57 



a teTnporary permit that allows the Animal and Plant Health Inspection Service 

 to use it in survey operations. 



99. . 1979. Fate and efficacy of acephate after application to plants 



and insects. J. Agric. Food Chem. 27: 268-272. 



14 

 A sipgle foliar application of C-labeled acephate was absorbed rapidly by 



cotton leaves (>50% in 24 h) , and unabsorbed residues were essentially de- 

 pleted in 48 h. The absorbed acephate was metabolized by the leaves to small 

 amounts (ca. 9% of dose) of the insecticide methamidophos and to lesser 

 amounts (<5% combined) of at least four other products. Two of the latter 

 four products were tentatively identified as 0-S-dimethyl phosphorothioatci 

 and S-methyl acetylphosphoramidothioate. Absorbed acephate and/or its meta- 

 bolites were rapidly translocated throughout the plant including the fruit. 

 However, with normal application methods, any such translocation of toxicants 

 that might occur is apparently insufficient to kill pests that feed on new 

 growth or fruit. Acephate was considerably more toxic to third-stage tobacco 

 budworms, Heliothis virescens (F.), than to adult boll weevils, Anthonomus 

 grand is Boheman, in tests with topical applications to the insects and with 

 bioassays of treated cotton foliage. Some evidence obtained in studies of 

 the absorption and metabolism of C-labeled acephate by the two species 

 suggests that the metabolic conversion of the chemical to methamidophos in 

 tobacco budworms may contribute to the observed differences in susceptibility 

 between species. 



100. . 1980. Fate and efficacy of sulprofos against certain insects asso- 

 ciated with cotton. J. Econ. Entomol. 73: 262-264. 



Topical applications of sulprofos were ca. equally toxic to 3rd-stage larvae 

 from organophosphorus insecticide susceptible (S) and resistant (R) strains 

 (LD^Q 0.34 and 0.38 yg/insect, respectively) of the tobacco budworm, Heliothis 



/ 



