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Effects of cassava pubescence on the behaviour, post-embryonic development and reproduction of the cassava mealybug, Phenacoccus manihoti Matile-Ferrero (Homoptera: Pseudococcidae)

Published online by Cambridge University Press:  19 September 2011

T. Kasu ,
J.A. Odebiyi  and
K.M. Lema
T. Kasu
Affiliation:
Department of Agricultural Biology, University of Ibadan, Nigeria
J.A. Odebiyi
Affiliation:
Department of Agricultural Biology, University of Ibadan, Nigeria
K.M. Lema
Affiliation:
International Institute of Tropical Agriculture (IITA) Ibadan, Nigeria
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Abstract

Role of trichome density in cassava resistance to mealybug, Phenacoccus manihoti Matile-Ferrero was evaluated on the apex, the first expanded leaf and the stem in pubescent and glabrous cassava varieties. Pubescence significantly retarded the rate of settling and establishment of P. manihoti. The weight of the developing larvae was also affected becoming more pronounced at the pre-ovipositing adult stage. However, the relationship between pubescence and P. manihoti weight was not significant. Moreover, the significant differences in weight at the preovipositing adult stage was not reflected in the corresponding fecundity on the glabrous and pubescent varieties. Pubescence accounted for only 18% of the differences in observed fecundity. There was also no significant difference in the development period of the mealybug on glabrous and pubescent varieties. Pubescence appeared to be a mechanical irritant only.

Résumé

Deux types de varietes de manioc, glabre et pubescente, ont ete soumis a l'etude due comportement, du developpement post-embryonnaire et de reproduction de la cochenille farineuse du manioc, Phenacoccus mannihoti Matile-Ferrero, dans les conditions de serre, aux temperature et humidite relative moyennes de 30.2°C et 72.4% respectivement.

L'infestation de varietes pubescentes etait forterment retardee jusqu'a affecter le poids vif des larves de deuxieme et troisieme stades; l'effet etait plus prononcee sur le stade de preoviposition. Aucune observation similaire, tributaire a la pubescence, n'etait faite au sujet de la fecondite de l'insecte sur les plantes soit hirsutes ou glabres; 18% de differences observees sur la fecondite decoulaient de la pubescence. Aucune difference significative n'etait observee dans la duree de developpement de cochenilles sur les deux types de varietes de manioc. Dans les conditions experimentales presentes, la pilosite, chez le manioc semble exercer un role irritant sur la cochenille farineuse.

Keywords

Cassava mealybugglabrous/pubescent plantsfeedingweightfecundityhydrocyanic acid
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 10 , Issue 2 , April 1989 , pp. 123 - 129
Copyright
Copyright © ICIPE 1989

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References

REFERENCES

Akibo-Betts, D.A.T. (1982) Resistance of rice grains to infestation by Sitotroga cerealella Oliv. (Lepidoptera: Gelechiidae). Ph.D. Thesis, Department of Agricultural Biology, University of Ibadan, Ibadan, Nigeria.Google Scholar
Atsatt, R. and Dowd, D.J.O. (1976) Plant defense guilds. Science 19, 24–29.CrossRefGoogle Scholar
Engelmann, F. (1970) The Physiology of Insect Reproduction. Pergamon Press Inc. Oxford. Great Britain.Google Scholar
Gibson, R.W. (1971) Glandular hairs providing resistance to aphids in certain wild potato species. Ann. Appl. Biol. 68, 113–119.CrossRefGoogle Scholar
Hahn, S.K. (1982) A preliminary report on cassava mealybug research at IITA. In Proceedings of International Workshop on Control of Cassava Mealybug and Green Spider Mite (Edited by Okoli 0.0. et al.), pp. 33–34. Umudike, Nigeria. October 12–16, 1981.Google Scholar
Hill, D.S. and Waller, J.M. (1982) Pests and diseases of tropical crops. Principles and Methods of Control. Vol. 1. Longman Group Ltd., Essex, U.K.Google Scholar
IITA (1982) International Institute of Tropical Agriculture Research Highlights for 1981. pp. 41–44.Google Scholar
Pillemer, E.A. and Tingey, W.M. (1976) Hooked trichomes. A physical plant barrier to a major agricultural pest. Science 193, 482–484.CrossRefGoogle ScholarPubMed
Pronam (1981) Programme National Manioc, Zaire. Annual Report 1981 B.P. 11635 Kinshasa 1, Republic of Zaire.Google Scholar
Schillinger, J.A.J. and Gallun, R.L. (1968) Leaf pubescence of wheat as a deterrent to the cereal leaf beetle, Oulema melanopus (L.). Ann. Entomol. Soc. Am. 61, 900–902.CrossRefGoogle Scholar
Singh, B.B., Hadley, H.H. and Bernard, R.L. (1971) Morphology of pubescence in soybean and its relationship to plant vigour. Crop Sci. 11, 13–16.CrossRefGoogle Scholar