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Interaction of an entomopathogenic f...

Flor, Lina Buscano.

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Interaction of an entomopathogenic fungus and black-legged ticks, Ixodes scapularis (Say) (Acari: Ixodidae).

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Interaction of an entomopathogenic fungus and black-legged ticks, Ixodes scapularis (Say) (Acari: Ixodidae)./
作者:	Flor, Lina Buscano.
面頁冊數:	182 p.
附註:	Adviser: Timothy J. Kurtti.
Contained By:	Dissertation Abstracts International67-07B.
標題:	Biology, Entomology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3225733
ISBN:	9780542793615

Interaction of an entomopathogenic fungus and black-legged ticks, Ixodes scapularis (Say) (Acari: Ixodidae).
Flor, Lina Buscano.

Interaction of an entomopathogenic fungus and black-legged ticks, Ixodes scapularis (Say) (Acari: Ixodidae). - 182 p.

Adviser: Timothy J. Kurtti.

Thesis (Ph.D.)--University of Minnesota, 2006.

I isolated a fungus from a female black-legged tick, Ixodes scapularis , from a white tailed deer. The isolate (SCIs3-2) was a Beauveria species that formed white colonies and turned creamy when mature. The fungus bore clustered flask-shaped conidiophores. The optimum temperature was 25°C with a maximum mean radial growth rate of 3.3 +/- 0.05 mm/day and a 97% germination rate. Phylogenetic analyses of the ITS and EF1-alpha sequences showed SCIs3-2 as Beauveria cf. bassiana, a species closely related to, but distinct from, B. bassiana sensu stricto.

ISBN: 9780542793615Subjects--Topical Terms:

1018619
Biology, Entomology.

Interaction of an entomopathogenic fungus and black-legged ticks, Ixodes scapularis (Say) (Acari: Ixodidae).
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245 1 0 $a Interaction of an entomopathogenic fungus and black-legged ticks, Ixodes scapularis (Say) (Acari: Ixodidae).
300 $a 182 p.
500 $a Adviser: Timothy J. Kurtti.
500 $a Source: Dissertation Abstracts International, Volume: 67-07, Section: B, page: 3561.
502 $a Thesis (Ph.D.)--University of Minnesota, 2006.
520 $a I isolated a fungus from a female black-legged tick, Ixodes scapularis , from a white tailed deer. The isolate (SCIs3-2) was a Beauveria species that formed white colonies and turned creamy when mature. The fungus bore clustered flask-shaped conidiophores. The optimum temperature was 25°C with a maximum mean radial growth rate of 3.3 +/- 0.05 mm/day and a 97% germination rate. Phylogenetic analyses of the ITS and EF1-alpha sequences showed SCIs3-2 as Beauveria cf. bassiana, a species closely related to, but distinct from, B. bassiana sensu stricto.
520 $a SCIs3-2 conidia adhered immediately to tick cuticle and germinated 24 to 48 hours post challenge. Conidia had low germination rates, ranging from 2% to 12% germination on different areas of the tick's body. Development of the germ tube was slow but penetration of the fungus into the tick's hard cuticle, intersegmental membrane of legs and natural openings was observed. Internal infection was evident 10 to 14 days post challenge. The fungus grew out of the tick's cuticle, producing conidia on surface of the cadaver. The cuticle proved to be the main barrier for fungal infection delaying disease initiation and mortality of I. scapularis ticks. The susceptibility of larvae and nymphs was dependent on age, instar and whether ticks were engorged or unfed. Survival of 6-7 week old unfed larvae four weeks after treatment was 20% (SEM +/- 10.4%) and when larvae were older (15-16 weeks post eclosion) survival after four weeks was 80% (+/- 8.0%). Engorged larvae treated 2-3 days post repletion (PR) were more susceptible (20% +/- 2.9% survival) to infection by conidia than engorged larvae treated 23 days PR. Development of SCIs3-2 in unfed nymphs was slow and there was an apparent delay in mortality. Old unfed nymphs were more susceptible to infection than middle-aged and young unfed nymphs. The isolate caused a significant decline in survival of larvae and nymphs over time. The developmental stage, timing of treatment, molting cycle and a blood meal will be critical factors to consider in the use of B. cf. bassiana to control I. scapularis in the field.
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791 $a Ph.D.
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