Fungous diseases of plants . l portion becomesdark and sunken. Neighbor-ing spots may also coalesce, sothat irregular sunken patchesmay result. The conidia inquantity have a pinkish tint,and the ulcerated areas developthe spores so profusely thatthis color becomes pronouncedunder favorable fungus may appear uponthe cotyledons or young hypo-cotyls of the seedlings, andthis is usually indicative ofbadly affected seed. The fungus. The myceliumpenetrates the affected partsto a considerable extent. Thebean seeds beneath the lesionson the pods are commonlyspotted or slightly discolore
Fungous diseases of plants . l portion becomesdark and sunken. Neighbor-ing spots may also coalesce, sothat irregular sunken patchesmay result. The conidia inquantity have a pinkish tint,and the ulcerated areas developthe spores so profusely thatthis color becomes pronouncedunder favorable fungus may appear uponthe cotyledons or young hypo-cotyls of the seedlings, andthis is usually indicative ofbadly affected seed. The fungus. The myceliumpenetrates the affected partsto a considerable extent. Thebean seeds beneath the lesionson the pods are commonlyspotted or slightly discolored,and a careful examinationwould show that the fungoushyphae are also present inthose parts. Distribution of thefungus another year is insuredthrough such infected seed. Beneath the cuticle or epidermis of the older spots a stromaticmass of hyaline hyphae is developed, and from this arise numer-ous short conidiophores bearing the irregularly elliptical conidia(Fig. 156). Near the margins of these spore pustules, or acervuli,. Fig. 154. Anthracnose op^ Beans(Photograph by H. H. Whetzel) 324 FUNGOUS DISEASES OF PLANTS
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