Find It Here
Twitter update
Subscribe

Subscribe to Post Updates from Arkansas Row Crops


 

RSS AgNews
Quick Links
Agricultural Programs
07
Aug
2019
Floret Discolorations May Be Seen in Rice With Blank Panicles
Author: Yeshi Wamishe, Extension Rice Plant Pathologist

By Yeshi Wamishe, Extension Rice Pathologist

As rice plants get to maturity, different kinds of discolorations can be seen in some fields on glumes.  Discolorations are worse in glumes that are blank. Panicle blanking can be caused by different biotic and abiotic factors.  In some circumstances up to 5% grain blanking across a panicle can often be seen. Lower or higher, the glumes with no developing seed start dying and as a result, saprophytic fungi and bacteria grow on them rendering various kinds of discolorations. Pictures below show a few examples of panicle/glume discolorations in rice fields caused by biotic factors.  Florets discolorations are often severe under heavy dew or rain and if harvest is excessively delayed.

Glume discolorations after panicle blanking by insects

Glume discolorations after panicle blanking by insects

Saprophytic growth after panicle blanking by bacterial panicle blight

Saprophytic growth after panicle blanking by bacterial panicle blight

Glume discolorations after panicle blanking by blast

Glume discolorations after panicle blanking by blast

Glume discolorations by sooty molds and other saprophytes. Sooty molds are often confused for kernel smut.

Glume discolorations by sooty molds and other saprophytes. Sooty molds are often confused for kernel smut.

Glume discolorations due to brown spot

Glume discolorations due to brown spot

Panicle discoloration from sheath blight

Panicle discoloration from sheath blight

Panicle discoloration from false smut

Panicle discoloration from false smut

Discoloration due to eye spot

Discoloration due to eye spot

Examples of glume discolorations likely due to the growth of weak pathogens or saprophytes.

Example of glume discolorations likely due to the growth of weak pathogens or saprophytes.

Example of glume discolorations likely due to the growth of weak pathogens or saprophytes.

Example of glume discolorations likely due to the growth of weak pathogens or saprophytes.

Example of glume discolorations likely due to the growth of weak pathogens or saprophytes.

Example of glume discolorations likely due to the growth of weak pathogens or saprophytes.


Save pagePDF pageEmail pagePrint page

«
»