New products boost citrus psyllid resistance management options

02/18/2013 04:48:00 PM
Renee Stern

Growers can look forward to new options for controlling Asian citrus psyllid in the next few years as pesticides in the development pipeline near the release stages.

At least two companies anticipate bringing foliar and soil drench products labeled for use in Florida citrus to market in the first half of 2013, pending registration approval by the Environmental Protection Agency and state regulators.

Asian citrus psyllid vectors the potentially devastating huanglongbing disease, also known as HLB and citrus greening.

Effective on psyllids and other insects

First out of the gate may be Indianapolis-based Dow AgroSciences' sulfoxaflor, to be marketed as Closer for psyllid control in citrus. Toni McEwan, Closer product manager, estimates EPA approval should come in 2013's first quarter.

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A foliar-applied product, Closer is effective on contact and after ingestion by the pest, McEwan says. The Insecticide Resistance Action Committee places sulfoxaflor in the newly created Group 4C mode of action. The sole member of this subgroup, it has a unique interaction with the insects' nicotinic acetylcholine receptor.

Sulfoxaflor is highly systemic in the plant, moving upward into new growth and providing a residual effect similar to that found with Delegate, another Dow insecticide. Exactly how long the product remains active in the plant varies with coverage and weather conditions, she says.

Spring applications, around bloom, are ideal, taking advantage of the product's minimal impact on bees and other beneficial insects, McEwan says. Closer will pair up well as a rotational partner with Delegate.

The company also plans to label Closer for use against citrus mealy bugs, brown citrus aphids and Florida red scale.

Foliar and drench formulations

Meanwhile, Wilmington, Del.-based DuPont Crop Protection plans to add two new products incorporating cyazypyr by midyear to its Florida citrus lineup, says Joe Mares, U.S. product launch manager for cyazypyr brands. Cyazypyr, an active ingredient in the anthranilic diamide class, falls into IRAC's Group 28 mode of action and is a ryanodine receptor modulator.

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Stripped Mealybug    
March, 10, 2013 at 12:02 AM

Did you know the stripped mealybug also transmits HLB according to new reports from the Univ of Fla. Good luck. Resistant tree now or it will all come to an end quickly.

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