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Target Spot hits tobacco float beds

By Nick Roy
Adair County Extension Agent for Agriculture and Natural Resources

Target Spot has become active in tobacco float beds in recent weeks. Target Spot can lead to a yield loss greater than 50% and a decrease in leaf quality if left untreated.



Treating tobacco for Target Spot before transplanting is the best option. Target Spot can easily be identified by foliar symptoms.

Plants infected with Target Spot may show one of two or both symptoms. Symptoms may occur in the form of bullseye spots located on the leaf in various sizes.

Other symptoms include many small black dots or pinpoint holes in the leaf. The fungicide Quadris has received an active 24c (special local need) label that permits the use of Quadris on tobacco in greenhouses and float beds, aimed for Target Spot control.

The label permits one application on the plants before they go to the field, and the rate is 0.14 fl oz / 1000 sq. ft. of bed. This is the equivalent of 4 ml (about a teaspoon) of Quadris per gallon of spray mix. Since we have only one application permitted by the label, the best strategy would be to apply the Quadris at around 4-5 weeks after seeding (around the 1st or second clipping) as a preventive for target spot, or when disease first occurs.

Any further treatments will require the use of Dithane.

For more information on Target Spot in tobacco float beds, contact the Adair County Cooperative Extension Service at (270) 384-2317, or visit the Extension Office at 409 Fairground ST, Columbia, KY. -Nick Roy


This story was posted on 2011-05-13 18:46:30
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Target spot in tobacco float beds



2011-05-16 - 409 Fairground ST, Columbia, KY - Photo from Nick Roy, Adair Co. Extension Service.
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