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| 001 |
in00000016964 |
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20220104090746.0 |
| 008 |
880621s1986 xx a bm 000 0 eng d |
| 035 |
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|9 AAB1305AM
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| 035 |
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|a (OCoLC)18116281
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| 035 |
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|a (OCoLC)ocm18116281
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| 040 |
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|a TXA
|b eng
|c TXA
|d OCLCQ
|d OCLCF
|d OCLCO
|d OCLCQ
|d TXA
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| 043 |
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|a ncho---
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| 049 |
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|a TXAM
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| 099 |
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|a 1986
|a Disser-
|a tation
|a W187
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| 100 |
1 |
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|a Wall, George Clayton,
|d 1946-
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| 245 |
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|a A study of sorghum diseases in Honduras, their importance under different cropping systems, and strategies for their control /
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| 264 |
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|c 1986.
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| 300 |
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|a xii, 108 leaves :
|b illustrations ;
|c 29 cm
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| 336 |
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|a text
|b txt
|2 rdacontent
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| 337 |
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|a unmediated
|b n
|2 rdamedia
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| 338 |
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|a volume
|b nc
|2 rdacarrier
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| 500 |
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|a "Major subject: Plant Pathology."
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| 500 |
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|a Typescript (photocopy).
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| 500 |
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|a Vita.
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| 502 |
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|b Ph. D.
|c Texas A & M University
|d 1986
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| 504 |
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|a Includes bibliographical references (leaves 103-107).
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| 520 |
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|a Twenty-one sorghum diseases were identified in different sorghum-growing regions of Honduras, of which eight were studied with regard to their effect on sorghum yield. Sorghum downy mildew, caused by Peronosclerospora sorghi, was studied by comparing three near-isogenic populations (resistant, intermediate, and susceptible), planted in a disease-free site and in the presence of the disease. A 52% incidence of downy mildew reduced yields by 46%. Paired comparisons of diseased and healthy plants showed that maize dwarf mosaic, an aphid-transmitted virus disease, caused a 52% yield reduction on traditional land race cultivars. The same technique was used to study the effect of Acremonium wilt, caused by Acremonium strictum, which caused a 36% yield reduction on a susceptible cultivar (BTX623), and a 33% yield loss on land race cultivars. A holistic, multivariate study, carried out in subsistence farmers' fields, produced a multiple regression model for estimating sorghum yields based on plant height, panicle length, and disease severity data. Using this model, a 14.6% yield reduction was estimated to be caused by gray leaf spot (Cercospora sorghi), based on severity levels observed in farmers' fields. Rust (Puccinia purpurea) was estimated to cause a 3.5% yield reduction, and oval leaf spot (Ramulispora sorghicola) reduced yields by 5.5%. In controlled experiments using fungicide-protected and unprotected plots, zonate leaf spot (Gloeocercospora sorghi) caused a 15% yield reduction. Gray leaf spot, in a similar trial, reduced yields by 13.5% on the most popular improved cultivar (Tortillero). When cropping systems were compared, sorghum-maize was found to have a lower oval leaf spot severity than sorghum alone, but the maize dwarf mosaic incidence was higher. Early planting resulted in higher disease severities than late planting of photoperiod-sensitive land race cultivars. Improved cultivars had fewer diseases, but higher severities, than land race cultivars when both were planted in the late planting season in August. Sorghum-pigeon pea intercropping increased gray leaf spot severity, as compared to sorghum alone. Sorghum-bean intercropping did not affect sorghum disease severities, or yields...
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| 650 |
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|a Crop yields
|z Honduras
|x Mathematical models.
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| 650 |
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0 |
|a Sorghum
|x Diseases and pests
|z Honduras.
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| 650 |
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0 |
|a Sorghum
|x Losses
|z Honduras.
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| 650 |
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4 |
|a Major plant pathology.
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| 650 |
|
7 |
|a Crop yields
|x Mathematical models.
|2 fast
|0 (OCoLC)fst00883945
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| 650 |
|
7 |
|a Sorghum
|x Diseases and pests.
|2 fast
|0 (OCoLC)fst01126796
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| 650 |
|
7 |
|a Sorghum
|x Losses.
|2 fast
|0 (OCoLC)fst01126811
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| 651 |
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7 |
|a Honduras.
|2 fast
|0 (OCoLC)fst01206188
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| 655 |
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7 |
|a Academic theses
|2 lcgft
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| 700 |
1 |
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|a Craig, Jeweus,
|e degree committee member.
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| 700 |
1 |
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|a Frederiksen, Richard A.,
|e degree supervisor.
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| 700 |
1 |
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|a Jeger, Michael J.,
|e degree committee member.
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| 700 |
1 |
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|a Rosenow, Darrell T.,
|e degree committee member.
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| 710 |
2 |
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|a Texas A & M University,
|e degree granting institution.
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| 856 |
4 |
1 |
|u http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=749104731&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD
|z Link to ProQuest copy
|t 0
|
| 856 |
4 |
1 |
|u https://hdl.handle.net/1969.1/DISSERTATIONS-24934
|z Link to OAKTrust copy
|t 0
|
| 994 |
|
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|a C0
|b TXA
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| 999 |
f |
f |
|s 8e7cc2c7-607a-3974-b32e-d8c4b7bd9622
|i 71df5280-d086-3701-ba21-3c239a105def
|t 0
|
| 952 |
f |
f |
|p noncirc
|a Texas A&M University
|b J.J. Pickle Campus
|c High Density Repository
|s HDR
|d Remote Storage
|t 0
|e 1986 Dissertation W187
|h Other scheme
|i unmediated -- volume
|m A14839621377
|
| 952 |
f |
f |
|a Texas A&M University
|b College Station
|c Electronic Resources
|s www_evans
|d Available Online
|t 0
|e 1986 Dissertation W187
|h Other scheme
|
| 998 |
f |
f |
|a 1986 Dissertation W187
|t 0
|l Available Online
|
| 998 |
f |
f |
|a 1986 Dissertation W187
|t 0
|l Remote Storage
|