Efficiency of Gryon fulviventris (Hymenoptera: Scelionidae) as an egg parasitoid of Clavigralla tomentosicollis (Hemiptera: Coreidae) in northern Nigeria
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- Authors:
- ASANTE, S. K
JACKAI, L. E. N
TAMO, M - Author Affiliations:
- International Institute of Tropical Agriculture, Plant Health Management Division, P.M.B. 5320, Ibadan, Nigeria
- Source:
- Environmental entomology. 29(4):815-821
- Publication Date:
- 2000-01-01
- Language:
- English
- Abstract:
- Field surveys were conducted on cowpea and pigeon pea in 1995 and 1996 to assess the effect of indigenous egg parasitoids on populations of Clavigralla tomentosicollis Stål in northern Nigeria. From the egg masses of C. tomentosicollis, three species of Hymenoptera belonging to three families, namel Anastatus sp. (Eupelmidae), Ooencyrtus utetheisae (Risbec) (Encyrtidae), and Gryon fulviventris (Crawford) (Scelionidae), were recorded. Among them, G. fulviventris was found to be the most abundant parasitoid. Of a total of 3,502 egg masses collected on cowpea from four geographical locations, 2,587 (73.9%) were found to contain at least one egg parasitized by G fulviventris. From 56,072 eggs discovered, it parasitized 38,935 (69.4%). Overall, 74,724 eggs were collected from the four different locations and of these 52% were parasitized by G. fulviventris. However, parasitism rates varied with time and location. At one of the study sites (Minjibir, Kano) where weekly samples were collected throughout the growing season, the discovery efficiency, exploitation efficiency, and overall percentage parasitism increased significantly from July to November. Also, the proportion of eggs parasitized was found to be inversely related to the size of the egg mass. These findings are discussed in relation to the potential contribution of biological control in the integrated pest management of this economically important pest.
- Notes:
- Phytopathology. Agricultural zoology. Crops and forests protection
- Subjects:
- Agronomy, agriculture, phytopathology
Agronomie, agriculture, phytopathologie
Ecology
Ecologie
Entomology
Entomologie
Environment
Environnement
Sciences biologiques et medicales
Biological and medical sciences
Sciences biologiques fondamentales et appliquees. Psychologie
Fundamental and applied biological sciences. Psychology
Phytopathologie. Zoologie agricole. Protection des cultures et des forets
Phytopathology. Animal pests. Plant and forest protection
Protozoaires. Invertébrés
Protozoa. Invertebrates
Lutte
Control
Lutte biologique
Biological control
Angiospermae
Arthropoda
Dicotyledones
Entomophage
Entomophagous
Entomófago
Heteroptera
Hymenoptera
Insecta
Invertebrata
Leguminosae
Relation hôte parasite
Host parasite relation
Relación huesped parásito
Spermatophyta
Animal auxiliaire
Beneficial animal
Animal benéfico
Coreidae
Densité population
Population density
Densidad población
Déprédateur
Pest
Plaga
Efficacité parasitaire
Parasitic efficiency
Eficacia parasitaria
Hôte
Host
Huesped
Lutte biologique
Biological control
Lucha biológica
Légumineuse grain
Grain legume
Leguminosa grano
Oophage
Oophagous
Oófago
Parasitoïde
Parasitoid
Parasitoide
Scelionidae
Taux parasitisme
Parasitism rate
Tasa parasitismo
Variation saisonnière
Seasonal variation
Variación estacional
Vigna unguiculata
Clavigralla tomentosicollis
Gryon fulviventris
Nigeria du Nord - Geography:
- Afrique
Africa
Nigéria
Nigeria - Format:
- Academic Journal
- Database:
- PASCAL Archive
- Journal:
- Environmental entomology
- Volume:
- 29
- Issue:
- 4
- Page Start:
- 815
- Page Count:
- 7
- ISSN:
- 0046225X
- Publisher:
- Lanham, MD: Entomological Society of America, 2000.
- Document Type:
- Article
- Physical Description:
- print, 28 ref
