A Comparative Study of Certain Biological Phenomena of a Resistant and a Susceptible Strain of the Boll Weevil, Anthonomus grandis1

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Abstract
Research was conducted in 1959 to determine if biological differences existed in a laboratory reared resistant and susceptible strain of the boll weevil, Anthonomus grandis Boh. The most significant differences found were an increase in the length of the developmental period and a decrease in the reproductive potential of the resistant strain. An increase of 12.5 hours in the developmental period of the resistant strain over the susceptible strain proved highly significant. The fecundity of the resistant females decreased approximately 22% below the susceptible females. Significant differences were observed in the fecundity, and the length of time required for embryonic, larval, and pupal development. No differences were observed in the mortality rates, sex ratios, length of preoviposition and oviposition periods or percentage egg hatch.