Titre :	Bioecology of sorghum head bug Eurystylus immaculatus and crop losses in West Africa
Type de document :	texte imprimé
Auteurs :	A. Ratnadass, Auteur ; Y.O. Doumbia, Auteur ; O. Ajayi, Auteur
Année de publication :	1995
Importance :	p 91-102
Langues :	Anglais (eng)
Catégories :	SCIENCES AGRICOLES
Mots-clés :	BIOECOLOGIE  SORGHO  EURYSTYLUS IMMACULATUS  PERTE DE RECOLTE  AFRIQUE ORIENTALE
Résumé :	The life cycle (pre-oviposition, egg incubation and nymphal development periods) and other bioecological parameters (nymphal survival), sex ratio, adult longevity, female fecundity and hatching rate) of the sirghum head bug Eurystylus immaculatus were determined in the laboratory at Samanko Mali in 1991/92 and 1993 and at Bagauda, Nigeria in 1992/93. Head bug population dynamics surveys conducted at Sotuba, Mali, showed two peaks of infestation, in late september and late october both in 1989 and 1990. At Samanko, there were four head bug generation in 1991 and three in 1992. In 1989 at Bagauda, the highest E.immculatus population occurred at the soft dough stage. The contributions of head bug feeding and egg-laying punctures in the overall damage to sorghum grains were studied in 1991 at Farako-Bâ, Burkina Faso. At Sotuba, correlation between bug damage and grain mold infection was low in 1990 and veru high in 1991, this was due to differences in humidity levels. Bug attack alone accounted for most of overall damage to sorghum. Using cypermethrin protection at Bagauda, avoidable sorghum grain yield losses due to head bugs were 83% in 1989 and 21% in 1990, the difference being due to differences in infestation levels. The economic injurylevel was 2.52 E.immaculatus per panicle in 1989 and 0.97 in 1990.
Numéro du document :	A 96000/H00
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PROTECTION DES VEGETAUX
Bull2 (Theme secondaire) :	RAVAGEURS DES PLANTES

Bioecology of sorghum head bug Eurystylus immaculatus and crop losses in West Africa [texte imprimé] / A. Ratnadass, Auteur ; Y.O. Doumbia, Auteur ; O. Ajayi, Auteur . - 1995 . - p 91-102.
Langues : Anglais (eng)

Catégories :	SCIENCES AGRICOLES
Mots-clés :	BIOECOLOGIE  SORGHO  EURYSTYLUS IMMACULATUS  PERTE DE RECOLTE  AFRIQUE ORIENTALE
Résumé :	The life cycle (pre-oviposition, egg incubation and nymphal development periods) and other bioecological parameters (nymphal survival), sex ratio, adult longevity, female fecundity and hatching rate) of the sirghum head bug Eurystylus immaculatus were determined in the laboratory at Samanko Mali in 1991/92 and 1993 and at Bagauda, Nigeria in 1992/93. Head bug population dynamics surveys conducted at Sotuba, Mali, showed two peaks of infestation, in late september and late october both in 1989 and 1990. At Samanko, there were four head bug generation in 1991 and three in 1992. In 1989 at Bagauda, the highest E.immculatus population occurred at the soft dough stage. The contributions of head bug feeding and egg-laying punctures in the overall damage to sorghum grains were studied in 1991 at Farako-Bâ, Burkina Faso. At Sotuba, correlation between bug damage and grain mold infection was low in 1990 and veru high in 1991, this was due to differences in humidity levels. Bug attack alone accounted for most of overall damage to sorghum. Using cypermethrin protection at Bagauda, avoidable sorghum grain yield losses due to head bugs were 83% in 1989 and 21% in 1990, the difference being due to differences in infestation levels. The economic injurylevel was 2.52 E.immaculatus per panicle in 1989 and 0.97 in 1990.
Numéro du document :	A 96000/H00
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PROTECTION DES VEGETAUX
Bull2 (Theme secondaire) :	RAVAGEURS DES PLANTES