Review of the Biological Control of Coccids on Coconut Palms in the Seychelles

Abstract

Reference is made to the several species of scale insects which were pests on coconuts and to the Coccinellids which were introduced to combat them.The introduction and life-history of Chilocorus nigritus is described.The survival of the introduced Coccinellids and the part each has played in controlling the several species of scale is noted.The habits of some indigenous Coccinellids are recorded.The coconut-feeding Coccids of the Seychelles are listed and their economic role mentioned.The incidence of “sooty-mould” and the species of Coccids responsible for its growth are discussed.An estimate is made of the value of the control effected by the Coccinellids in terms of increased copra production.