Comparative analysis of rice (Oryza sativa Lin.) line and varietal performance in presence of Pyricularia grisea Sacc. within two seasons
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Abstract
behavior of short and mid-cycle rice lines and varieties in
presence of Blast (Pyricularia grisea Sacc.) was studied in
the experimental area of �??Caribe�?� Farm, Pinar del Río. A trial
was carried out in Blast Infection Beds (CIP), besides a Regio-
nal Study of Varieties (ERV), and leaf disease severity was
evaluated during the vegetative stage as well as its occurrence
in panicle necks during the reproductive stage. Results from
CIP within the cold season proved a strong disease severity,
only mid-cycle lines being resistant at the regional phase when
firstly evaluated 29 days after germination; disease was not
detected in panicle neck. In spring season, severity was very
low, so that all the lines were qualified as resistant; however,
they had a susceptible panicle neck. In the ERV, for cold season,
all varieties were susceptible to leaf infection, the short cycle
ones showing a better behavior: INCA LP-6, INCA LP-11 and
INCA LP-14; later, they became resistant to panicle neck
disease. In spring, leaf disease was not recorded, but all of
them were susceptible to panicle neck infection, INCA LP-16
standing out, as it was significantly different from the rest.
The experiment proved that varietal performance before the
disease varies from one season to another, depending on crop
cycle and its developing stage.
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