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Epidemiology and etiology of potato ...

Nitzan, Nadav.

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Epidemiology and etiology of potato black dot, and the population structure of Colletotrichum coccodes in North America.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Epidemiology and etiology of potato black dot, and the population structure of Colletotrichum coccodes in North America./
Author:	Nitzan, Nadav.
Description:	112 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-07, Section: B, page: 3491.
Contained By:	Dissertation Abstracts International66-07B.
Subject:	Agriculture, Plant Pathology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3184158
ISBN:	9780542255748

Epidemiology and etiology of potato black dot, and the population structure of Colletotrichum coccodes in North America.
Nitzan, Nadav.

Epidemiology and etiology of potato black dot, and the population structure of Colletotrichum coccodes in North America. - 112 p.

Source: Dissertation Abstracts International, Volume: 66-07, Section: B, page: 3491.

Thesis (Ph.D.)--Washington State University, 2005.

The North American population structure of Colletotrichum coccodes; the effects of seed and soil-borne inocula, azoxystrobin application, seed-tuber generation, and soil fumigation with metam sodium on black dot development and severity; and the infection and colonization in-vivo were studied. One hundred and twenty-two North American isolates of C. coccodes from 13 states in the USA and 3 provinces in Canada were tested for vegetative compatibility. Six vegetative compatibility groups (VCGs) were detected using complementation tests of nitrate non-utilizing mutants. Pathogenicity trials indicated that isolate from all VCGs were aggressive to potato, whereas VCG 2 isolates are possibly the most aggressive. In-vitro growth at 10, 15, 18, 22 and 25°C indicated growth rate differences among the VCGs in relation to temperature. The effects of seed and soil-borne inocula of C. coccodes were tested in the greenhouse and the field. In the greenhouse, plants grown in infested soil had higher stem and root colonization than plants grown from infected seed, or from non-infected seed and in non-infested soil. In the field, disease severity was higher on plants grown from G1 seed-tubers than on plants grown from G3 seed-tubers. The greenhouse and field results indicated that soil-borne inoculum of C. coccodes is more dominant than seed-borne in black dot development. Field trials also indicated that azoxystrobin-based fungicides are effective against black dot, reducing disease severity infection of progeny tubers. Greenhouse and courtyard trials indicated that metam-sodium (VAPAMRTMHL) at a rate of 37.5 gallon/acre may eradicate soil-borne inoculum of C. coccodes, reducing disease severity on root and stem. However it has limited control over seed-borne inoculum. Infection and colonization by C. coccodes from air-borne inoculum was studied in-vivo by inoculating stems of 6 weeks old plants. Results indicated that C. coccodes is not the cause of plant senescence, but rather plant senescence induces stem colonization by the fungus, most likely due to increased levels of endogenic ethylene.

ISBN: 9780542255748Subjects--Topical Terms:

1028950
Agriculture, Plant Pathology.

Epidemiology and etiology of potato black dot, and the population structure of Colletotrichum coccodes in North America.
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520 $a The North American population structure of Colletotrichum coccodes; the effects of seed and soil-borne inocula, azoxystrobin application, seed-tuber generation, and soil fumigation with metam sodium on black dot development and severity; and the infection and colonization in-vivo were studied. One hundred and twenty-two North American isolates of C. coccodes from 13 states in the USA and 3 provinces in Canada were tested for vegetative compatibility. Six vegetative compatibility groups (VCGs) were detected using complementation tests of nitrate non-utilizing mutants. Pathogenicity trials indicated that isolate from all VCGs were aggressive to potato, whereas VCG 2 isolates are possibly the most aggressive. In-vitro growth at 10, 15, 18, 22 and 25°C indicated growth rate differences among the VCGs in relation to temperature. The effects of seed and soil-borne inocula of C. coccodes were tested in the greenhouse and the field. In the greenhouse, plants grown in infested soil had higher stem and root colonization than plants grown from infected seed, or from non-infected seed and in non-infested soil. In the field, disease severity was higher on plants grown from G1 seed-tubers than on plants grown from G3 seed-tubers. The greenhouse and field results indicated that soil-borne inoculum of C. coccodes is more dominant than seed-borne in black dot development. Field trials also indicated that azoxystrobin-based fungicides are effective against black dot, reducing disease severity infection of progeny tubers. Greenhouse and courtyard trials indicated that metam-sodium (VAPAMRTMHL) at a rate of 37.5 gallon/acre may eradicate soil-borne inoculum of C. coccodes, reducing disease severity on root and stem. However it has limited control over seed-borne inoculum. Infection and colonization by C. coccodes from air-borne inoculum was studied in-vivo by inoculating stems of 6 weeks old plants. Results indicated that C. coccodes is not the cause of plant senescence, but rather plant senescence induces stem colonization by the fungus, most likely due to increased levels of endogenic ethylene.
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