Control of trunk longicorns in cocoa

Abstract

Cocoa trees which have been damaged by the larvae of Pantorhytes or of longicorns often get a disease called Phytophthora bark canker. If this disease is not treated, it may kill the tree, especially if it is older than 12-15 years. The recommended insecticide mixture for control of longicorns is a 1.5 % solution of dichlorvos or fenthion in 25 % white oil. Instructions for mixing this solution are given in Entomology Bulletins: No. 3 on pages 200-202 of HARVEST 5 (3).