Root rot of hydroponically grown lettuce caused by Phytophthora cryptogea

Persistent Link:
http://hdl.handle.net/10150/277895
Title:
Root rot of hydroponically grown lettuce caused by Phytophthora cryptogea
Author:
Linde, Alec Robert, 1956-
Issue Date:
1991
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
In April 1989, lettuce (Lactuca sativa L.) plants showing severe root rot symptoms were received for diagnosis from a commercial hydroponic facility in Southern California. A species of Phytophthora was consistently isolated from necrotic roots. Pathogenicity trials were conducted under hydroponic conditions in a greenhouse at root temperatures of 18 and 28 C. Root necrosis, along with stem decay and plant death, occurred within 5-7 days after inoculation at both temperatures. Reisolation of the fungus from roots and stems of inoculated, but not from roots of non-inoculated plants, confirmed pathogenicity. The fungus was identified as Phytophthora cryptogea Pethybr. and Lafferty on the basis of cultural and morphological characteristics. However, crosses with A1 and A2 mating types of Phytophthora cryptogea and other species of Phytophthora were not successful. This is the first report of Phytophthora as a root pathogen of cultivated lettuce.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Agriculture, Plant Culture.; Agriculture, Plant Pathology.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College
Degree Grantor:
University of Arizona
Advisor:
Stanghellini, Michael E.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleRoot rot of hydroponically grown lettuce caused by Phytophthora cryptogeaen_US
dc.creatorLinde, Alec Robert, 1956-en_US
dc.contributor.authorLinde, Alec Robert, 1956-en_US
dc.date.issued1991en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractIn April 1989, lettuce (Lactuca sativa L.) plants showing severe root rot symptoms were received for diagnosis from a commercial hydroponic facility in Southern California. A species of Phytophthora was consistently isolated from necrotic roots. Pathogenicity trials were conducted under hydroponic conditions in a greenhouse at root temperatures of 18 and 28 C. Root necrosis, along with stem decay and plant death, occurred within 5-7 days after inoculation at both temperatures. Reisolation of the fungus from roots and stems of inoculated, but not from roots of non-inoculated plants, confirmed pathogenicity. The fungus was identified as Phytophthora cryptogea Pethybr. and Lafferty on the basis of cultural and morphological characteristics. However, crosses with A1 and A2 mating types of Phytophthora cryptogea and other species of Phytophthora were not successful. This is the first report of Phytophthora as a root pathogen of cultivated lettuce.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectAgriculture, Plant Culture.en_US
dc.subjectAgriculture, Plant Pathology.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorStanghellini, Michael E.en_US
dc.identifier.proquest1343847en_US
dc.identifier.bibrecord.b2687443xen_US
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