Annual report of the North Carolina Agricultural Experiment Station . Fig. 12.—Portion of compact rhizomorphicstrand of the fungus from sweet potato culture ofascigerous stage; a is a young perithecium (photo-micrograph) .. Fig. 13.—Portion of tip of rhizomorphic strand similar to Fig. 12 (x 385). On autoclaved green cowpea stems the internal fungus rapidly made a veryprofuse cottony growth of mycelium (Fig. 10), tubes a and c. Comparativelyfew conidia of any kind were produced. Both micro- and macro-conidia werefound. FUSARIUM CAUSING COWPEA WILT. 113 ? The ascigerous fungus made very poor, s
Annual report of the North Carolina Agricultural Experiment Station . Fig. 12.—Portion of compact rhizomorphicstrand of the fungus from sweet potato culture ofascigerous stage; a is a young perithecium (photo-micrograph) .. Fig. 13.—Portion of tip of rhizomorphic strand similar to Fig. 12 (x 385). On autoclaved green cowpea stems the internal fungus rapidly made a veryprofuse cottony growth of mycelium (Fig. 10), tubes a and c. Comparativelyfew conidia of any kind were produced. Both micro- and macro-conidia werefound. FUSARIUM CAUSING COWPEA WILT. 113 ? The ascigerous fungus made very poor, scanty growth at first. Even twoweeks after inoculation scarcely any mycelium could be seen. By the end ofthe third week, however, the growth of mycelium had become more prominent(Fig. 10, tubes 1) and d) and perithecia began to appear abundantly. Themycelium, however, was of a grayish white color and never became so floccoseor profuse as that from the internal fungus. No macroconidia were found. On Sweet Potato the growth of the internal fungus was very similar to thaton Irish potato.
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