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Disease Management

Timing Is Everything In Disease Management

Timeliness is a key component of disease management. Planting in the optimum-planting window has become an important part of reducing the likelihood of Tomato Spotted Wilt Virus. For foliar diseases, being on time with the initial fungicide application and then continuing at regular intervals offers the best possibility for control. For soilborne disease, growers are usually able to wait until about 60 days after planting to begin a control program. However, that time frame can be moved up if the weather is unusually warm and ample rainfall is received.

Leaf Spot
The effectiveness of your peanut leaf spot spray program should be periodically evaluated. If disease control is not adequate, adjustments can be made to prevent serious yield losses. If leaf spot control is fair-to-poor, shorten the interval between fungicide applications or increase the application rate to the highest amount on the label. Disease development will continue 14 days or more before any improvement in leaf spot control will be seen following this change in your spray program.

White Mold, Limb Rot And Web Blotch
The following are some general guidelines for control of these soilborne diseases.

• In fields with high risk for white mold, apply a soil fungicide no later than 60 days after planting. White mold must be prevented, and hot weather accelerates white mold growth.

• Soil fungicides must be washed into the soil to be effective but wait 24 hours before irrigating to also help control leaf spot.

• Do not apply more than a combined total of two strobilurin applications (Abound, Headline, Evito or Stratego) in any growing season to reduce risk of resistance.

• Spot check fields for leaf spot and white mold, particularly from 60 days after planting to harvest.

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