Abstract
When stocks of larvae of Pieris brassicae (Linnaeus), at least some individuals of which are naturally infected with granulosis, are subjected to an increase in population density or are exposed to high (40° C) or low (3° C) temperatures for 2 hours daily no more of the treated than of the control larvae die of granulosis. However, feeding the larae on unfamiliar food does increase the incidence of granulosis deaths among larvae of susceptible but not of resistant stocks. The practical implications of these results are considered in the discussion.
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