Comparison of the attractiveness of two [sub]species of Eucalyptus [globulus] to Phoracantha semipunctata (preliminary results).
The need to improve the efficiency of oviposition traps led to a study of the attractiveness to Phoracantha semipunctata of trap logs of Eucalyptus globulus subsp. globulus and subsp. maidenii [E. maidenii] in Portugal. Trap logs (2.2 m long) of the two taxa were placed in three areas in summer 1986, following sanitation fellings. Sets of 8 logs were placed side-by-side, with logs of each taxon being separated by 50 m. Seven incisions were made on the upper surface of each log to assist oviposition, and mechanical protection against egg predators (e.g. ants) was provided. Logs were replaced every 3 wk from August to October. Preliminary results indicated that E. globulus subsp. globulus was more attractive than E. maidenii.