Some Biological Variations Between Strains of Resistant and Susceptible House Flies

Abstract

With 6 susceptible and 2 resistant strains of house flies, Musca domestica, comparisons were made of egg viability, length of larval life, and number of adult flies obtained from 500 eggs. No differences between strains attributable to resistance were noted. Flies grown under crowded conditions developed into smaller and somewhat weaker insects than those reared normally. However, the smaller insects from a resistant colony grown under crowded conditions were far more resistant than insects from a susceptible strain that were reared under standard conditions.