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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 16, No. 1, 2008, pp. 67-74
Bioline Code: cs08009
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 16, No. 1, 2008, pp. 67-74

 en Density And Distribution Of Enset Root Mealybugs On Enset
Addis, Temesgen; Azerefegne, Ferdu & Blomme, G.

Abstract

The enset root mealybug ( Cataenococcus ensete check for this species in other resources Williams and Matile-Ferrero) has become the most important insect pest of enset ( Ensete ventricosum check for this species in other resources ) in southern Ethiopia. The objective of this study was to determine the distribution and density of enset root mealybugs on enset plants. The distribution of the enset root mealybug on enset roots and corms of the 'Genticha' clone was studied in 2005 on farmers' field at Yirgachefe, southern Ethiopia. An average of 87 adult enset root mealybugs were collected from roots and corms per plant. The majority of the mealybugs inhabited the roots (79%), while 21% was found on the corms. About 99% of the mealybugs were found in the upper 40 cm soil layer. In addition, about 90% of the mealybugs were collected within a 60 cm radius from the plants. The majority of the mealybugs (59%) were found on the upper half of the corm. About 63% of all mealybugs were collected from the corm and on the roots within a 20 cm radius from the corm. Both root and shoot fresh weight had a negative correlation (r2 = 0.58 and 0.92, respectively) with the enset root mealybug population density.

Keywords
Cataenococcus ensete, corm, Ensete ventricosum

 
 fr
Addis, Temesgen; Azerefegne, Ferdu & Blomme, G.

Résumé

L'enset mealybug de racine ( Cataenococcus ensete check for this species in other resources Williams et Matile-Ferrero) est devenu la peste de l'insecte le plus important d'enset ( Ensete ventricosum check for this species in other resources ) dans le Sud d'Ethiopie. L'objectif de cette étude était de déterminer la distribution et la densité d'enset mealybugs de racine sur les plantes d'enset. La distribution de l'enset mealybug sur les racines d'enset et les bulbes du clone de « Genticha » a été étudiée dans 2005 sur les agriculteurs › le champ à Yirgachefe, le Sud d'Ethiopie. Une moyenne de 87 enset adulte mealybugs de racine a été recueilli des racines et des bulbes par la plante. La majorité du mealybugs a habité les racines (79%), pendant que 21% a été trouvé sur les bulbes. Environ 99% du mealybugs ont été trouvé dans la couche du sol de 40 cm. Par ailleurs, environ 90% du mealybugs ont été recueilli dans un rayon de 60 cm des plantes. La majorité du mealybugs (59%) ont été trouvé sur le moitié supérieure du bulbe. Environ 63% de tout mealybugs ont été recueilli du bulbe et sur les racines dans un rayon de 20 cm du bulbe. Le poids frais de la racine et des rejetons a une corrélation négative (r2 = -0.76 et -0.96, respectivement) avec l'enset la densité de population de mealybug de racines.

Mots Clés
Cataenococcus ensete, le bulbe, Ensete ventricosum

 
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