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Susceptibility in immature stages of melanoplus sanguinipes orthoptera acrididae to nosema cuneatum microsporida nosematidae and its effect on host fecundity



Susceptibility in immature stages of melanoplus sanguinipes orthoptera acrididae to nosema cuneatum microsporida nosematidae and its effect on host fecundity



Canadian Entomologist 118(1): 29-36



Second- and 3rd-instar nymphs of Melanoplus sanguinipes (Fab.) were more susceptible to Nosema cuneatum Henry infection than were 5th-instar nymphs. Lethal times were significantly lower for 2nd- and 3rd-instar nymphs inoculated with 1.0 .times. 106 and 104 N. cuneatum spores/individual than for similarly treated 5th-instar nymphs and much higher percentage of the latter were uninfected at the end of the experimental period (40-60 days post-inoculation). Fifth-instar nymphs inoculated with 1.0 .times. 106 spores/individual showed reduced adult longevity. The number of eggs laid per female was not significantly different for inoculated or untreated 5th-instar nymphs. However, the dry weights of eggs laid by inoculated grasshoppers were significantly lower and fewer eggs hatched than for those laid by untreated grasshoppers. Twenty to 30% of the progeny from inoculated 5th-instar nymphs had detectable levels of N. cuneatum sporoblasts and spores.

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