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2017 Annual Bluegrass Weevil Optimum Control Strategy

Acelepryn
Ference
Provaunt
Scimitar GC

With the documentation of pyrethroid resistance in certain ABW populations – primarily in southern New England – this program incorporates a range of insecticides with different MOAs. The program anticipates the worst-case scenario of a prolonged period of egg laying by overwintered ABW adults and recognizes that, under some circumstances, even high levels of control of first generation larvae will not completely prevent damage by summer generations of ABW.

Annual Bluegrass Weevil Optimum Control Strategy Summary (for First Generation ABW Control)

 
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Insecticide
Treatment
Program
1st Generation

Stage 1 - Over wintered Adults

Stage 2 - Early Instar (inside of stem)

Stage 3 - Late Instar (outside of stem)

Scimitar® GC 10 fl oz/A or
Chlorpyrifos 1 lb ai/A

Acelepryn® 12 fl oz/A

Ference® 12 fl oz/A

Timing

Application is based on degree days and ABW activity. Some areas may require two applications spaced 14 days apart.

Early to mid-April
Forsythia half green half gold

Application should be applied prior to egg hatch to ensure that Acelepryn is in the transition stream prior to larvae feeding.

Late April to early May
Dogwood full bloom

Application should be applied when the third stage larvae exit the stem to feed on the crown and surface roots

Mid-May to early June
Rhododendron catawbiensis full bloom

*Application timing varies based on geography.

Annual Bluegrass Weevil Optimum Control Strategy Summary (for Second Generation ABW Control)

 
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Insecticide
Treatment
Program
2nd Larval Generation     3rd Larval Generation
(if needed)

Stage 4 - Adults

Stage 5 - Adults and Late Instar

Stage 6 - Asynchronous larvae

 Stage 7

Scimitar® GC 10 fl oz/A or
Chlorpyrifos 1 lb ai/A

Provaunt® 12 oz/A*

Ference® 12 fl oz/A

Provaunt 12 oz/A

Timing

Application is based on the presence of adults.

Mid- to late June

Application should be applied about 7 to 14 days after adulticide.

Late June to early July

Application should be applied about 14 to 21 days after Provaunt.

Application should be applied about 21 to 28 days after Ference.

Late August to early September

*Application timing varies based on geography.

Please note: If your course is in Nassau, Suffolk, Kings and Queens counties of New York state, please click here for your Stage 2, Stage 3, and Stage 6 instructions as Acelepryn and Ference are not registered for sale or use in these counties.

First Generation Control

The treatment schedule below is for the first generation of ABW activity on golf courses. Subsequent ABW generation treatment recommendations are based on first generation tracking by WeevilTrak researchers.

FIRST APPLICATION (Stage 1): The first application uses Scimitar GC as an adulticide at a recommended rate of 10 fl oz/A in late March to early May. Timing of this application will be based on degree days and refined according to observations on plant phenology and ABW activity. Be sure to carefully monitor for adults and check WeevilTrak.com for proper timing in your area.

The adulticide application accomplishes three important tasks:

  1. Reduces overall ABW pressure by killing adults on contact as they move from overwintering sites into areas of highly managed annual bluegrass. Roughs that are adjacent to ABW overwintering sites can also be treated, so they act as buffer zones.
  2. Prevents early egg laying by overwintered ABW females.
  3. Allows Acelepryn to be applied slightly later in the season so you have insecticide protection for roughly two months.
  4. For areas with resistance to pyrethroids, an application of chlorpyrifos at 1 lb ai/A is a viable substitute for Scimitar GC.

SECOND APPLICATION (Stage 2): Although Acelepryn is highly active against ABW larvae, timing is critical because effective control depends on the systemic uptake of Acelepryn by the plant. It is important to have Acelepryn moving in the transpiration stream of the plant when the ABW larvae hatch and begin to chew their way into the stem in late April to mid-May.

Evidence shows Acelepryn will provide high levels of control of ABW when applied three weeks before hatch. The timing of this application will be made roughly two to three weeks after the first application of Scimitar GC and will be based on degree day monitoring (check WeevilTrak.com for proper timing in your area).

Applying Acelepryn at 12 fl oz/A is critical and provides:

  1. About three weeks of ABW larval control.
  2. Season-long control of white grubs.
  3. Season-long control of caterpillars.

THIRD APPLICATION (Stage 3): The third treatment needed to target first generation ABW larvae is an application of Ference during mid-May to early June to control all instar larvae (1st-5th). This application is critical because June is often when the first period of notably hot weather occurs in the Northeast, which makes annual bluegrass exceptionally vulnerable to damage. Ference is highly effective against asynchronous ABW populations, making it the best choice to round off first generation applications.

Applying Ference at 12 fl oz/A is important to:

  1. Provide systemic control of ABW at all larval stages (1st-5th instar).
  2. Control asynchronous larval populations that may be present.

Summer Generation Control

First generation ABW populations may reach more than 300 larvae per square foot of turfgrass if left uncontrolled. Under such extreme population pressure, even programs that provide exceptionally high levels of control will allow a certain number of ABW to survive and produce second and third generations throughout the summer.

FOURTH APPLICATION (Stage 4): The first generation adults that generally appear in mid- to late June are prime targets for another adulticide application using Scimitar GC, or a chlorpyrifos product. As the adults reproduce, ABW populations usually become asynchronous, meaning that all life stages are present at the same time and there often is no single dominant stage.

FIFTH APPLICATION (Stage 5): For further control of second generation adults and late instar, the Optimum Control Strategy recommends the first application of Provaunt.

Applying Provaunt at 12 oz/A is important to:

  1. Target early third instar larvae as they emerge from the stem and move to feed on the crown of the plant.
  2. Provide two to three weeks of residual control, which will strengthen the management program for the second generation larvae.
  3. It is recommended to water-in Provaunt applications with .05 - .10 inches of water immediately after application.

SIXTH APPLICATION (Stage 6): Late July through early August is prime time for another insecticide application to reinforce control of instar larvae ABW. Ference is recommended for this application because it is highly effective against asynchronous larval populations that may be present in the first, second and/or third generation from July to September.

An application of Ference at the rate of 12 fl oz/A in this time period should carry most courses through to the end of the year.

SEVENTH APPLICATION (Stage 7 if needed): If a third generation of ABW larvae becomes present and increases the asynchronous summer population in late August and early September, Provaunt can be applied at a rate of 12 oz/A 21 to 28 days after the Ference application to extend control of the asynchronous larvae population.

Download PDF Version of the Optimum Control Strategy ›

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Recommendations are based on observatons from field researchers and may differ based on geography. Always apply product based on your local conditions.

©2017  Syngenta. Important: Always read and follow label instructions. Some products may not be registered for sale or use in all states or counties. Please check with your local extension service to ensure registration and proper use. Ference™ is a Restricted Use Pesticide in the State of New York. Scimitar GC is a Restricted Use Pesticide. Acelepryn®, Ference™, Provaunt® and Scimitar® are trademarks of a Syngenta Group Company.

(This site has attempted to provide the most accurate, timely information possible on this site. The descriptions, pictures and other representations of products and treatment recommendations on this micro-site may contain inaccuracies and errors. The site owner does not make any warranty or representation with respect to the accuracy or completeness of any such information, and all users of this site should consult their own specialists regarding application decisions and timing.)