, PTGM expands available apple management options for apple producers, helping those who use bloom thinning to increase the chances of ideal crop load at harvest.

Peck collaborated with researchers at Virginia Tech to adapt their existing PTGM model for use on the NEWA platform, linking real-time hourly weather data with pollen tube growth rates collected under controlled temperature conditions.

Apple varieties in the pollen tube growth model include Fuji, Gala, Golden Delicious, Granny Smith, Honeycrisp, Red Delicious, and Pink Lady.

An article by Peck and Olmstead was published in the Spring 2019 issue of Fruit Quarterly that provides instruction and technical information about the PTGM. It also describes the research, justification, and logic for model development. Click the link below to view a PDF version of the article.

Implementing the Pollen Tube Growth Model on NEWA

If you are a New York producer and have additional questions about the PTGM, reach out to your regional extension specialist to learn more about this model.

Table 2. NY apple extension specialists.

Affiliation Name
New York State IPM Program Julie Carroll
Cornell Cooperative Extension Lake Ontario Fruit Team Craig Kahlke
Mario Sazo
Cornell Cooperative Extension Eastern New York Horticulture Team Mike Basedow (northern NY)
Dan Donahue (Hudson Valley)

Outside of NY, get in touch with your NEWA state coordinator to ask about local extension resources, expertise, and applicability of the PTGM in your area.

Table 3. NEWA state coordinators.

Region Entity State coordinator
Connecticut University of Connecticut
UConn Extension
Mary Concklin
Massachusetts University of Massachusetts
UMass Extension
Jon Clements
Michigan Michigan State University
Enviroweather Program
Beth Bishop
Minnesota Minnesota Apple Growers Association
JP Jacobson
New Hampshire University of New Hampshire
UNH Cooperative Extension
Cheryl Smith
New Jersey Rutgers University
Rutgers Cooperative Extension
Peter Oudemans
New York Cornell University | NEWA
New York State Integrated Pest Management Program
Dan Olmstead
North Carolina North Carolina State University
North Carolina Cooperative Extension
Mike Parker
Ohio The Ohio State University
Matt Wallhead
Pennsylvania Penn State University
Penn State Extension
Rob Crassweller
Vermont University of Vermont
UVM Extension
Terence Bradshaw
Virginia Virginia Tech
Virginia Cooperative Extension
Mizuho Nita
540-869-2560 x33
West Virginia West Virginia University
WVU Extension Service
M.M. Rahman
Wisconsin University of Wisconsin
UW Extension
Amaya Atucha
All other regions Cornell University | NEWA
New York State Integrated Pest Management Program
Dan Olmstead


Julie Carroll Earns 2019 Excellence in IPM Award


Media contact: Jennifer Grant | Office: 315-787-2353 |

For photos:

Formidable Fruit Doyenne Earns Excellence in IPM Award

GENEVA NY, March 1, 2019: Dr. Juliet Carroll, Fruit IPM Coordinator, received an Excellence in Integrated Pest Management (IPM) Award from the New York State Integrated Pest Management Program (NYSIPM) at the Viticulture day of the B.E.V. (Business, Enology, Viticulture) conference in Rochester. NYSIPM develops sustainable ways to manage pests and helps people to use methods that minimize environmental, health and economic risks. The award honors individuals who encourage the adoption of IPM in their businesses, schools, communities, and farms, and who develop new tools and tactics for sharing these practices.

Vital. Invaluable. These are words used to describe Julie Carroll’s IPM contributions by her colleagues. Carroll spearheaded the expansion of NEWA, a website and network which allows growers to understand how the weather will affect fungal and insect pests, and takes the guess work out of their pest management strategy. Carroll ran NEWA for over a decade. Timothy Weigle credits NEWA’s growth in not only weather stations, but also the number of states participating, to Julie’s guidance. Under her leadership NEWA went from 45 weather stations in New York State to over 500 in 12 states. He notes further that her work on improving the user experience with the grape disease and grape berry moth models on NEWA, along with Wayne Wilcox and Greg Loeb, had an enormous impact on the implementation of grape IPM in New York.

Laura McDermott, Regional Extension Specialist in Hudson Falls, NY, noted Dr. Carroll’s passion for integrating pest management strategies, and called her “a determined perfectionist.”

