Abstract
ENDOPHYTIC mycelium of various biotypes of Erysiphe graminis was demonstrated by Salmon1 in cereal leaves which had been mechanically damaged or heated to 50° C for short periods immediately prior to inoculation. Schnathorst2 obtained endophytic mycelium of E. cichoracearum in lettuce leaves by stripping one epidermis and inoculating the exposed mesophyll. Yarwood3 found that heat both predisposed cucumber cotyledons to infection by Sphaerotheca fuliginea4 and made them less responsive to subsequent heat therapy. Yarwood5 also demonstrated that heat treatment, abrasion or infection by Uroymces phaseoli rendered Phaseolus vulgaris susceptible to infection by S. fuliginea, by which it is not normally attacked, and Yarwood et al.6 and Nienhaus and Yarwood7 showed that some effects of heating one leaf of an opposite pair could be transmitted to the other, for example, increased susceptibility of bean and cowpea to a strain of tobacco mosaic virus.
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