Arti-
ficial inoculation experiments showed that a 3 C increase, from 24
to 27 C, in the incubation temperature was sufficient for the reaction
of kabuli cv. Ayala and accession PV-1 to race 1A to shift from
moderately or highly resistant at constant 24 C to highly susceptible
at 27 C. A similar but less pronounced effect was found for
‘Ayala’ infected with race 6 (Landa et al., 2006). How