Tag Archives: New York State IPM program

NEWA degree day models

Let’s take a closer look at how degree days are used on NEWA. My last post explained what they are, how they are calculated, and why they are used. But where and in what ways can they be accessed?

Every NEWA weather station has a unique ‘home page’ (Figure 1). This is an easy way to access degree day models during the growing season. When you follow a model link from the station page, results are automatically generated using data from that location.

Figure 1. This is the station home page for ‘Ithaca Cornell Orchards’ in New York State.

Degree-day models are also accessible from the navigation drop-down menus (Figure 2). This method requires user input to specify the station and location of interest. This gives you an opportunity to explore historical data, which is not an option when a model is accessed from a station home page as described above.

Figure 2. NEWA degree day tools can be accessed from the navigation drop-down menus.

The NEWA degree day calculator is a popular tool (Figure 3). Once the state, location of interest, desired base model, and start date is specified, custom degree day calculations are generated. For example, when a pre-programmed model is not available you can use the calculator as long as you understand which base temperature is needed. For more information about the degree day calculator, read this great post from April 2016 that provides more details. https://blogs.cornell.edu/yourenewa/2016/04/08/new-degree-day-calculator-on-newa/

Figure 3. The NEWA degree day calculator is a popular tool that provides customized calculations.

Here is a summary of current NEWA models and tools utilizing degree day calculations.

Category Model  Base temperature
Degree day calculator Customized degree day accumulation  User defined
 Degree days  Degree day monthly summaries  User defined
 Apple insects  Apple maggot  50°F/10°C
 Codling moth  50°F/10°C
 Obliquebanded leafroller  43°F/6.1°C
 Oriental fruit moth  45°F/7.2°C
 Plum curculio  50°F/10°C
 Spotted tentiform leafminer  43°F/6.1°C
 Apple diseases  Fire blight shoot symptom development  55°F/12.8°C
 Apple Scab  32°F/0°C
 Grape  Grape berry moth  47.14°F/8.4°F
 Vegetable  Cabbage maggot  39.2°F/4°C
 Onion maggot  40°F/4.4°C

For additional information about degree days on NEWA visit the URL link below.

About Degree days http://newa.cornell.edu/index.php?page=about-degree-days


NEWA needs your help – take our online survey!

The Network for Environment and Weather Applications (NEWA) is seeking new and experienced users to take an important online survey — it will only take 10 minutes of your time. Use your smart device, tablet or desktop computer!

Take the survey now:


All responses are anonymous and confidential. They will not be shared with any outside group.

Whether you’ve used NEWA’s online pest forecast models for years or have never used NEWA at all, we will benefit from your responses. Why? Because we are building a new website at newa.cornell.edu, one that’ll be as easy to use on your smart phone as on your desktop, and we want to build it the way you want it to be.

NEWA is an online agricultural decision support system that uses real time weather data, streamed over the internet from 573 weather stations throughout the Northeast, Midwest and mid-Atlantic. NEWA provides insect and plant disease pest management tools, degree days, and weather information for growers, consultants, Extension educators, faculty, and others.

NEWA models and resources are available free of charge, and are used to make informed localized crop management decisions. The NEWA website will be upgraded soon and we want to know what users’, new and old, want and need out of the new website.

Thank you for participating!

LERGP Podcast for Grape Growers

Statewide grape IPM specialist Tim Weigle and Viticulture Extension Specialist Luke Haggerty just posted a great podcast discussing the usefulness of grape tools available through NEWA. Produced by the Lake Erie Regional Grape Program, this podcast packs a lot of great information into a quick 6 minute segment, covering insect and disease models useful for grape growers throughout the region. Tim and Luke discuss the use of NEWA to forecast grape diseases including black rot, downy mildew, powdery mildew and phomopsis cane and leaf spot. They also discuss the impact of grape berry moth on grape growers and ways in which NEWA’s forecasting model helps growers stay ahead of this pest.

Weigle’s and Haggerty’s NEWA podcast is the latest in a series produced by LERGP. Each segment provides a short commentary and discussion about topics related to grape production in the Lake Erie region or LERGP. For more information about these podcasts, visit lergp.com.