Realtionship between Piriculariosis (Pyricularia grisea Sacc.) occurrence in rice (Oryza sativa Lin.) and different climatic variables at �??Los Palacios�?? Rice Agroindustrial Complex
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Abstract
the areas of �??Los Palacios�?? Rice Agroindustrial Complex (CAI),
Pinar del Río, with the objective of studying the monthly
behavior of leaf blast (Pyricularia grisea Sacc.) occurrence,
which is the most important rice disease worldwide and its
relationship with temperatures: maximum (Tmax), minimum
(Tmin) and mid (Tmid), relative humidity (Hr) and rainy days
(Dcll). Thus, data were subjected to variance analysis, tendency
and correlation; besides, a study of temporary series was made
by using the additive seasonal decomposition method. Results
showed that monthly disease occurrence was not correlated
with Hr but with Tmax, Tmin and Tmid, as well as Dcll.
Meanwhile Hr kept a slightly growing tendency of its mid
monthly values, Tmax, Tmin, Tmid and Dcll as well as P. grisea
occurrence had an increasing-decreasing tendency, which
constitutes a year-on-year variability example of these variables.
The resulting seasonal decomposition indexes enabled a better
understanding of the studied variable behaviour patterns that
make this variability evident, besides keeping with the
tendencies and variations observed in the current climate of
Cuba.
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