Carroll also led the development of Trac software. Introduced in the early 2000s, the software simplified and digitized pesticide recordkeeping for large and small growers and processors alike. It allows farmers to input the information once, and generate customized reports for different processors. The software also includes reference to “IPM Elements” for grapes and other crops—a tool that helps growers assess their pest management practices. Grape processors across the state, including Constellation Brands, use TracGrape’s reports for their pesticide reporting requirements. Carroll built Trac software for five fruit crops, and partnered with a colleague to create TracTurfgrass for golf, lawns, sports fields and sod farms.

Luke Haggerty, of Constellation Brands, calls Carroll’s TracGrape software “a true breakthrough” in record keeping. As a Grower Relations rep for Constellation, he relies on information provided by NEWA: “Julie has always been very proactive in developing and delivering the products needed for our growers to produce grapes in an environmentally and economically sustainable way.”

Tim Martinson, Cornell Cooperative Extension Viticulture specialist, noted, “IPM is built on information and decision-making tools. Juliet has built TracGrape and NEWA into useful, practical tools for growers.”

Dr. Carroll also co-edited Organic Production and IPM Guides for grapes and several berry crops, and has regularly presented at Lake Erie Regional Grape Growers’ conferences and Coffee Pot meetings. She has conducted research on devastating pests such as the Spotted Wing Drosophila (SWD)—investigating whether hungry hummingbirds can provide meaningful control. Dr. Carroll has also chaired the Northeast IPM SWD working groups for the last decade, bringing research scientists, growers, industry reps, and extension educators from across the region together to help find solutions. Carroll has also helped fruit growers with bird management. Tim Weigle noted that her bird-scaring tactics have saved everyone a lot of money and are more popular than the traditional neighbor-alienating air cannon.

Learn more about Integrated Pest Management at

New York State expertise for NEWA tools and resources

Last updated 3/19/19

NEWA offers 23 different fruit and vegetable models and all use real-time weather data to generate research-based crop guidelines for growers in New York State and beyond. Extension specialists across the state provide expertise in different commodity areas and are available to provide management expertise and consultation regarding the utilization of NEWA guidelines on your farm.

Use this guide to locate a fruit or vegetable specialist in your region of New York. Click the hyperlinks to learn more about a specific NEWA model, extension program, or commodity specialist.

NEWA Apple Resources

Apple diseases. Fire blight, apple scab, sooty blotch fly speck.

Apple insects. Apple maggot, codling moth, obliquebanded leafroller, oriental fruit moth, plum curculio, San Jose scale, spotted tentiform leafminer.

Apple management. Blossom thinning, carbohydrate fruit thinning, irrigation modeling.

Affiliation Name
New York State IPM Program Julie Carroll
Cornell Cooperative Extension Lake Ontario Fruit Team Craig Kahlke
Mario Sazo
Tessa Grasswitz
Cornell Cooperative Extension Eastern New York Horticulture Team Mike Basedow (northern NY)
Dan Donahue (Hudson Valley)

NEWA Grape resources

Grape diseases. Black rot, phomopsis, powdery mildew, downy mildew.

Grape insects. Grape berry moth

Affiliation Name
Cornell Cooperative Extension Lake Erie Regional Grape Program Tim Weigle (New York State IPM Program)
Jennifer Russo
Andy Muza (Penn State Extension)
Cornell Cooperative Extension Finger Lakes Grape Program Hans Walter-Peterson
Cornell Cooperative Extension Eastern New York Horticulture Program Jim Meyers
Cornell Cooperative Extension of Suffolk County Alice Wise

NEWA Vegetable resources

Vegetable diseases. Onion diseases, potato diseases, tomato diseases.

Vegetable insects. Cabbage maggot, onion maggot.

Affiliation Name
New York State IPM Program Abby Seaman
Cornell Cooperative Extension Vegetable Program Elizabeth Buck
Christie Hoepting
Judd Reid
Cornell Cooperative Extension Eastern New York Horticulture Program Chuck Bornt
Teresa Rusinek
Maire Ullrich
Cornell Cooperative Extension of Suffolk County Sandra Menasha