Graduate Thesis Or Dissertation
 

The roles of Verticillium dahliae, Colletotrichum atramentarium, Erwinia carotovora subsp. carotovora and E. carotovora subsp. atroseptica in "early dying" disease of potatoes

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/c534fs708

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  • The primary cause of "early dying" disease of potatoes in Oregon is Verticillium dahliae; however, Colletotrichum atramentarium, Erwinia carotovora subsp. carotovora (Ecc) and E. carotovora subsp. atroseptica (Eca) are also commonly isolated from diseased plants. Therefore, field and greenhouse studies were initiated to determine the relative involvement of each pathogen, directly and/or interactively with V. dahliae in the disease. Pathogenicity studies with 'Russet Burbank' potatoes were carried out in greenhouse pot culture to determine if C. atramentarium, Ecc and Eca can cause "early dying" disease similar to that caused by V. dahliae. Fifty-three days after root-dip inoculation, plants inoculated with Ecc, Eca or V. dahliae exhibited typical "early dying"disease symptoms, whereas those inoculated with C. atramentarium did not. Symptoms caused by V. dahliae were more severe than those caused by Ecc or Eca. In field studies with 'Norgold Russet' potatoes in 1980 (Columbia Basin and Klamath Basin) and in 1981 (Columbia Basin and Wallowa Valley), plant infection by V. dahliae was most strongly associated with symptom expression in plots previously cropped several times to potatoes; whereas plant infection by Ecc or Eca was most strongly associated with symptom expression in plots previously cropped one year or less to potatoes. In basal stem isolations made late in "early dying" disease epidemics, reductions were observed in the recovery of Eca and of V. dahliae. Decreases in Eca recovery were linked to plant infection by V. dahliae, whereas decreases in V. dahliae recovery were caused by basal plant infection by C. atramentarium. In co-inoculation studies the severity of symptom expression in V. dahliae inoculated 'Russet Burbank' was increased by Eca or Ecc, but was not influenced by C. atramentarium. The effect of V. dahliae and Eca, or V. dahliae and Ecc, on symptom expression was additive, rather than synergistic, and was due to an enhancement of stem colonization by V. dahliae.
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