60 



fast-release formulations that were both replaced at 2-day intervals. The 

 com'jined results of field tests at all locations, and of laboratory analyses 

 of veathered samples, suggested that a physical-barrier system might yield 

 more consistent results, but no single formulation was decidedly superior to 

 the others. Tests demonstrated also that slow-release formulations could be 

 used effectively in the different types of boll weevil traps currently in use. 



104. ; Coppedge, J. R.; Ridgway, R. L. ; Hardee, D. D.; and Graves, T. M. 

 1973. Formulations for controlling the release of synthetic pheromone 

 (grandlure) of the boll weevil. 1. Analytical studies. Environ. Entomol. 

 2: 829-835. 



Several different formulations of the synthetic pheromone (grandlure) of 

 Anthonomus grandis Boheman were prepared and tested in the laboratory and 

 field in an attempt to prolong effectiveness of attractant in traps. Of 

 those tested, two extended the effective trap life of attractant for periods 

 greater than one week: (1) a physical-barrier preparation that consisted 

 of a cigarette filter impregnated with grandlure in a solution of polyethylene 

 glycol 1000 (20.4 percent), glycerol (32.3 percent), water (12.8 percent), 

 and methanol (34.5 percent), and contained in an open one-dram galss vial; 

 and (2) a commercial gel formulation. Plastic preparations tested did not 

 improve significantly on the grandlure formulations. 



105. ; House, V. S. ; Abies, J. R.; and Morrison, R. K. 1979, Selective 

 methods for managing insect pests of cotton. J. Econ. Entomol. 72: 841-846. 



In replicated tests in small field plots of cotton, applications of a commercial 

 formulation of Bacillus thuringiensis Berliner (BT) (1121 g/ha) did not ade- 

 quately suppress heavy populations of Heliothis spp. larvae. When chlordimeform 

 (140 g/ha) was applied in conjunction with this same dose, the level of control 

 ^ increased but did not exceed that provided by chlordimeform alone. Direct com- 



