Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Ecological studies on the tea leafroller, Caloptilia theivora.

Abstract

Light trap studies on the gracillariid Caloptilia theivora in Shizuoka, Japan, in 1968 and 1969 showed there were up to 6 generations a year. Females formed 60-70% of the catch, and catches were highest between 20.00 and 22.00 h. Eggs were laid only on the flushes, mainly the 1st and 2nd upper leaves. Oviposition was related to captures in light traps. Newly hatched larvae entered the leaves through the lower epidermis. The 1st- and 2nd-instar larvae were sap feeders, and at the 3rd-instar larvae tissue feeding began. Fourth-instar larvae emerged from the mines and moved to the tips of the leaves which they formed into triangular rolls. Faeces accumulated in the rolled leaves and reduced the quality of the tea.