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Impact of the exotic parasitoid Epidinocarsis lopezi on cassava mealybug (Phenacoccus manihoti) Populations

Published online by Cambridge University Press:  19 September 2011

W. N. O. Hammond ,
P. Neuenschwander  and
H. R. Herren
W. N. O. Hammond
Affiliation:
International Institute of Tropical Agriculture, Oyo Road, PMB 5320, Ibadan, Nigeria
P. Neuenschwander
Affiliation:
International Institute of Tropical Agriculture, Oyo Road, PMB 5320, Ibadan, Nigeria
H. R. Herren
Affiliation:
International Institute of Tropical Agriculture, Oyo Road, PMB 5320, Ibadan, Nigeria
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Abstract

Epidinocarsis lopezi an exotic parasitoid to Africa, was first released to control the cassava mealybug (CM), Phenacoccus manihoti, at IITA (Ibadan) in November 1981, and a year later at Abeokuta, both in southwestern Nigeria. Population dynamics study of CM and its natural enemies was conducted for 4 years. CM population peaks usually occurred during the second half of the dry season (January–April). E. lopezi was the only natural enemy that was found during the whole year and in high densities. Parasitization rates of E. lopezi alternated with CM densities, thus suggesting a regulatory effect on CM populations by this parasitoid. CM populations were drastically reduced in release fields when compared with control fields. Subsequently CM populations have been maintained below injury levels for 4 years. E. lopezi is considered an efficient parasitoid of the CM.

Résumé

Les premiers lāchers d'Epidinocarsis lopezi, un parasitoïde non africain, en vue de lutter contre la cochenille du manioc Phenacoccus manihoti ont été réalisés à l'Iita d'Ibadan en novembre 1981 et, un an plus tard, à Abeokuta, dans le sud-ouest du Nigéria. Une étude de la dynamique des populations de cochenilles et de leurs ennemis naturels a été menée pendant 4 ans. Les colonies de cochenilles du manioc atteignent généralement leur paroxysme au cours de la seconde moitié de la saison sèche (de janvier à avril). E. lopezi est le seul ennemi naturel qui soit présent durant toute l'année et en fortes densités. Les taux de parasitisme d'E. lopezi fluctuent en fonction de la densité des populations de cochenilles, ce qui suppose un effet régulateur de ce parasitoïde sur les colonies de cochenilles. Ces dernières ont été fortement réduites dans les champs des lâchers, comparativement aux champs témoins. Elles ont pu, dès lors, être maintenues au-dessous du seuil critique pendant 4 ans. E. lopezi est considéré comme un parasitoïde efficace de la cochenille du manioc.

Keywords

Epidinocarsis lopeziPhenacoccus manihotibiological controlNigeriaEpidinocarsis lopeziPhenacoccus manihotilutte biologiqueNigéria
Type
Symposium XI: Africa-wide Biological Control Programme of Cassava Pests
Information
International Journal of Tropical Insect Science , Volume 8 , Issue 4-5-6: Recent Advances in Research on Tropical Entomology , December 1987 , pp. 887 - 891
Copyright
Copyright © ICIPE 1987

