Abstract
The Japanese pear pathotype of Alternaria alternata, which causes black spot disease, produces multiple host-selective toxins (AK-toxins I and II) in culture; the strawberry pathotype, which causes black spot disease, also produces a series of analogous host-selective toxins (AF-toxins I, II, and III). Analysis by high-performance liquid chromatography of toxin production during spore germination showed that virulent isolate A85-10 of the Japanese pear pathotype produced about 0.02 pg of AK-toxin I per spore in the first 6 hr after germination and a trace amount of AK-toxin II after 24 hr (...)
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