Fungous diseases of plants . ofthe tubers, or soft rots due to secondary organisms may ensue. The myceliumproduces micro-conidiaand macro-conidia (Fig. 150)abundantly in arti-ficial cultures, alsosome chlamydo-spores. On boiledpotatoes smallgreenish sclerotiaare developed, butno ascogenousstage has thus farbeen connectedwith this This fungus lives apparently for a considerable timein the soil, and a rotation of crops is essential whenever it be-comes of serious importance. Again, the use of pure seed onlyshould be allowed. If necessary, inspect by cutting a large num
Fungous diseases of plants . ofthe tubers, or soft rots due to secondary organisms may ensue. The myceliumproduces micro-conidiaand macro-conidia (Fig. 150)abundantly in arti-ficial cultures, alsosome chlamydo-spores. On boiledpotatoes smallgreenish sclerotiaare developed, butno ascogenousstage has thus farbeen connectedwith this This fungus lives apparently for a considerable timein the soil, and a rotation of crops is essential whenever it be-comes of serious importance. Again, the use of pure seed onlyshould be allowed. If necessary, inspect by cutting a large num-ber of the tubers which are to be used for this purpose. Alldiseased and discarded tubers should be burned and not returnedto the land. Seed tubers which may have come in contact withconidia should be treated as for potato scab. The sleepy disease of tomatoes which has been attributed toFiisarhim Lycopersici Sacc. may also be produced by the fungusabove described, although this point has not been Fig. 150. FusARiuM oxysporum: Mycelium, Conidia, AND ChLAMYDOSPORE FUNGI IMPERFECTI 319 XXIII. FLAX WILT Fiisafiiim Li/ii Bolley BoLLEY, H. L. Flax Wilt and Flax Sick Soil. N. D. Agl. Exp. Sta. : 27-60. This important flax disease, which is reported as particularlydestructive in North Dakota, seems to be characterized by symp-toms similar to many other diseases caused by species of Fusa-rium. Affected plants may be killed in the seedling stage, orthey may wilt and die at any time during the growing period. The fungus has been found to be ordinarily very abundant insoils in which flax has been grown several successive years, andit is considered to be thechief cause of the failureof flax upon land whereflax has previously beengrown. In fact, Bolleypoints to this fungus asthe cause of flax-sick would seem to be doubt-ful, however, if the actionof this fungus would ex-plain all the peculiar rela-tions of flax to the soilupon which it has beengr
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