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Major Change in Pesticide Labeling and New Active Ingredients

Product Review Description

What is a New Active Ingredient Pesticide Product or Major Change in Labeling?

New Active Ingredient (NAI)
Products containing a new active ingredient are those with an active ingredient not contained in any pesticide product currently registered with the NYSDEC.

Major Change in Labeling (MCL) (also referred to as major change in use pattern)
A change in the general use pattern involving a category or site previously not registered for the active ingredient. Examples include, but are not limited to:

  • addition of terrestrial food or nonfood use
  • aquatic food and nonfood use
  • domestic outdoor use
  • indoor use
  • forestry use
  • greenhouse food or nonfood

Additionally, a change that is likely to increase the exposure of any non-target organism or that increases the potential for significant impact to humans, property, or the environment. Examples include, but are not limited to:

  • addition of aerial application
  • addition of direct soil application
  • addition of a major crop

Why are MCL and NAI applications reviewed?

Products containing new active ingredients or representing major changes in labeling are reviewed in depth because they represent new potential for exposure to humans, fish and wildlife resources, and the groundwater and surface water resources of New York State.

Who reviews these applications?

These products are first reviewed by the United States Environmental Protection Agency (USEPA). However, potential exposure to a pesticide may vary depending on regional use practices, an area's vulnerability to contamination, and regulations applicable to that area. USEPA's task is to evaluate risks and benefits of pesticides to the nation as a whole.

New York State has special circumstances that are not necessarily reflected in USEPA decisions and requirements. Evaluating pesticide exposure at the state level is very important to assure that factors unique to an area are considered during the registration review.

Applications are distributed to reviewers in the New York State Department of Health; the DEC Division of Fish, Wildlife, and Marine Resources; and the DEC Division of Materials Management's groundwater review staff. Analytical methods are distributed to the DEC's laboratory staff for review.

Application Form and Data Requirements

DEC requires registrants to submit USEPA reviews and/or data evaluation record reports and occasionally the original studies, when needed, in order to conduct our review.

DEC is streamlining the NAI and MCL review process. A properly completed application package, with all questions on the form answered and all required attachments included, is the first step to improve efficiency in the review process. Submitting complete applications will benefit the registrants and their customers. One determination of incompleteness for an application can add approximately 100 days to the overall time that the application is pending registration in New York State. We recommend you review the data checklist for Conventional Pesticides (PDF, 230 KB) and checklist for Microbial Pesticides (PDF, 149 KB).

In addition to the checklist of supporting data, the following are required to be submitted:

Pre-application Meeting

DEC strongly suggests that a pre-application meeting be held in order to discuss the product and its characteristics, as well as potential New York State concerns and data requirements. Please email the Pesticide Product Registration Section or call 518-402-8768.

Time Frames for DEC Review

According to the Environmental Conservation Law §33-0704 the DEC must make a completeness decision for an application within 60 days of receipt. If an application is deemed incomplete, the applicant is notified. Submission of additional information starts a new 60 day completeness review. Once an application is deemed complete, a technical decision is to be made within 150 days.


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  • NYSDEC
    Division of Materials Management
    Bureau of Pest Management
    625 Broadway
    Albany, NY 12233-7257
    518-402-8768
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