354 



mixtures of Strobane, toxaphene, endrin and Sevin with methyl parathion were 

 effective against the bollworm. Methyl parathion and a mixture of Strobane- 

 methyl parathion were the most effective insecticides tested against the tobacco 

 budworm. Much greater dosages were required, however, to kill tobacco budworms 

 than were needed to kill comparable numbers of bollworms. In fact, when DDT was 

 added to mixtures containing chlorinated camphenes and methyl parathion, the 

 resultant three-way mixtures killed fewer bollworms and tobacco budworms than 

 did two-way mixtures of chlorinated camphene and methyl parathion without DDT. 

 The most effective materials tested against boll weevils were the organophos- 

 phorus insecticides, Guthion, methyl parathion, Azodrin, Trithion and malathion. 

 Sevin, a carbamate, also provided satisfactory control. The chlorinated hydro- 

 carbons were the least effective materials tested against the boll weevils. 



695. , and Adkisson, P. L. 1969. Effects of simulated rain and dew on the 

 toxicity of certain ultra-low-volume insecticidal spray formulations. J. 

 Econ. Entomol. 62: 71-73. 

 The effects of simulated rain and dew on the toxicity of ULV sprays of certain 

 insecticide formulations to the bollworm, Heliothis zea (Boddie) , and boll 

 weevil, Anthonomus grandis Boheman, were investigated. Formulations compared 

 with Azodrin® (3-hydroxy-N-methyl- cis- crotonacide dimethyl phosphate, 5 lb/gal 

 water miscible), Azodrin (4.8 lb/gal low-volume concentrate), azinphosmethyl 

 . lb/gal EC), azinphomethyl (2 lb/gal ULV), methyl parathion (80% T) , methyl 

 parathion (4 lb/gal ECO, malathion (96.5% T) , and Strobane® (terpene poly- 

 chlorinates, 65% chlorine) + methyl parathion (4 lb + 4 lb/gal EC). Results 

 indicate that ULV sprays of water-miscible formulations were less toxic to 

 the bollworm and boll weevil than immiscible formulations when subjected to 

 rain and dew. Certain additives showed promise for enhancing the resistance 

 to rain of an Azodrin formulation. 



