Genetics of the Encephalitis Vector, 'Culex Tarsalis' for Possible Application in Integrated Control.

A resume of progress for the year 1977-78 is as follows. The number of maintained strains for genetic studies was increased Multiple-marker strains for genetic studies and identification of translocations increased to 8. Three new mutants were isolated Among the translocation strains that show promise are 2 sex-linked, 3 autosomal. Two sex-linked are multiples, involving all chromosomes. Two autosomes are in homozygous condition A sex-linked multiple translocation strain was studied for competitiveness in laboratory and large-outdoor cages A new method for isolating heterozygotes and homozygotes was devised A pilot release study was carried out at isolated sites in Kern County Population dynamics studies on native and release immatures were completed Mark-release-recapture studies were carried on throughout the spring and summer Computer models were used to determine number of males to be released this spring in 2nd pilot study and In vector competence studies, a refractory strain was successfully selected. Genetic studies determined that susceptibility to WEE virus was dominant and controlled by more than 1 gene.