Abstract
In aqueous suspension, conidia of Pezicula malicorticis (Jacks.) Nannf. germinated readily at the mean shade temperatures experienced in southern England in the period July to September. The percentage germination rate on cuticles detached from apple fruit, declined sharply in atmospheric humidities below 94% r.h., but conidia germinated well on intact apples stored at 93% r.h. In alternating wet and dry periods, germ-tubes were branched, with enhanced production of appressoria. Ungerminated conidia survived dry periods for up to 5 weeks, but on apples produced fewer lesions with increase in length of the period in the ungerminated state. Survival of germinated conidia depended partly on the length of the germ-tube and also on the mean ambient temperature. Extracts of apple peel containing phenolic compounds inhibited or reduced the pectolytic activity of culture filtrates of P. malicorticis . The inhibitory activity of these extracts fell as the fruit ripened both on the tree and after harvest.
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