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05
Nov
2015
Field responses of commercial rice cultivars
Author: Yeshi Wamishe, Extension Rice Plant Pathologist

By Yeshi Wamishe, Extension Rice Pathologist

Managing rice diseases begins with knowing a cultivar’s level of susceptibility.  The cultivar-by-disease reaction table below shows the disease information gathered from fields across Arkansas and some from other rice-producing states in The South.  Cells with no values do not imply resistance.

Fungicides are not the only answer to managing major diseases of rice.  While fungicides are most beneficial in well-managed fields, by the same token, well-managed fields require less or no fungicides.  In certain instances such as in fields with a history of repeated use of susceptible cultivars, fungicides may become a necessity. Resistant cultivars need to be integrated with good cultural management.  Weather plays a vital role in disease severity. Disease reactions below are disease severity levels under favorable weather conditions. Matching your fields to varieties of your choice based on disease reactions is beneficial. For instance, avoid planting blast-susceptible varieties where you have limited water sources, on sandier soils or fields surrounded by trees. Managing your potassium and nitrogen fertilizer inputs also plays a vital role in disease severity.

Reaction: R = Resistant; MR = Moderately Resistant; MS = Moderately Susceptible; S = Susceptible; VS = Very Susceptible (cells with no values indicate no definitive Arkansas disease rating information is available at this time). Reactions were determined based on historical and recent observations from test plots and in grower fields across Arkansas and other rice states in southern USA. In general, these ratings represent expected cultivar reactions to disease under conditions that most favor severe disease development. Table prepared by Y. Wamishe, Assistant Professor/Extension Plant Pathologist

Reaction: R = Resistant; MR = Moderately Resistant; MS = Moderately Susceptible; S = Susceptible; VS = Very Susceptible (cells with no values indicate no definitive Arkansas disease rating information is available at this time). Reactions were determined based on historical and recent observations from test plots and in grower fields across Arkansas and other rice states in southern USA. In general, these ratings represent expected cultivar reactions to disease under conditions that most favor severe disease development.
Table prepared by Y. Wamishe, Assistant Professor/Extension Plant Pathologist


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