On synthetic media, sporangia germinated in response to certain sugars and amino acids as well as cotton seed exudate. However, when produced in association with plant tissue or on media amended with α-phosphatidyl choline, sporangia failed to germinate in response to any sugar or amino acid tested individually or in combination, despite their ability to germinate in response to cotton seed exudate
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Eric B. Nelson (1989) studied this question.