20 



as a means of quality control is verified, but the utility of this approach 

 requires the long-term accumulation of such iiiforzoation prior to its applica- 

 tion. 



33. Barfield, C. S.; Bottrell, D. G.; and Smith, J. W., Jr. 1977. Influence 

 of temperature on oviposition and adult longevity of Bracon mellltor 

 reared on boll weevils. Environ. Entomol. 6: 133-137. 



Adults of thf parasite Bracon mellitor Say were held under constant temperatures 

 (15.6, 21.1, 26.7, 32.2 and 37.8''C), day/night temperature extremes (37.8/15.6°C 

 and 32.2/21.1°C) and 2 regimes simulating field temperatues. Daily oviposition 

 and mortality data were collected and used to calculate "capacity for increase" 

 (r,,), net reproductive rate (R^) , mean generation time (T ) and finite rate of 



c O G 



natural increase (A). Values of r increased with temperatues from 15.6~32.2°C, 

 then rapidly fell to zero as no adults survived to oviposit at 37.8'*C. The 

 large increase observed between 15.6 and 21.1'*C was evidence for a minimum thres- 

 hold efi'ect. Generally, r was not significantly higher at variable temperatues, 

 and a maximum r value of 0.26 occurred at a constant temperature of 32.2''C and 

 under one of the field simulations. Adult longevity decreased with increasing 

 temperature from a mean of 99.2 days at 15.6''C to a mean of 7 days at 37.8°C. 

 Females lived shorter lives under the variable temperature regimes. 



34. Bariola, L. A., and Lindquist, D. A. 1970. Longevity and fecundity of 

 boll weevils exposed to sublethal doses of systemic insecticides. J. 

 Econ. Entomol. 63: 527-530. 



Four systemic insecticides, disulfoton, dicrotophos, monocrotophos, and 

 aldlcarb were evaluated for their effect on the longevity and fecundity 

 of Anthonomus grand is Boheman. Weevils were exposed continuously to 2 

 treated substrates: (1) filter paper treated with the toxicants and (2) 

 excised cotton leaves that had taken up known amounts of the toxicants through 



