Vergara - 1976 - Physiological and morphological adaptability of ri

EPIDEMIOLOGY timF SOUTHERN cram LEAF BLIGHT 401
When the number ofconidia per mm! was averaged over the eight dew tenlperatures,
the increase in sporulatiim with increasing dew periods appeared to
assume virtually a straight-line relationship (Fig, 2). A similar trend was evident
among dew temperatures when spore counts were averaged over the four dew
periods. Early disease onset can be negated by climatic factors and particularly‘
those that affect sporulation. The fact that infection can take place. for example.
during periods of l2 hr ofdew at 16°C is oflittlc substance to disease increase if
existing lesions fail to contribute the necessanr‘ inoculum.
Other related studies demonstrated that: (l) higher colonization temperatures
resulted in increased sporulation; (2) darkening during colonization and sporul-
mo)
lesion
§
rus
Spuusirn/rrmz
2. Observed sporulation of race T of Heimmthosprizem mayms on Tms corn
seedlings subjected to various combinations of dew temperature ("C) and dew
period
(hr).