Invasive Species Compendium

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Abstract

Effects of temperature and humidity on the susceptibility of Paropsis charybdis to Beauveria bassiana.

Abstract

The effect of relative humidity on the pathogenicity of the fungus B. bassiana to the Eucalyptus tortoise beetle. P. charybdis was examined using saturated salt solutions to maintain the constant relative humidity (RH) at 25°C. An RH of 92.5% had no effect on mortality compared to 100% RH. However, RH of 53, 75.5 and 85% increased the time taken to kill and reduce the overall mortality. Lower humidities encouraged more fungal sporulation on cadavers compared to those killed at a constant 100% RH. The fungus was pathogenic at all temperatures tested (15-30°C). The temperature altered the LT50 significantly, with the lowest LT50 of 2.5 days at 25°C.