Abstract
AbstractEpizootiological studies of a Nosema sp. in field populations of the grasshopper Chorthippus curtipennis (Harris) were conducted in Madison County, Montana. The average density and percentage prevalence for each modal stage are reported for two sites from 1986 through 1990. Alternating high and low densities of C. curtipennis were observed during even and odd years, respectively. Prevalence of Nosema in C. curtipennis during a high density year was characterized by an increase in prevalence during nymphal development. Furthermore, prevalence of Nosema in C. curtipennis was positively related to host density, suggesting some form of density-dependent transmission.
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