Abstract
The highest percentage of larvae of the Clear Lake gnat, Chaoborus astictopus, with apparent infections was collected from an overwintering population when the temperature of the water was low and the larvae were exposed to the pathogen, Thelohania corethrae, for the longest time. The youngest larvae observed with patent infections were in the early third instar. It was observed that the highest mortality of infected larvae occurs just before or during pupation; adults emerged from heavily infected pupae are weak and not capable of flying. It was determined that sporogony of T. corethrae is not sex-specific and develops equally well in both sexes. T. corethrae is transovarially transmitted and the apparent infections were observed in 16- to 24-day-old third-instar larvae. The presence of infected but asymptomatic fourth-instar larvae from an overwintering population collected in the spring indicated that fourth-instar larvae can be infected perorally when spores reach a certain, but as yet undetermined, infective stage. Infectivity tests were almost totally negative.
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