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References

REFERENCES

Boussienguet, J. (1986) Le complexe entomophage de la cochenille du manioc, Phenacoccus manihoti (Hom. Coccoidea Pseudococcidae) au Gabon. I. Inventaire faunistique et relations trophiques. Ann. Soc. Ent. Fr. (N.S.) 22, 35–44.CrossRefGoogle Scholar
Dempster, J. P. and Pollard, E. (1986) Spatial heterogeneity, stochasticity and the detection of density dependence in animal populations. OIKOS 46, 413–416.CrossRefGoogle Scholar
Fabres, G. and Matile-Ferrero, D. (1980) Les entomophages inféodés à la cochenille du manioc, Phenacoccus manihoti (Hom. Coccoidea Pseudococcidae) en République Populaire du Congo. I. Les composantes de l'entomocoenose et leurs inter-relations. Ann. Soc. Ent. Fr. (N.S.) 16, 509–515.CrossRefGoogle Scholar
Franz, J. M. (1973) Introductory review on the need for evaluation studies in relation to integrated control. J. Appl. Ecol. 10, 321–323.Google Scholar
Hahn, S. K. and Williams, R. J. (1973) Enquête sur le manioc en République du Zaire, 12–20 March 1973. Report to the Ministry of Agriculture of the Republique of Zaire (mimeo.).Google Scholar
Hassell, M. P. (1980) Foraging strategies, population models and biological control: a case study. J. Anim. Ecol. 49, 603–628.CrossRefGoogle Scholar
Hassell, M. P. (1985) Insect natural enemies as regulating factors. J. Anim. Ecol. 54, 323–334.CrossRefGoogle Scholar
Hassell, M. P. and May, R. M. (1973) Stability in insect host-parasite models. J. Anim. Ecol. 42, 693–736.CrossRefGoogle Scholar
Herren, H. R. (1981) Biological control of the cassava mealybug. In Tropical root crops, research strategies for the 1980s (Edited by Terry, E. R., Oduro, K. A. and Caveness, F.), pp. 79–80. Proc. First Triennial Root Crops Symposium, 8–12 Sept. 1980. Ibadan, Nigeria.Google Scholar
Herren, H. R. and Lema, K. M. (1982) CMB—first successful releases. Biocontrol News and Info., C.A.B. 3, 185.Google Scholar
Herren, H. R. and Lema, K. M. (1983) Follow-up on previous releases of natural enemies. UTA Annual Report for 1982 pp. 94–96. Ibadan, Nigeria.Google Scholar
Herren, H. R., Neuenschwander, P., Hammond, W. N. O. and Hennessey, R. D. (1985) Epidinocarsis lopezi in Africa. IITA Annual Report for 1984, 124–126. Ibadan, Nigeria.Google Scholar
Hodek, I., Hagen, K. S. and van Emden, H. F. (1972) Methods of studying effectiveness of natural enemies. In Applied Technology (Edited by van Emden, H. F.), pp. 147–188. Academic Press, London.Google Scholar
Hogarth, W. L. and Diamond, P. (1984) Interspecific competition in larvae between entomophagous parasitoids. Am. Nat. 124, 552–560.CrossRefGoogle Scholar
Kiritani, K. and Dempster, J. P. (1973) Different approaches to the quantitative evaluation of natural enemies. J. Appl, Ecol. 10, 323–330.Google Scholar
Legner, E. F. (1969) Distribution pattern of hosts and parasitization by Spalangia drosophilae (Hymenoptera: Pteromalidae). Can. Ent. 101, 551–557.CrossRefGoogle Scholar
Lema, K. M. and Herren, H. R. (1985) Release and establishment in Nigeria of Epidinocarsis lopezi, a parasitoid of the cassava mealybug, Phenacoccus manihoti. Ent. Exp. Appl. 38, 171–175.CrossRefGoogle Scholar
Lema, K. M., Herren, H. R. and Neuenschwander, P. (1984) Impact of E. lopezi on the CM. UTA Annual Report for 1983, pp. 119–120. Ibadan, Nigeria.Google Scholar
Matile-Ferrero, D. (1978) Cassava mealybug in the People's Republic of Congo. In Proc. Inter. Workshop on the Cassava Mealybug Phenacoccus manihoti Mat.-Ferr. (Pseudococcidae) 26–29 June 1977 (Edited by Nwanze, K. F. and Leuschner, K.), pp. 29–46. M'vuazi, Zaire.Google Scholar
Murdoch, W. W., Chesson, J. and Chesson, P. L. (1985) Biological control in theory and practice. Am. Nat. 125, 344–366.CrossRefGoogle Scholar
Neuenschwander, P., Hennessey, R. D. and Herren, H. R. (1987) Food web of insects associated with the cassava mealybug, Phenacoccus manihoti (Homoptera: Pseudococcidae), and its introduced parasitoid Epidinocarsis lopezi (Hymenoptera: Encyrtidae), in Africa. Bull. Ent. Res. 77 177–189.CrossRefGoogle Scholar
Neuenschwander, P., Lema, K. M. and Herren, H. R. (1984) Dispersal of Epidinocarsis lopezi. IITA Annual Report for 1983, pp. 118–119. Ibadan, Nigeria.Google Scholar
Neuenschwander, P. and Madojemu, E. (1986) Mortality of the cassava mealybug, Phenacoccus manihoti Mat. Ferr. (Hom. Pseudococcidae), associated with an attack by Epidinocarsis lopezi (Hym. Encyrtidae) Mitt. Schweiz. Ent. Ges. 59 57–62.Google Scholar
Nwanze, K. F. (1982) Relationships between cassava root yields and infestations by the mealybug, Phenacoccus manihoti. Trop. Pest. Manage. 28, 27–32.CrossRefGoogle Scholar
Stern, V. M., Smith, R. F. and van den Bosch, R. (1959) The integration of chemical and biological control of the spotted alfalfa aphid. Pt. I. The integrated control concept. Hilgardia 29, 81–101.CrossRefGoogle Scholar
Sylvestre, P. (1973) Aspects agronomiques de la production du manioc à la ferme d'état de Mantsumba (Rép. Pop. Congo), mission report (mimeo). IRAT, Paris.Google Scholar
van Lenteren, J. C. (1980) Evaluation of control capabilities of natural enemies: Does art have to become science? Netherl. J. Zool. 30, 369–381.CrossRefGoogle Scholar
Waage, J. K. (1983) Aggregation in field parasitoid populations: foraging time allocation by a population of Diadegma (Hymenoptera, Ichneumonidae). Ecol. Ent. 8, 447–453.CrossRefGoogle Scholar