Towards integrated control of Epicerura pergrisea (Lepidoptera: Notodontidae), defoliator of Terminalia ivorensis and T. superba, in the Cote d'Ivoire

The commercial plantations of Terminalia spp. in the Cote d'Ivoire are periodically defoliated by caterpillars of Epicerura pergrisea Hampson. The insect damage significantly decreases the yield of plantations. Two insecticides were tested with satisfactory results. Within 24 h of application,...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Forest ecology and management 1991, Vol.39 (1-4), p.73-79
Hauptverfasser: Kanga, L, Fediere, G
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The commercial plantations of Terminalia spp. in the Cote d'Ivoire are periodically defoliated by caterpillars of Epicerura pergrisea Hampson. The insect damage significantly decreases the yield of plantations. Two insecticides were tested with satisfactory results. Within 24 h of application, decamethrin (trade name Decis) at a concentration of 9.6 g a.i. ha super(-1) and hydrogenoxalat of thiocyclam (trade name Evisect S) at a concentration of 300 g a.i. ha super(-1) caused 99% and 94% larval mortality, respectively. Also, these caterpillars showed susceptibility to an endemic virus disease in field populations. A natural epizootic was observed and extracts of dead larvae indicated the presence of small isometric RNA virus of 30 nm diameter. The pathogenicity tests in laboratory (per-os infection) indicated 60% larval mortality after one week and 100% mortality after 14 days of infection. This virus is a very promising control agent for use in an integrated control program against E. pergrisea .
ISSN:0378-1127
1872-7042