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Effects of formulated imidacloprid on two mite pathogens, Neozygites floridana (Zygomycotina: Zygomycetes) and Hirsutella thompsonii (Deuteromycotina: Hyphomycetes)

Published online by Cambridge University Press:  19 September 2011

Surenda K. Dara  and
Fabien C. C. Hountondji
Surenda K. Dara
Affiliation:
Plant Health Management Division, International Institute of Tropical Agriculture, 08 B.P. 0932 Cotonou, Rep. of Benin
Fabien C. C. Hountondji*
Affiliation:
Plant Health Management Division, International Institute of Tropical Agriculture, 08 B.P. 0932 Cotonou, Rep. of Benin
*
Corresponding author: FCCH. E-mail: f.hountodji@cgiar.org
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Abstract

Neozygites floridana (Weiser & Muma) Remaudière & Keller and Hirsutella thompsonii Fisher are important fungal pathogens of mites on cassava in Benin. Bioassays were conducted to evaluate the influence of four concentrations (50, 100, 200 and 500 ppm) of a water-dispersible formulation (Gaucho 70 WS) of imidacloprid on the conidial germination of these two fungi. Imidacloprid significantly reduced the germination of primary conidia and formation of infective capilliconidia in N. floridana. In contrast, imidacloprid concentrations of 100 ppm and above increased conidial germination in H. thompsonii. Another bioassay was conducted to evaluate possible synergism between imidacloprid and H. thompsonii in the mortality of the cassava green mite, Mononychellus tanajoa (Bondar). Hirsutella thompsonii alone and in combination with imidacloprid both killed around 95% of the mites after five days. In contrast, the mortality of mites treated with imidacloprid alone was close to that of untreated mites, which was around 30% on the fifth day after treatment.

Résumé

Neozygites floridana (Weiser & Muma) Remaudière & Keller et Hirsutella thompsonii Fisher sont des champignons pathogènes des acariens du manioc au Bénin. Des essais ont été conduits afin d'évaluer l'influence de quatre différentes concentrations (50,100,200 et 500 ppm) de la formulation en poudre hydrosoluble de l'insecticide imidacloprid sur la germination des conidies des deux champignons. Les résultats prouvent une action spécifique de l'imidacloprid sur chacun'des deux champignons. La germination des conidies primaires et des capilloconidies de N. floridana est significativement affectée, alors que chez H. thompsonii, le pourcentage de germination est significativement plus élevé aux plus fortes concentrations. Vu ces résultats, de nouveaux essais ont été entrepris pour évaluer une éventuelle synergie de l'imidacloprid et de H. thompsonii pour lutter contre l'acarien vert du manioc, Mononychellus tanajoa Bondar. Comparativement au traitement à l'imidacloprid seul, la mortalité est significativement plus élevée chez les acariens traités avec H. thompsonii seul ou avec ia combinaison imidacloprid-H. thompsonii. L'efficacité entre ces deux derniers traitements est comparable.

Keywords

imidaclopridMononychellus tanajoaNeozygites floridanaHirsutella thompsoniisynergismimidaclopridMononychellus tanajoaNeozygites floridanaHirsutella thompsoniisynergisme
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 21 , Issue 2 , June 2001 , pp. 133 - 138
Copyright
Copyright © ICIPE 2001

