REI for Common Vineyard Insecticides: Quick Reference

By VitiScribe Editorial·April 24, 2025·Updated June 1, 2025

Organophosphate insecticides have the longest REI of common vineyard products at 24-48 hours -- a span that can substantially affect your labor scheduling during intensive spray periods. VitiScribe posts REI to block records automatically so you're not maintaining paper signs or manually tracking which blocks are closed and when. But knowing REI values for products you commonly use is essential for any vineyard manager who coordinates spray crews with labor operations.

This reference covers REI values and WPS posting requirements for commonly used vineyard insecticides. REI values are established on federal product labels under the Worker Protection Standard (WPS). Always confirm REI on the current product label -- labels can be amended between seasons.

TL;DR

Diamide insecticides (IRAC Group 28 -- Altacor, Coragen, Belt) all carry 4-hour REIs, the shortest among commonly used vineyard insecticides, making them the most operationally convenient when field labor follows soon after application
Pyrethroid insecticides (IRAC Group 3 -- Warrior II, Asana XL) carry 24-hour REIs and high bee toxicity -- both constraints make scheduling around bloom and field operations more restrictive than diamide alternatives
For tank mixes, the longest REI among all products in the mix is the controlling REI -- a 4-hour diamide mixed with a 24-hour organophosphate creates a 24-hour restriction for the entire treated block
Admire Pro (imidacloprid) at 12-hour REI for soil drench applications is substantially shorter than its 21-day PHI -- the PHI is the schedule-limiting factor for Admire Pro, not the REI
WPS posting requires warning signs at all field entry points before application begins, not just a central posting -- a vineyard block with multiple road, path, and gate entry points requires a sign at each
OMRI-listed biologicals (Entrust SC at 4-hour REI, Pyganic EC at 12-hour REI, Kaolin at 4-hour REI) have REI requirements that are not optional for organic operations -- OMRI listing does not exempt products from WPS posting and REI compliance

Understanding REI and WPS Requirements

The re-entry interval (REI) is the minimum time between a pesticide application and when workers can enter the treated area without required personal protective equipment (PPE). REIs are established by the EPA as part of the Worker Protection Standard based on toxicological data.

WPS posting requirements:

Treated area warning signs must be posted at all entry points to the treated area
Central posting location (field safety bulletin) must display current pesticide information during REI
Signs must remain posted until the REI expires
Verbal notification is required before workers enter during REI for early-entry exceptions

Early-entry provisions: Workers can enter during REI for specific early-entry activities (irrigation management, soil sampling, some scouting activities) with specific PPE requirements listed on the label. Early entry does not eliminate the WPS posting requirement.

For the complete REI tracking and WPS compliance framework, see the re-entry interval tracking guide.

REI by Product Category

Spinosyn Insecticides (IRAC Group 5)

Delegate WG (spinetoram): 4-hour REI. One of the shorter REIs among effective vineyard insecticides. The combination of 4-hour REI and 7-day PHI makes Delegate practical for operations that need to return field workers relatively quickly after application.

Entrust SC (spinosad): 4-hour REI. OMRI-listed for organic programs. Same REI as Delegate.

Diamide Insecticides (IRAC Group 28)

Altacor WG (chlorantraniliprole): 4-hour REI. Short REI combined with excellent residual activity makes Altacor practical for use in blocks with ongoing field operations. 5-day PHI.

Coragen (chlorantraniliprole liquid): 4-hour REI.

Belt SC (flubendiamide): 4-hour REI.

Neonicotinoid Insecticides (IRAC Group 4A)

Admire Pro (imidacloprid soil application): 12-hour REI for soil applications. Canopy spray applications may have different REI -- check label for specific use type. The 12-hour REI for soil drench applications is shorter than many organophosphates, though the 21-day PHI limits timing flexibility.

Venom 70 SG (dinotefuran): 12-hour REI.

Assail 70WP (acetamiprid): 12-hour REI.

Spirotetramat (IRAC Group 23)

Movento 240SC (spirotetramat): 24-hour REI. The longer REI relative to diamides and spinosyns is an operational consideration for blocks with active labor. Plan applications when you can observe the 24-hour field closure.

Organophosphate Insecticides (IRAC Group 1)

Imidan 70-W (phosmet): 24-hour REI. Standard organophosphate REI. One of the more commonly used vineyard organophosphates. 7-day PHI.

Lorsban Advanced (chlorpyrifos): 24-hour REI minimum. Some uses may have longer REI requirements. Check current California registration status -- notable restrictions apply.

Pyrethroid Insecticides (IRAC Group 3)

Warrior II (lambda-cyhalothrin): 24-hour REI. High bee toxicity -- avoid during bloom. 21-day PHI limits late-season use substantially.

Brigade 2EC (bifenthrin): 12-hour REI for most uses. Check label for specific use REI.

Asana XL (esfenvalerate): 24-hour REI.

Insect Growth Regulators (IRAC Group 7C)

Esteem WP (pyriproxyfen): 12-hour REI.

Intrepid 2F (methoxyfenozide, IRAC Group 15): 4-hour REI. Among the shortest REIs of caterpillar management materials. 7-day PHI.

Biological and Organic Options

Pyganic EC (pyrethrin): 12-hour REI. OMRI-listed.

M-Pede (insecticidal soap): 12-hour REI. OMRI-listed.

