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Mating types in screwworm populations?

Response is given to questions raised by L.E. LaChance, et al., regarding the types of screwworm that occur in Mexico and anatomical differences in male genitalia among types. Errors in chromosome length and arm ratios are discussed. Results of testing the V-81 strain (sterile males) indicate that mating barriers exist even at high release rates. Mating discrimination must be high for a population to withstand an excess of sterile flies. The relevance of this to eradication programs is discussed. (RJC)