Distribution and Population of Eucalyptus Gall Wasp in Thailand

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Atip Pamarapa
Wattanachai Tasen
Yongyut Trisurat
Simon Lawson
Madaline Healey

Abstract

The distribution and population of eucalyptus gall wasps was studied at a eucalyptus plantation under the forest industry organization and private forest plantations in Thailand. Randomized sample plots were analyzed, during the months from July to December 2019, using geographic information system (GIS) and maximum entropy (MaxEnt) on secondary data obtained from government agencies, to generate a distribution map. Two species of eucalyptus gall wasps were identified as eucalyptus gall wasp (Leptocybe invasa) and a parasitoid of eucalyptus gall wasp (Quadrastichus mendeli). The average population density ratio between the eucalyptus gall wasp and parasitoid was 2,170:19,530 per square kilometer and the percent ratio of parasitoids was 1:9, respectively, with an average parasitoid frequency of 90.00%. The efficiency values, as determined by the area under curve (AUC) from the receiver operation characteristic (ROC) model, in the area of distribution of eucalyptus and parasitoid of eucalyptus gall wasp, was 0.98 and 0.97, respectively. Environmental factors related to the distribution of eucalyptus gall wasp and parasitoid of eucalyptus gall wasp were determined as the soil series and monthly average rainfall, respectively.

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