facebook_pixel

Whitefly Tune-Up

Cotton growers are becoming more creative in treating for whitefly, now that they have a much broader selection of controls.

In California, some growers are getting by with a single treatment by combining an insect growth regulator (IGR) with endosulfan, or other adulticide. But in Arizona, where whitefly pressure is so high, that’s usually not possible, so growers are using an IGR as their first and second lines of defense.

Admire and the other neonicotinoids are as effective as always, but are usually reserved for aphids and lygus earlier in the season in California, or for neighboring crops in both California and Arizona. And Oberon is now available as a selective first line of defense, especially if mites are present.

Matthew Phillips, an independent Professional Crop Advisor (PCA) in Yuma, AZ, uses a systematic approach for scouting, saying, “We started watching our fields in mid-April, and can start spraying as early as mid-June. We watch the nymph population. If it’s building slowly, we will treat with an IGR – usually Courier, but we also use Knack occasionally. If we have really high adult populations coming in fast – say, tripling in a week’s time – we will throw some endosulfan in the tank.

“The endosulfan takes care of the adults and the IGR gives us a good 30-40 days of control, and can usually carry us through the season,” he continues. “Occasionally, we will have to make a second spray with an IGR, and we will rotate to a different IGR for that late spray.”

He will consider Intruder (a neonicotinoid), but to avoid potential resistance problems, he prefers not to use it in cotton because melons, that can be in nearby fields, are already treated with Admire. He will add Oberon if mites are present, or simply to rotate to a different IGR.

California Innovations

Mike Mullion, a grower and PCA in Blythe, CA, takes a similar approach, except he usually uses Knack in his first IGR treatment and Courier in his second. “We’re in the desert, right on the Arizona/California border,” he says. “With the crop rotations we have, our cotton is surrounded by alfalfa and melons, so we get some pretty high whitefly populations. I like Knack in my first application because it’s translaminar (systemic).” But, he says, later in the season when the leaf hardens and won’t absorb Knack, he switches to Courier.

Mullion says mites occasionally invade his fields from nearby alfalfa fields, “so I use Oberon on maybe 20% of my acres.”

Probably the most innovative idea is coming from California’s San Joaquin Valley, where lighter whitefly pressure is allowing growers to get by with a single treatment of Courier and an adulticide. “I wait until I have 5-7 adults on the fifth leaf; there’s usually 1-5 nymphs per leaf at that time, too,” says Matt Chase, a PCA with Helena Chemical in Hanford. “Then, I come in with Courier and endosulfan — either Thionex or Thiodan. Or if I can’t use endosulfan because of restrictions, I’ll use a combination of a pyrethroid, like Mustang or Warrior, along with an organophosphate like Lorsban. I sometimes use Assail as my adulticide. It isn’t a true knockdown, but it does a pretty good job, plus it picks up aphids,” says Chase.

The adulticide knocks out any adults in the field, explains Chase, while the IGR stops nymphs from developing into adults, giving him a month or more of residual. Courier and Knack are the two IGRs registered for cotton, but Knack needs to be applied earlier in the season to be effective, he says. “That’s what I like about Courier – you can apply it early or late,” says Chase.

Leave a Reply

Insect Control Stories
Insect Control

Early Whitefly Detection Key to Successful Control

July 26, 2017

Whitefly populations are unusually high in Georgia cotton fields this season, making early detection and management essential.

Insect Control

Results of 2016 Insecticide Efficacy Survey Now Online

April 26, 2017

Results of the 2016 Insecticide Efficacy Survey for cotton, corn and soybeans are now available online.

Insect Control

Tennessee Receives Section 18 for Transform in Cotton

April 21, 2017

The EPA has again approved the Section 18 Emergency Exemption for use of Transform WG in Tennessee to control tarnished plant bugs in cotton.

thrips
Insect Control

New Online Tool Aids in Thrips Management Decisions

April 11, 2017

A new online tool is now available to help cotton growers better predict thrips infestations and determine options for treatment.

Insect Control

Plant Bugs Off to Warm Weather Start?

April 4, 2017

Warmer than usual winter weather could mean an earlier start for plant bugs in 2017.

Insect Control

Transform Receives Exemption for Plant Bug Control in Arkansas Cotton

March 30, 2017

Arkansas has been granted a Section 18 exemption for 2017 for use of Transform WG insecticide for management of tarnished plant bugs in cotton.

Insect Control

Can Cover Crops Hamper Pest Management?

March 1, 2017

Growers will likely need to adjust their pest management practices to avoid crop losses when cover crops are used.

