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Pioneer Premium Seed Treatment for Grain Sorghum

Agronomy Research Summary - 2011

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In 2012, Pioneer Premium Seed Treatment choices for grain sorghum will include a package of fungicide and insecticide providing unmatched protection and control against a broad spectrum of early season seed and soil-borne diseases, and protection from insects. The addition of Dynasty® (azoxystrobin) will enhance the level of activity against Fusarium, Rhizoctonia, and Pythium and provide additional suppression of sorghum downy mildew and further enhance the performance of Pioneer's industry leading germplasm.

Table 1. Pioneer sorghum seed treatment offering for 2012.
Table 1
*Cruiser 5FS is available as an option. Information in Table 1 is
provided by manufacturers.

Introducing Dynasty

Dynasty fungicide has been added to the Pioneer Premium Seed Treatment offering in grain sorghum, providing a broader range of protection against early season disease pathogens. Dynasty has been tested extensively by Pioneer Agronomy Sciences in on-farm and small-plot research trials and has demonstrated an exceptional level of performance complementary to Pioneer germplasm.

Sorghum downy mildew is a pathogen that can cause significant yield loss in portions of the western United States. The additional mode of action provided by Dynasty has shown an increased suppression of the pathogen over a standard fungicide package (Figure 1).

Figure 1
Figure 1. Yield advantage and consistency of Dynasty when
added to the standard fungicide treatment.

Figure 2
Figure 2. The addition of Dynasty outperformed a standard
fungicide treatment by 2.0 bu/acre at 21 locations where
sorghum downy mildew was present.*

*Some fungicides are applied to the seed at a higher rate in
sorghum downy mildew areas per label recommendations.

Value of Insect Control in a Seed Treatment

From 2009 to 2011, Pioneer conducted 181 on-farm seed treatment research experiments. The data collected from the research show that an insecticide treatment combined with a fungicide treatment (FST/IST) out-yields a fungicide only treatment (FST) by nearly 2 bushels per acre. Insect pressure can pose a serious threat to a young sorghum crop. Having early season insect control promotes seedling growth and vigor, increases the opportunity for optimum yields, and alleviates additional plant stress that a fungicide treatment alone cannot.

Figure 3
Figure 3. LEFT: Fungicide seed treatment (FST). RIGHT: Improved
stand and plant vigor with addition of insecticide seed treatment

Figure 4
Figure 4. Pioneer Agronomy Sciences extensively tests seed
treatment offerings across a wide range of environments, 181
locations, 2009 to 2011.

Figure 5
Figure 5. Yield comparison between FST and FST/IST; 181 locations
from 2009 to 2011.

Figure 6
Figure 6. Yield advantage and consistency of FST/IST compared
to FST only.


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