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Field collection techniques for genera Neocurtilla and Scapteriscus mole crickets and their effect upon the evaluation of their natural pathogens in Brazil

During 1984, collections of 6 species of the genera Scapteriscus and Neocurtilla mole crickets were performed in the state of Sāo Paulo, Brazil. The 6 species differed significantly in terms of numbers of individuals manually excavated or trapped with sound, light or pitfall traps. Moreover, for all species, the frequency of fungal, microbial and nematode infections varied significantly among collection techniques. The evaluation of natural mortality factors is thus shown to rely heavily upon the behavior of each species, and care is needed to assess the relative importance of natural mortality in field populations.