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(1,9). However, field observations indicated that the degree of clonal reaction to the toxin varied throughout the year. Initially, it was thought that either the pathogen cultures were losing their ability to produce toxin or that toxin solutions were losing their activity. Neither proved to be the case, so studies were initiated to determine possible host variability caused by environmental parameters. Since day length had no effect on susceptibility, studies involving the effect of temperature were initiated. This report documents the monthly deviation in clonal susceptibility and summarizes studies designed to better understand the influence temperature has on host-toxin interactions. Brief reports of this study (2, 11) have been published. Recently, the effects of temperature on the induction of resistance of pear leaves to Alteraria kikuchiana toxin has been reported (7).

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