oa African Entomology - Host location and aggregation behaviour in Hylastes angustatus (Herbst) (Coleoptera: Scolytldae)
Hylastes angustatus (Herbst) is a bark beetle that is an important though sporadic pest of commercially grown Pinus species in South Africa. It usually develops in pine logs that have been felled or otherwise damaged. The adult beetles are attracted to these logs by volatile chemicals produced by the damaged tissues. Host location and aggregation behaviour of H. angustatus were investigated in the laboratory using multiple-choice trials. The beetle prefers P. elliottii to P. patula, roots to stems, high to low beetle densities and bark treated with ethanol and/or low concentrations (1 %) of monoterpenes. Hylastes angustatus appears to prefer hosts or parts of the plant with higher nutrient and moisture contents. Ethanol and low concentrations of monoterpenes are potentially useful attractants for monitoring H. angustatus populations in the field. The standard practice of replanting Pinus lots immediately after felling is not recommended.
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