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Interaction of Entomopathogenic Nematodes (Steinernematidae) with Selected Species of Ixodid Ticks (Acari: Ixodidae)
Year:
1998
Source of publication :
Journal of Medical Entomology
Authors :
Glazer, Itamar
;
.
Volume :
35
Co-Authors:
Kocan, K.M., Dept. Anat., Pathol. and Pharmacol., College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, United States
Pidherney, M.S., Dept. Anat., Pathol. and Pharmacol., College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, United States
Blouin, E.F., Dept. Anat., Pathol. and Pharmacol., College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, United States
Claypool, P.L., Department of Statistics, Oklahoma State University, Stillwater, OK 74078, United States
Samish, M., Division of Parasitology, Kimron Veterinary Institute, Bet-Dagan 50250, Israel
Glazer, I., Department of Nematology, Volcani Center ARO Institute, Bet-Dagan 50250, Israel
Facilitators :
From page:
514
To page:
520
(
Total pages:
7
)
Abstract:
Entomopathogenic nematodes, currently used for biological control of various insect pests, were tested for their ability to penetrate and kill replete females of several species of ticks including Dermacentor variabilis (Say), Rhipicephalus sanguineus (Latreille), Amblyomma maculatum Koch, and A. cajennense (F.). These species were found to be susceptible to the entomopathogenic nematodes, Steinernema feltiae (Filipjev) or S. riobravus (Cabanillas & Poinar), shown in previous studies in our laboratory to be attracted to and kill replete A. americanum. S. riobravus killed D. variabilis (96%), R. sanguineus (89%), A. maculatum (24%), and A. cajennense (88%), and S. feltiae killed D. variabilis (91%) and R. sanguineus, (71%). Of the ticks that survived, mean egg mass weights were significantly lower than those of the unexposed controls. When nematode-exposed ticks were examined with light microscopy, nematodes were found to have entered ticks but did not multiply or produce subsequent generations of infective juveniles. The nematodes were separated from surrounding tissues by a clear space, suggesting that they produced protective compounds. Bacteria, thought to be symbiotes released from the nematodes, multiplied initially in the hemocoel of the tick and subsequently were found throughout the degenerating tick tissues. These bacteria eventually filled the tick and appeared to be the cause of tick death. Nematode guts were filled with the bacteria, suggesting that the bacteria were a food source. When ticks were exposed to nematodes while feeding on cattle, partially engorged females were most susceptible to the nematodes. Tick mortality and reduced egg production resulted when the ticks had fed 6 and 9 d before nematode exposure but not when ticks were exposed after 3 d of feeding. Exposure of feeding female ticks demonstrated that the nematodes were able to penetrate tick orifices other than via the hypostome, which was embedded in the bovine epidermis for the duration of the feeding process.
Note:
Related Files :
biological control
Entomopathogenic nematodes
interaction
Ixodid ticks
Steinernema feltiae
Steinernema riobravois
Show More
Related Content
More details
DOI :
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:

Itamar's own PDF.

ID:
21192
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:42
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Scientific Publication
Interaction of Entomopathogenic Nematodes (Steinernematidae) with Selected Species of Ixodid Ticks (Acari: Ixodidae)
35
Kocan, K.M., Dept. Anat., Pathol. and Pharmacol., College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, United States
Pidherney, M.S., Dept. Anat., Pathol. and Pharmacol., College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, United States
Blouin, E.F., Dept. Anat., Pathol. and Pharmacol., College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, United States
Claypool, P.L., Department of Statistics, Oklahoma State University, Stillwater, OK 74078, United States
Samish, M., Division of Parasitology, Kimron Veterinary Institute, Bet-Dagan 50250, Israel
Glazer, I., Department of Nematology, Volcani Center ARO Institute, Bet-Dagan 50250, Israel
Interaction of Entomopathogenic Nematodes (Steinernematidae) with Selected Species of Ixodid Ticks (Acari: Ixodidae)
Entomopathogenic nematodes, currently used for biological control of various insect pests, were tested for their ability to penetrate and kill replete females of several species of ticks including Dermacentor variabilis (Say), Rhipicephalus sanguineus (Latreille), Amblyomma maculatum Koch, and A. cajennense (F.). These species were found to be susceptible to the entomopathogenic nematodes, Steinernema feltiae (Filipjev) or S. riobravus (Cabanillas & Poinar), shown in previous studies in our laboratory to be attracted to and kill replete A. americanum. S. riobravus killed D. variabilis (96%), R. sanguineus (89%), A. maculatum (24%), and A. cajennense (88%), and S. feltiae killed D. variabilis (91%) and R. sanguineus, (71%). Of the ticks that survived, mean egg mass weights were significantly lower than those of the unexposed controls. When nematode-exposed ticks were examined with light microscopy, nematodes were found to have entered ticks but did not multiply or produce subsequent generations of infective juveniles. The nematodes were separated from surrounding tissues by a clear space, suggesting that they produced protective compounds. Bacteria, thought to be symbiotes released from the nematodes, multiplied initially in the hemocoel of the tick and subsequently were found throughout the degenerating tick tissues. These bacteria eventually filled the tick and appeared to be the cause of tick death. Nematode guts were filled with the bacteria, suggesting that the bacteria were a food source. When ticks were exposed to nematodes while feeding on cattle, partially engorged females were most susceptible to the nematodes. Tick mortality and reduced egg production resulted when the ticks had fed 6 and 9 d before nematode exposure but not when ticks were exposed after 3 d of feeding. Exposure of feeding female ticks demonstrated that the nematodes were able to penetrate tick orifices other than via the hypostome, which was embedded in the bovine epidermis for the duration of the feeding process.
Scientific Publication
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