Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Ant fauna, pest damage and yield in relation to the density of weeds in coconut sites in Zanzibar, Tanzania.

Abstract

Oecophylla longinoda attacks the coconut pest Pseudotheraptus wayi. Pheidole megacephala is the most important enemy of O. longinoda. After the end of weed control in a coconut (Malayan Red Dwarf and Cameron Red Dwarf) plantation in Tanzania, the number of palms colonized by O. longinoda increased from 696 trees in April 1991 to 1776 palms in April 1992 because P. megacephala stopped attacking O. longinoda and started to forage on the weeds and bushes on the ground. From September 1991 until October 1992, 60 068 nuts were harvested. The control of P. megacephala with hydramethylnon (Amdro) in a neighbouring plot of the same size was less effective because the initial colonization by O. longinoda in the plot was much lower. These palms produced 28 413 nuts less. It is concluded that reduced weed control can enhance O. longinoda populations.