Around The Gin
Product News

Protect Cotton Potential from Weeds, Worms and Diseases

July 12, 2017

Southeast cotton producers say latest technologies from PhytoGen help protect yield and quality.

Product News

Monsanto “Troubled” by Arkansas Dicamba Decision

June 26, 2017

Monsanto has weighed in on the Arkansas Plant Board’s proposed ban of dicamba use in the state.

Product News

Drexel Adds Two Regional Sales Reps

June 16, 2017

Kyle Herring and David Davis have joined Drexel Chemical Company as regional sales representatives.

Product News

Dow AgroSciences Launching Enlist Corn in 2018

June 16, 2017

Following the launch of Enlist cotton, Dow AgroSciences will make Enlist corn commercially available for 2018 after receiving Chinese import approvals.

Product News

Transform Earns Section 18 Exemptions for Cotton, Sorghum

May 4, 2017

Transform WG insecticide has received Section 18 emergency use exemptions for use in cotton and sorghum in select states for the 2017 production season.

Product News

EPA Approves Monsanto’s NemaStrike Technology

May 2, 2017

The EPA has issued registration for tioxazafen, a new nematicide from Monsanto that will be branded as NemaStrike Technology for nematode control and yield protection in cotton, corn and soybeans.

Product News

Indigo Partners Launched for In-Field Technology Testing

April 25, 2017

Indigo is launching Indigo Partners, a collaboration of 25 U.S. growers and agronomic experts to test agricultural technologies – including Indigo’s microbial seed treatments – during 2017.

Product News

UPI Adds New Herbicide Products

April 14, 2017

UPI has added two new herbicides to its portfolio of high quality crop protection products for the U.S.

Latest News
Insect Control

Early Whitefly Detection Key to Successful Control

July 26, 2017

Whitefly populations are unusually high in Georgia cotton fields this season, making early detection and management essential.

Insect Control

How Aggressive Should Bollworm Treatments Be?

July 18, 2017

Mississippi State entomologists offer bollworm treatment suggestions based on what has been seen in fields to date and the Bt technologies used.

Insect Control

Bollworms Attack Some Texas Cotton, Sorghum

July 14, 2017

Bollworm damage to cotton and grain sorghum is ramping up across parts of Texas.

Insect Control

Results of 2016 Insecticide Efficacy Survey Now Online

April 26, 2017

Results of the 2016 Insecticide Efficacy Survey for cotton, corn and soybeans are now available online.

Insect Control

Tennessee Receives Section 18 for Transform in Cotton

April 21, 2017

The EPA has again approved the Section 18 Emergency Exemption for use of Transform WG in Tennessee to control tarnished plant bugs in cotton.

Insect Control

New Online Tool Aids in Thrips Management Decisions

April 11, 2017

A new online tool is now available to help cotton growers better predict thrips infestations and determine options for treatment.

Insect Control

Plant Bugs Off to Warm Weather Start?

April 4, 2017

Warmer than usual winter weather could mean an earlier start for plant bugs in 2017.

Insect Control

Transform Receives Exemption for Plant Bug Control in Arkansas Cotton

March 30, 2017

Arkansas has been granted a Section 18 exemption for 2017 for use of Transform WG insecticide for management of tarnished plant bugs in cotton.

Insect Control

Can Cover Crops Hamper Pest Management?

March 1, 2017

Growers will likely need to adjust their pest management practices to avoid crop losses when cover crops are used.

Insect Control

Keep Spider Mites in Mind When Planning Burndown

February 9, 2017

Spider mite management should be a consideration in every grower’s preplant burndown plans.

Insect Control

Insect Control Guide App Available from MS State

February 3, 2017

An app of the Mississippi State University 2017 Insect Control Guide is now available through the iTunes App Store, with an Android version coming soon.

Insect Control

Cotton Seed Treatment Choices Will Be More Important In 2017

January 26, 2017

Early season thrips control will be more important than ever in 2017 due to the introduction and anticipated use of dicamba-tolerant cotton varieties, according to Mississippi State University cotton specialists.

Insect Control

Insect Traits Evolving for Ongoing Bug Battles

September 8, 2016

As Mother Nature creates new challenges, the industry’s insect technologies must adapt.

Insect Control

When to Terminate Insecticide Applications in Cotton

August 24, 2016

The decision to terminate insect controls in cotton can be challenging in some fields, but a few basic considerations will assist in that decision.

Insect Control

Finalizing Cotton Insect Control

August 2, 2016

As many cotton fields reach or approach cutout, it’s time for growers to start making final insect management decisions.