290 



554. ; Llcyd, E. P.; and Bartlett, A. C. 1968. Diapause in crosses of a 

 laboratory and a wild strain of boll weevils. J. Eccn. Entomol. 61: 

 163-166. . . 



A strain of boll weevils, Anthonomus grand is Boheman, with a high ability (more 

 than 35%) to diapause (M) was crossed in the laboratory with a strain (S) with a 

 low ability (less than 5%) to diapause. Analysis of data from the 2 strains and 

 progeny from the reciprocal parental crosses showed 3 statistically different 

 sets of percentages of diapause: the M strain had a high percentage; the S 

 strain had a low percentage; and the reciprocal F^ progeny had percentages 

 approaching that of the S strain. When the pure strain, F2» and backcross pro- 

 geny were exposed to diapause- inducing stimuli, the means of the percentage of 

 weevils attaining diapause fell into 4 statistical sets: the M strain, the back- 

 crosses to the M strain and the F» from (S x M) x (S x M) , the F„ from (M x S) 

 X (M X S) which was not significantly different from the least responsive M 

 backcross and the most responsive S backcross, and the backcrosses to the S 

 strain. The percentages of diapause attained by the backcrosses to the S strain 

 were not significantly different from those of the S strain. These results indi- 

 cated partial dominance and possible simple inheritance of alleles that suppress 

 diapause in the S strain. The use of insects genetically incapable of attaining 

 diapause for a sterile- insect-release program would minimize concern that some 

 released insects might not be sterilized because nondiapausing insects could 

 not survive the winter and their matings to wild weevils would greatly reduce 

 the ability of progeny to attain diapause. 



555. , and Wright, J. E. 1979. Evaluation of bisazir and penfluron as 



sterilants for the boll weevil. Southwest. Entomol. 4: 209-215. 

 Adult boll weevils, Anthonomus grand is Boheman, of defined ages of 1, 2, 3, 4, 

 5, 6 and 10 days were fumigated with bisazir (P, P^bis (l-aziridinyl)-N-methyl- 

 phosphinothioic amide) at atmospheric pressure for 30, 60, 90, 120, and 180 min. 



