Cotton Bacterial Blight Update: July 18, 2014 (UPDATED 7/28/2014)

Tom Allen, Extension Plant Pathologist
By Tom Allen, Extension Plant Pathologist and Darrin Dodds, Extension Cotton Specialist July 18, 2014 16:06

Cotton Bacterial Blight Update: July 18, 2014 (UPDATED 7/28/2014)

photoOver the past seven to 10 days numerous additional reports of bacterial blight have been made from throughout the state.  Several additional varieties, have been observed to contain bacterial blight infected leaves and in one situation, bolls.  Presently, seven cotton varieties representing four different seed companies have been reported.

 

Seed company Variety
Cropland 3787 B2RF
Deltapine 0912 B2RF
1028 B2RF
1034 B2RF
1321 B2RF
Phytogen 499 WRF
Stoneville 4946 GLB2

Additional bacterial blight has been observed this year in Louisiana for the first time in many years (see: http://louisianacrops.com/2014/07/18/bacterial-blight-angular-leaf-spot-observed-in-louisiana-cotton-fields/ ).  In MS, bacterial blight has been reported from 16 counties throughout the state.

2014 Bacterial blight distribution

Bacterial blight is predominantly a seedborne disease, except in rare situations where the organism overwinters on cotton residue remaining in the field.  Rain, overhead irrigation, wind, as well as equipment used in fields when dew is present can move the bacterium to fields of susceptible cotton.  Management practices should not be altered in situations where the disease is observed in susceptible cotton varieties.  Keep in mind, that the majority of the cotton varieties planted in MS are susceptible to the bacterium.

For more information regarding scouting practices, appearance of the disease, and the specific response of some cotton varieties please refer to:

http://www.mississippi-crops.com/2014/07/08/scouting-cotton-for-bacterial-blight-in-2014/

 

 

 

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Tom Allen, Extension Plant Pathologist
By Tom Allen, Extension Plant Pathologist and Darrin Dodds, Extension Cotton Specialist July 18, 2014 16:06
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