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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 5, No. 1, 1997, pp. 39-45
Bioline Code: cs97006
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 5, No. 1, 1997, pp. 39-45

 fr
Sathula, R.A.; Logan, J.M.; Munthali, D.C. & Nyirenda, G.K.C.

Résumé

Les caracteristiques biologiques de Cylas puncticollis Boheman ont ete etudiees sur la partie aerienne d'une variete exotique de patate douce (Ipomea batatas L.), Kenya (SPNO) dans une serre de selection a Chancellor College, Malawi depuis le premier juillet 1991 jusqu au 20 janvier 1992. La duree de vie d'insectes males etait entre 97 et 194 jours et celle de femelles allait de 53 a 213 jours. La difference dans la duree de vie des adultes entre les sexes etait insignifiante. La fecondite de femelles allait de 6 a 209 oeufs. L'oviparite a eu lieu dans les tiges et les petioles. Il n'y avait pas une difference importante en ce qui concerne l'oviparite sur les tiges ou les petioles, meme s'il y avait une grande disparite entre les semaines d'intervalle de determination (P<0.05). Les oeufs etaient pondus uniquement dans des trous creuses par les femelles. Soixante-quinze pour cent de trous scelles et vingt-six pour cent de trous non-scelles ont contenu des oeufs. La periode de larves a dure environ 21 jours alors que la duree de pupes etait de 7 jours.

Mots Clés
Biologie du Cylas, Ipomea batatas, Malawi

 
 en Adult longevity, fecundity and oviposition characteristics of Cylas puncticollis Boheman on sweet potatoes
Sathula, R.A.; Logan, J.M.; Munthali, D.C. & Nyirenda, G.K.C.

Abstract

The biological characteristics of Cylas puncticollis Boh. were studied on the aerial parts of an exotic sweet potato (Ipomea batatas L.) variety Kenya (SPNO) in the screenhouse at Chancellor College, Malawi from 1 July 1991 to 20 January 1992. The lifespan of males ranged from 97 to 194 days and that of females ranged from 53 to 213 days. The difference in the lifespan of adults between sexes was not significant. Fecundity of females ranged from 6 to 209 eggs. Oviposition occurred in vines and leaf petioles. There was no significant difference in oviposition between vines and leaf petioles, but it differed significantly (P<0.05) between assessment weeks. Eggs were laid singly in cavities excavated by females. Seventy five percent of the sealed cavities and 26% of the unsealed cavities contained eggs. Egg incubation period was not more than 7 days, larval period took about 21 days and the pupal period was about 7 days.

Keywords
Cylas biology, Ipomea batatas, Malawi

 
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