April
1999
, Volume
83
, Number
4
Pages
371
-
376
Authors
M. P. N.
Gent
,
Department of Forestry and Horticulture, Connecticut Agricultural Experiment Station, New Haven 06504
;
J. A.
LaMondia
,
Department of Plant Pathology and Ecology, Connecticut Agricultural Experiment Station, Windsor 06095
;
F. J.
Ferrandino
and
W. H.
Elmer
,
Department of Plant Pathology and Ecology, Connecticut Agricultural Experiment Station, New Haven 06504
; and
K. A.
Stoner
,
Department of Entomology, Connecticut Agricultural Experiment Station, New Haven
Affiliations
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RelatedArticle
Accepted for publication 5 January 1999.
Abstract
ABSTRACT
Single potato plants (Solanum tuberosum cv. Superior) were grown in microplots in soil that was fumigated and then infested with Verticillium dahliae, Pratylenchus penetrans, or both to evaluate the effects of these pathogens and of cultural treatments with spent mushroom compost or straw mulch on gas exchange of potato leaves. Photosynthesis and transpiration of terminal leaflets of a cohort of similar-aged leaves were measured once a week from the time of expansion until they senesced. Over all measurements, gas exchange per unit leaf area was less for plants in microplots infested with V. dahliae or P. penetrans than for those in uninfested plots. For leaves that expanded in early June, gas exchange was similar immediately after leaf expansion but declined more quickly when microplots were infested with one or both pathogens compared to no infestation. Overall, leaf gas exchange was increased by compost amendment but not affected by straw mulch. Compost amendment prevented some of the decline in gas exchange due to infestation by one or both pathogens. For leaves that expanded in July, compost increased the gas exchange immediately after expansion in both infested and non-infested plots.
JnArticleKeywords
Additional keywords:
lesion nematode,
photosynthesis,
Solanum tuberosum,
transpiration,
Verticillium wilt
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ArticleCopyright
© 1999 The American Phytopathological Society