2012 Cercospora Resistance Maps

2012 Cercospora Resistance Maps

Cercospora Sensitivity/Resistance for Eminent EC-50

A very large majority of the townships are exhibiting either high or very high resistance to Eminent. Every application of Eminent should be applied with a tank mix partner of tin or mancozeb. The tank mix is strongly recommended to have full rates of both products. Never use less than 75% of full rates in the tank mix. Use the triazole products only once per season if at all possible. Cercospora resistance to one triazole means a level of resistance to other triazoles that could be used as well. This is known as cross resistance. The triazoles used in the ACSC growing area are Eminent, Proline and Inspire.

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Cercospora Sensitivity/Resistance for Eminent EC-50 with Highest Section Observation

The highest section observations indicating high or very high resistance levels are very common. Contact your agriculturist for information from samples taken in any specific section of the RRV.

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Townships with Highest Section Observation Resistant to Eminent EC-50

The highest section observations indicating high or very high resistance levels are very common. Contact your agriculturist for information from samples taken in any specific section of the RRV.

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% of Isolates Highly Resistant to Eminent EC-50

This map clearly indicates that over half of the townships have 50% or more of the field samples that tested highly resistant to Eminent.

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Cercospora Sensitivity/Resistance for Headline

Resistance to Headline is documented in map 6. Only two townships had a highest observation with severe resistance. Five townships had a highest observation indicating moderate resistance to Headline. Four townships had a highest observation in the slight resistance category. Only 11 of over 700 samples analyzed in the ACSC growing area exhibited any degree of resistance to Headline. Fields in the same section or adjacent sections where resistance was observed should have Headline applied with a tank mix partner in 2013. It is critical to do everything possible to eliminate Headline resistance thus preserving Headline efficacy for Cercospora control, plant health benefits and frost protection.

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Cercospora Sensitivity/Resistance for Headline with Highest Section Observation

Resistance to Headline is documented in map 6. Only two townships had a highest observation with severe resistance. Five townships had a highest observation indicating moderate resistance to Headline. Four townships had a highest observation in the slight resistance category. Only 11 of over 700 samples analyzed in the ACSC growing area exhibited any degree of resistance to Headline. Fields in the same section or adjacent sections where resistance was observed should have Headline applied with a tank mix partner in 2013. It is critical to do everything possible to eliminate Headline resistance thus preserving Headline efficacy for Cercospora control, plant health benefits and frost protection.

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Cercospora Tolerance to TPTH at 1 PPM

Twenty townships had samples determined to have resistance to TPTH at the 1 ppm level or greater. Tin fungicides should only be used once per season in these townships if at all possible. Tank mixing the tin applications is a recommended practice to follow.

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Cercospora Sensitivity/Resistance for Inspire EC-50

Cercospora resistance to Inspire is gradually increasing each year. Only about 10% of all townships where ACSC raises beets are now free of resistance to Inspire. None of the township averages for Inspire are in the very high resistance category. However 30 townships now have average resistance levels in the high category. Always tank mix Inspire with a tin or mancozeb product in 2013 for best results. Full rates of each product in the tank mix are recommended. Contact your agriculturist for exact locations of sections with high or very high resistance in your growing area, view map with highest section observation.

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