\ / '' 



322 ^ 



of the control program. ' 



623. Meisch, M. V.; Nemec, S. J.; and Adkisson, P. L. 1972. Effects of tempera- 

 ture and photoperiod on the toxicity of azinphosmethyl and malathion to 

 the boll weevil. J. Econ. Entomol. 65: 1021-1023. 



Toxicities of ultra-low-volume sprays of azinphosmethyl and malathion to Anthonomus 



grandis Boheman were evaluated under various photoperiods and temperatures. Weevils 



were exposed to insecticide-treated plants and held in 6 test environments: SCF in 



continuous light (LL) ; 80°F and a photoperiod of LD 10:14 (i.e., 10 hours of light 



and 14 hours of dark per 24-hour cycle) ; 62-80"? truncated temperature change in 



LD 10:14; 62-80°F gradual temperature change in LD 10:14; 62"? in LL; and 62°F in \ 



LD 10:14. Toxicity produced by both insecticides showed a positive temperature 



coefficient as greater weevil mortalities occurred at higher temperatures than at 



lower. Azinphosmethyl killed greater percentages of weevils than malathion in 



the warmer temperature regimens of 80"? in LL, 80"? in LD 10:14, and 62-80''F 



truncated temperature change in LD 10:14. Malathion was more toxic to weevils 



than azinphosmethyl in the cooler temperature regimens of 62°F to 80°F in LD 10:14 



gradual temperature change. Whereas temperature exerted an obvious influence on 



the toxicities of malathion and azinphosmethyl to boll weevils, no apparent effects 



were due to photoperiodism. — 



624. Merkl, M. E. 1976. Postexperiment developments of the Pilot Boll Weevil 

 Eradication Experiment. Iri Boll Weevil Suppression, Management, and 

 Elimination Technology. Proc. of a Conference, February 13-15, 1974, 

 Memphis, Tennessee. U.S. Agric. Res. Serv. [Rep.] ARS-S-71, pp. 119-121. 



Two potential problems associated with the sterile-male release were: (1) Release 

 of about 2% females from errors in sexing, and (2) release of insects that were 

 not totally sterile. Field 43 (3 acres, zone I, unit 1), located about 2 mi west 

 of Angle, La., showed the results of the interaction of these two problems. On 



