Arkansas Rice: Sheath Blight and Potassium Deficiencies

Potassium deficiency in rice. Photo: LSU AgCenter

Scouting and Treating for Sheath Blight in Rice

As various fields pass midseason it’s time to scout closely for disease. Conditions seem to be nearly ideal for sheath blight development. For more on the topic, click here.

Potassium Deficiencies Starting to Show

With the wet fall, winter, spring, and early summer, it shouldn’t be a huge surprise to find some potassium (K) deficiencies. As we hit midseason, they’re bound to show up. One of the most obvious ways is for brown spot lesions to become common.

However, remember that cultivars differ in susceptibility to brown spot, so they can have a K deficiency and not have brown spot. Yellow/brown leaf margins may be present and the rice typically doesn’t “green up” with midseason N.

If K deficiency is suspected it is advised to tissue sample to confirm rather than rush to make a corrective application. Typically, K deficiency can be corrected all the way up to late boot, so confirm with tissue tests before potentially making the wrong correction.


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