A new bacterial leaf spot (pseudomonas sp) on holcus sorghum l and Zea mays L

Retrospective Theses and Dissertations 1925 A new bacterial leaf spot (pseudomonas sp) on holcus sorghum l and Zea mays L. James Blair Kendrick Iowa...
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Retrospective Theses and Dissertations

1925

A new bacterial leaf spot (pseudomonas sp) on holcus sorghum l and Zea mays L. James Blair Kendrick Iowa State College

Follow this and additional works at: http://lib.dr.iastate.edu/rtd Part of the Agricultural Science Commons, Agriculture Commons, Agronomy and Crop Sciences Commons, and the Plant Pathology Commons Recommended Citation Kendrick, James Blair, "A new bacterial leaf spot (pseudomonas sp) on holcus sorghum l and Zea mays L." (1925). Retrospective Theses and Dissertations. Paper 14781.

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UMI*

A H3W BAOmiAl. LEAF SPOT (PSETOOMOBAS SP.) OH KOLCUS SORGHUM L. AID) ZBA MAYS L.

By James Blair Kendriok

A IhesiB submitted to the Graduate faculty for the Degree of

])OOTOR OP PHILOSOPHY

Major subject Plant Pathology

Signature was redacted for privacy.

oh^ge of Major work. Signature was redacted for privacy.

Head of Major Department. Signature was redacted for privacy.

I^ean of Graduate College* Iowa State College 1925.

UMI Number: DP14479

UMI UMI Microform DP14479 Copyright 2006 by ProQuest Information and Learning Company. All rights reserved. This microform edition is protected against unauthorized copying under Title 17, United States Code.

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Table of Contents Introduotion—

Page — -1



k Review of Earlier Literature on Bacterial Spot Diseases on Gramineous Hosts-* - — - - — - -- 2 S^ptoms of tlie Disease on tlie Different Hosts* - - 7 Eolcus sorghum. H, sorghmn var# sudanensis and H. hale pens is*

7

Zea mays*



.9

Pennisetum glauoum. Chaetochloa lute scene and italioa.

-

11

Studios of the Causal Orgsniaa* - — - - — - - 12 Isolations from Zea mays*

—^12

t

Isolations from Holous species and Chaetochloa lute so ens* -

- — -14

Morphology of the causal organism. - - -

19

Cultural characters. - -- - — -

20

Temperature relations. - - — —

--33

Effect of freezing. ----

34

Effect of sunlight.

— - - — - -

36

Resistance to desiccation. - - — - ---^-.36 Taxonomy of the Causal Organism and its Host Range*38 Taxonomy. - —

— - - — - -- 28

Host range of the Holcus bacterial spot. - — .45 Relation of Parasite to Host Tissue. - - — - --48 Pathogenicity studies. — - -

— - — -48

"T~ /

i

?ag8 Infection. - - — —

- - 5 7

Seed transmission.Overwintering.



Control. Stuamary. Literature cited. Plates.





58

— -63 ---66





67

— - -- — — — -70

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sp«)

m Eoisus sommm L* ahs m miB if. Mva^tixm A baatosrisil Xdiif spot Aismm hss

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