In grower fields and seed company trials in 2010, Poncho/Votivo-treated corn yielded 6 bu./acre more than seed treated with the 250 rate of Poncho 600 alone, according to Jennifer Riggs, product development manager, Bayer CropScience. The biological seed treatment was tested throughout the Corn Belt. In comparisons with Avicta Duo, Poncho/Votivo yielded 2 bu./acre, notes Riggs. Poncho 1250 and Votivo yielded 3 bu./acre more than the 1250 rate of Poncho 600, she adds.

In replicated trials conducted at eight locations in 2010, Activa 500 (0.5 mg a.i./seed) and Cruiser, and Avicta 1250 (1.25 mg a.i./seed) plus Cruiser yielded 4.9 and 3.4 bu./acre more than Poncho 500 plus Votivo and Poncho 1250 plus Votivo, respectively, says Palle Pedersen, technology manager, Syngenta Seedcare. The study was conducted by a third-party research firm on behalf of five independent seed companies, Pedersen adds.

Because visual symptoms of nematode damage are generally apparent, it may be cost-effective to use GPS technology to spot treat for the pest. Scott Monfort, Extension plant pathologist, University of Arkansas, says there is a relationship between nematode damage and soil type. He is using electrical soil conductivity mapping tools to detect soil texture variation.

Sandy soils have less electrical conductivity and tend to have a greater potential for nematode populations. Silt to clay soils have increasingly more conductivity. Measuring electrical conductivity can help growers construct management zones and then apply nematicide only in areas of the field that need it based on sample results from each management zone.

The SmartBox can be used to automatically apply Counter to corn nematode hot spots using a GPS interface to turn the system on and off. Currently, it is compatible with the Mid-Tech Legacy 6000 GPS controller. Amvac is working to broaden compatibility between the SmartBox and other GPS systems, Vaculin says.

Using GPS and variable-rate technology could make sense because nematodes are relatively immobile and are fairly predictable in a field, Iowa State’s Tylka says. “If you can determine the location of the hot spots, it would make sense to spot treat,” he says. 


NOTE: Force CS, Force 3G and Avicta Duo Corn are Restricted Use Pesticides and are for use by certified applicators only. Growers planting Avicta Duo treated seed are not required to be certified applicators. Avicta Complete Corn is a combination of separately registered products.