Kaolin clay (Surround WP): 4-hour REI. OMRI-listed. Physical mode of action.

REI Reference Summary Table

|---------|-----------------|------------|-----|

| Kaolin clay | -- | -- | 4 hours |

Note: REI values listed are from current federal labels. Always confirm on the specific product label you are using. State labels or supplemental restrictions may impose longer REI requirements.

WPS Posting Logistics for Vineyard Operations

Posting requirements under WPS are specific about what must be displayed and where.

What must be posted:

Warning sign at each field entry point (including roads, paths, and gates entering the treated area)
Central posting location (field safety bulletin board or posted area) must include: product name, EPA registration number, REI expiration date and time, active ingredients, location of treated areas, and any other required information from the safety data sheet

Duration: Signs must remain posted until the REI has expired. If you apply on Monday at 8 AM with a 24-hour REI, signs must remain until Tuesday at 8 AM minimum.

Electronic REI tracking in VitiScribe: VitiScribe's block dashboard shows active REI status for each block. When you log an application, the system calculates the REI expiration date and time and displays it for the block until the interval has passed. This gives you a digital tracking tool alongside physical sign posting requirements -- it doesn't replace the physical signs, but it gives your team a quick reference for which blocks are currently under REI restriction.

See how VitiScribe handles WPS and REI compliance documentation.

Frequently Asked Questions

What is the REI for Delegate insecticide in vineyards?

Delegate WG (spinetoram, IRAC Group 5) has a 4-hour re-entry interval in grapes. This is one of the shorter REIs among effective vineyard insecticides, which makes it operationally convenient when you need to return workers to a treated block relatively quickly. Post WPS warning signs at all field entry points before application and remove or cover them after the 4-hour REI has expired. Confirm the REI on your specific product label before applying -- label updates can change REI values.

What vineyard insecticides have the longest REI?

Organophosphate insecticides (IRAC Group 1) consistently have the longest REIs among commonly used vineyard insecticides at 24 hours. Products in this category include phosmet (Imidan 70-W) at 24 hours and chlorpyrifos (Lorsban Advanced) at 24 hours minimum. Pyrethroids (IRAC Group 3) including lambda-cyhalothrin (Warrior II) and spirotetramat (Movento) also carry 24-hour REI values. When scheduling applications that will require field labor within 12-24 hours -- irrigation checks, scouting, harvest crew pre-work -- choose products with shorter REIs (4-12 hours) when agronomically appropriate.

What WPS posting is required for REI in vineyards?

Under the Worker Protection Standard, you must post warning signs at all entry points to the treated area before the application begins. The signs must state that the area is treated with pesticides and entry is restricted until the REI ends. Your central posting location (field safety bulletin) must display the pesticide product name, EPA registration number, REI expiration time, active ingredients, and location of treated areas. Signs must remain posted until the REI has expired -- removing signs before REI expiration is a WPS violation. Workers entering during REI for permitted early-entry activities must wear the PPE specified on the label for early-entry work.

How should a vineyard manager choose between Altacor (4-hour REI) and Movento (24-hour REI) for mealybug management when field labor is scheduled the following morning?

If field labor is scheduled to begin at 7 AM the following morning and the application would be made at 4 PM today, Movento's 24-hour REI would not expire until 4 PM the following day -- 9 hours after field labor needs to begin. Altacor's 4-hour REI would expire at 8 PM the same day, well before field labor begins. From a pure REI-scheduling standpoint, Altacor is appropriate. The agronomic considerations differ: Movento (spirotetramat, Group 23) is the preferred mealybug material in many programs due to its systemic, two-way movement and efficacy against young crawlers and adults; Altacor (Group 28) is primarily a caterpillar management material with different spectrum activity. If Movento is the agronomically required product, the practical solution is to delay the application until after field labor completes, so the 24-hour REI window falls when the block is not scheduled for entry.

For a California organic vineyard using Entrust SC, what WPS posting and REI documentation is required to demonstrate compliance to a CCOF certification inspector?

CCOF certification inspection of organic inputs focuses on OMRI listing documentation, but CCOF also requires that organic operations maintain compliance with all applicable regulations -- including WPS. For an Entrust SC (spinosad, OMRI-listed, 4-hour REI) application, the compliance documentation should include: the application record with product, EPA registration number, rate, application end time, block location and treated acreage, and the 4-hour REI notation; evidence that WPS posting occurred (photograph of posted signs, printout of the VitiScribe REI posting notice, or written record of posting); worker notification records; and the OMRI listing documentation confirming Entrust SC's OMRI status for the certification year. The REI compliance record and the organic input record are both required -- neither substitutes for the other.

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Sources

EPA Worker Protection Standard (WPS)
California Department of Pesticide Regulation (CDPR)
IRAC (Insecticide Resistance Action Committee)
UC Cooperative Extension Viticulture
American Vineyard Foundation

Get Started with VitiScribe

REI tracking across a vineyard operation requires knowing which product is the controlling REI in every tank mix, calculating expiration from application end time (not start time), and maintaining documented notification records that prove workers were informed -- not just paper signs that may or may not have been read. VitiScribe identifies the controlling REI in multi-product applications, calculates expiration from end time, pushes notifications to crew phones with timestamps, and generates printable WPS posting notices. Try VitiScribe free and track your next insecticide application's REI status for every affected block today.