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10
Aug
2018
Glume Discolorations Following Panicle Blanking in Rice Fields
Author: Yeshi Wamishe, Extension Rice Plant Pathologist

By Yeshi Wamishe, Extension Rice Pathologist

Different discolorations can be seen on grain glumes as rice matures. It is worse on rice panicles that are blank. Panicle blanking can be caused by different biotic and abiotic factors and up to 5% grain blanking across a panicle is often seen. As the glumes die out, saprophytic fungi and bacteria grow on them and rotting starts. Pictures below show a few examples of panicle/glume discolorations in rice fields caused by biotic factors.  Discolorations are often severe when the environmental conditions are either wet and/or when harvest is 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.


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