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Friday, April 9, 2010

Coragen now labeled for use in NC tobacco

The newest edition of the NC State Tobacco Connection Newsletter is now available. In this issue, I have 2 articles. The first discusses preplant insecticide uses and the second details the use a newly registered pesticide on tobacco, Coragen (DuPont).

Tobacco budworm (Heliothis virescens) is one of pests of tobacco for which Coragen is labeled. Photo: C.E. Sorenson.

Adapted from NC Tobacco Connection. 1(2): 9 April 2010
Coragen® labeled for use on NC tobacco
Coragen® insecticide (Rynaxypyr® or chlorantraniliprole), from DuPont, has recently been registered for use in tobacco in North Carolina. Coragen is the second Group 28 (ryanodine receptor inhibitor) insecticide to be registered for use in tobacco, with BeltTM (fluebendiamide, Bayer CropScience) being the first registered in the group. Both Coragen® and BeltTM act on insect muscles, resulting in feeding cessation and death.

Because Coragen®’s registration timing was unsure when the 2010 Flue Cured Tobacco Guide was produced, this article provides information on this new insecticide in comparison to our standards. You can find the supplemental label for Coragen® on tobacco: Two application methods are labeled, foliar and transplant water applications, and the rate range is 3.5 to 7.5 fl oz/acre. We have compared a range of foliar application rates of Coragen® to Tracer (spinosad, Dow AgroSciences) and BeltTM, and found them to be as effective to these materials. DuPont is recommending a rate of 5 fl oz/acre for foliar applications of Coragen®, and at this rate, this product should be at least as effective as Tracer or BeltTM¬ . We anticipate a greater degree of residual control with both BeltTM and Coragen® than we currently see with Tracer or Orthene (acephate), two of our standard foliar insecticides. We conducted longevity trials on these products in 2009, but we need at least one more year of data before we can draw conclusions. For the time being, I recommend good post treatment scouting with the anticipation that additional treatments may not be required. Good scouting is always of benefit, because in some years, no budworm treatments may be needed, and in 2009, several locations did not need to treat for hormworms because populations were late and smaller than normal. Scouting will also allow to maximize the potential savings of these products by reducing the total number of treatments if continued suppression is observed.

For growers interested in transplant water applications, DuPont is recommending 7 fl oz/acre in a minimum of 100 gallons per acre, or 2 fl oz/plant. Water volume is important, and I would not recommend using any less than 100 gal/acre for a transplant water application of this or other insecticides. Not only are smaller volumes much more difficult to calibrate, they may not adequately wet the root zone. We have included transplant water treatments of the active ingredient in Coragen® in research trials, but at a lower rate than 7 fl oz/acre. In these trials, we saw very good control with transplant applications, but again, the data are limited.

I have gotten several questions from agents and growers about transplant water tank mixes with fertilizer and other insecticides (such as Admire Pro or Platinum). I do not anticipate issues with combining Coragen® and Admire Pro or Platinum. We have combined these materials in research trials and have observed no adverse plant effects. We have not, however, combined Coragen® with a fertilizer tank mix, so although I also do not anticipate an issue with this application method, I cannot speak from firsthand experience. No matter how many research methods we come up with, growers always devise new ways to use a material, so we will be exploring some of these questions in 2010 at both grower and research station locations.

You can read the entire newsletter here: NC State Tobacco Connection Newsletter

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