)- 



77 



3515, MC-3815, and MC-4158; Shell SD-24052 and SD-25735 were more toxic to 

 the tvo-spotted spider mite than equvalent sprays of malathion. Also, Mobil 

 MC-38;5 and Shell SD-24908 (1 ppm) were more toxic as systemics against this 

 mite than demeton. The lowest LDj.^ for methyl parathion against tobacco bud- 

 worm collected from cotton near Brownsville has decreased steadily since 1970. 

 The highest LD-^ has been variable from year to year. In 1971, the high and 

 low LDcq's were about equal; there was about a 35X difference in 1972. 



139. , and Wolfenbarger, D. A. 1973. New compounds showing selective 

 activity against the tobacco budworm and other lepidopteran species, the 

 boll weevil and the two-spotted spider mite. J. Econ. Entomol. 66: 527-529. 



Among the different types of compounds, we found considerable selective 

 activity. The pyrethroids showed the greatest activity against the 3 

 lepidopteran species; the 2-hydroxy-3-biphenylcarboxanilides showed the 

 greatest activity against the twospotted spider mite, and only MON-0856 

 was active against the boll weevil. 



140. Cargill, R. L., and Wright, B. W. 1975. A new fragmentation reaction 

 and its application to the synthesis of (±)-grandisol. J. Org. Chem. 

 AG: 120-122. 



Grandisol (1), a component of the pheromone released by the male boll weevil, 

 Anthonomus grand is Boheman, has been synthesized by a variety of routes. We 

 report here a convenient synthesis of racemic 1 that involves a novel frag- 

 mentation of an ozonide. 



141. Carter, F. L., and Phillips, J. R. 1973. Diapause in the boll weevil, 

 Anthonomus grandis Boheman, as related to fruiting activity in the 

 cotton plant. Arkansas Acad. Sci. Proc. XXVII: 16-20. 



Studies in Arkansas show that boll weevil diapause is related to changes in 

 fruiting activity of the cotton plant. Generally, when larval development 