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References

REFERENCES

Boucias, D. G., Stokes, C., Storey, G. and Pendland, J. C. (1996) The effects of imidacloprid on the termite Reticulitermes flavipes and its interaction with the mycopathogen Beauveria bassiana. Pflanzenschutz-Nachr. Bayer 49, 105–151.Google Scholar
Brandenberg, R. L. and Kennedy, G. G. (1983) Interactive effects of selected pesticides on the two-spotted spider mite and its fungal pathogen Neozygites floridana. Entomol. Exp. Applic. 34, 240–244.CrossRefGoogle Scholar
Dara, S. K., Lomer, C. J., Hountondji, F. C. C. and Yaninek, J. S. (1998) Fungal pathogens of mites on cassava, field and laboratory studies. VII International Colloquium on Invertebrate Pathology and Microbial Control, p. 23, August 23–28, Sapporo, Japan.Google Scholar
Eayre, C. G., Jaffe, B. A. and Zehr, E. I. (1990) Influence of potassium on spore germination in the nematophagous fungus, Hirsutella rhossiliensis. Journal of Nematology 22, 612–613.Google ScholarPubMed
Elbert, A., Becker, B., Hartwig, J. and Erdelen, C. (1991) Imidacloprid—A new systemic insecticide. Pflanzenschutz-Nachr. Bayer 44, 113–136.Google Scholar
Gustafsson, M. (1965) On species of the genus Entomophthora fres, in Sweden I. classification and distribution. Lantbrukshogskolans Annaler 31, 405–457.Google Scholar
Hiromori, H. and Nishigaki, J. (1998) Joint action of an entomopathogenic fungus (Metarhizium anisopliae) with synthetic insecticides against the scarab beetle, Anomala cuprea (Coleoptera: Scarabeidae) larvae. Appl. Entomol. Zool. 33, 77–84.CrossRefGoogle Scholar
James, D. G. (1997) Imidacloprid increases egg production in Amblyseius victoriensis (Acari, Phytoseiidae). Exp. Appl. Acarol. 21, 75–82.CrossRefGoogle Scholar
Kaakeh, W., Reid, B. L., Bohnert, T. J. and Bennett, G. W. (1997) Toxicity of imidacloprid in the German cockroach (Dictyoptera, Blattellidae), and the synergism between imidacloprid and Metarhizium anisopliae (Imperfect fungi, Hyphomycetes). J. Econ. Entomol. 90, 473–482.CrossRefGoogle Scholar
Koppenhöfer, A. M., Kaya, H. K. and Klein, M. G. (1997) Synergism of imidacloprid and entomopathogenic nematodes, a novel approach to white grub control in turfgrass, pp. 37–38. In 30th Annual Meeting of the Society for Invertebrate Pathology, August 24–29, Banff, Canada.Google Scholar
Leicht, W. (1993) Imidacloprid—a chloronicotinyl insecticide. Pestic. Outlook 4, 17–24.Google Scholar
Le Rü, B., Silvie, P. and Papierok, B. (1985) L'entomophthorale Neozygites fumosa pathogène de la cochenille du manioc, Phenacoccus manihoti (Hom.: Pseudococcidae), en Republique populaire du Congo. Entomophaga 30, 23–29.Google Scholar
Manandhar, J. B. and Bruehl, G. W. (1973) In vitro interactions of Fusarium and Verticillium wilt fungi with water, pH, and temperature. Phytopathology 63, 413–419.CrossRefGoogle Scholar
McCoy, C. W., Quintela, E. D. and Krueger, S. R. (1998) Synergy in laboratory and field applications of imidacloprid with entomopathogenic fungi in weevil control, pp. 32–33. In VII International Colloquium on Invertebrate Pathology and Microbial Control, August 23–28, Sapporo, Japan.Google Scholar
Quintela, E. D. (1996) Synergistic effect of imidacloprid on conidial germination and the pathogenicity of two entomopathogenic fungi to larvae of Diaprepes abbreviatus (Coleoptera, Curculionidae). PhD Dissertation, University of Florida, Gainesville.Google Scholar
Quintela, E. D. and McCoy, C. W. (1997a) Conidial germination enhancement of Metarhizium anisopliae and Beauveria bassiana with imidacloprid, p. 53. In 30th Annual Meeting of the Society for Invertebrate Pathology, August 24–29, Banff, Canada.Google Scholar
Quintela, E. D. and McCoy, C. W. (1997b) Effects of imidacloprid on development, mobility, and survival of first instars of Diaprepes abbreviatus (Coleoptera, Curculionidae). J. Econ. Entomol. 90, 988–995.CrossRefGoogle Scholar
Quintela, E. D. and McCoy, C. W. (1997c) Pathogenicity enhancement of Metarhizium anisopliae and Beauveria bassiana to first instars of Diaprepes abbreviatus (Coleoptera, Curculionidae) with sublethal doses of imidacloprid. Environ. Entomol. 26, 1173–1182.CrossRefGoogle Scholar
Quintela, E. D. and McCoy, C. W. (1998a) Synergistic effect of imidacloprid and two entomopathogenic fungi on the behavior and survival of larvae of Diaprepes abbreviatus (Coleoptera, Curculionidae) in soil. J. Econ. Entornol. 91, 110–122.CrossRefGoogle Scholar
Quintela, E. D. and McCoy, C. W. (1998b) Conidial attachment of Metarhizium anisopliae and Beauveria bassiana to the larval cuticle of Diaprepes abbreviatus (Coleopterea: Curculionidae) treated with imidacloprid. J. Inverteb. Pathol. 72, 220–230.CrossRefGoogle Scholar
Saito, T., Kubota, S. and Shimazu, M. (1989) A first record of entomopathogenous fungus, Neozygites parvispora (MacLeod & Carl) Rem. & Kell., on Thrips palmi Karny (Thysanoptera: Thripidae) in Japan. Appl. Ent. Zool. 24, 233–235.CrossRefGoogle Scholar
SAS Institute (1996) SAS User's Guide, Statistics, Release 6.12. SAS Institute, Cary, NC.Google Scholar