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Posted 15 June 2009. PMN Crop News.

Unique Chemistry of RADIANT SC Insecticide Fits IRM Programs

Mode of action offers broad-spectrum control of vegetable pests

Dow AgroSciences, LLC.

Indianapolis (June 2, 2009)--Proper Insecticide Resistance Management (IRM) is vital to control damaging pests and preserve the effectiveness of insecticides in vegetable crops. Growers seeking insecticide options for IRM should consider RADIANT™ SC insecticide. Its novel chemistry makes RADIANT a valuable partner in any IRM program.


The active ingredient in RADIANT, spinetoram, is classified as a Group 5 insecticide by the Insecticide Resistance Action Committee (IRAC). The unique chemistry of RADIANT makes it an excellent option in a rotation as it is the only Group 5 insecticide used in conventional vegetable crops.

“RADIANT features a unique mode of action that makes it ideal for an IRM program,” says Dr. Tom Kuhar, associate professor of entomology at Virginia Tech University. “RADIANT is a model insecticide to use in a rotation.”

The goal of successful IRM is to prevent or delay the evolution of resistance to insecticides. Resistance occurs when a pest population adapts to a specific insecticide, usually due to overuse or misuse of the compound. The key to managing resistance is rotating products with different modes of action and limiting the number of applications of any one class of chemistry.

Other insecticides labeled for vegetables share the same mode of action with other products. For example, Assail, Actara and Provado all belong to the Group 4A class of insecticides; Coragen and Synapse are Group 28 insecticides; and Movento and Oberon are both Group 23 insecticides.

“The innovative chemistry of RADIANT makes it an excellent option in a rotation with other products on the market,” says Tony Weiss, field scientist for Dow AgroSciences. “When used properly, RADIANT offers growers another tool for insecticide spray programs.”

RADIANT™ SC insecticide offers vegetable growers a fast knockdown of a broad spectrum of pests, including loopers, armyworms, thrips, leafminers and diamondback moth. It controls multiple insect growth stages and provides residual control while maintaining populations of most beneficial insects through a targeted Integrated Pest Management (IPM) approach.

“RADIANT is active against all vegetable pests that have shown to develop resistance,” Kuhar says. “It is an excellent control material for thrips and caterpillar pests, making it ideal not only in an IRM program but for IPM as well.”

Weiss recommends not making more than two consecutive applications of Group 5 insecticides. If more applications are required, rotate to another class of effective insecticide for at least one application. INTREPID® 2F insecticide, which contains the active ingredient methoxyfenozide, makes an ideal rotational partner with RADIANT when controlling caterpillar pests. As a Group 18 insecticide, INTREPID 2F offers the different mode of action necessary to avoid resistance.

“INTREPID 2F is the perfect fit in an insecticide rotation with RADIANT,” Weiss says. “Not only is there no other material like it in the vegetable marketplace, but INTREPID 2F also is the premier worm control product.”

Weiss reminds growers to always read and follow label directions and to consult the label before purchase to determine the class of insecticide.

®™INTREPID and RADIANT are trademarks of Dow AgroSciences LLC.

State restrictions apply on the sale and use of INTREPID 2F. Consult the label prior to purchase or use for full details.

Always read and follow label directions.

Brett Garrard