150 



2S2. Graham, H. M.; Hernandez, N. S. , Jr.; Llanes, J. R.; and Tamayo, J. A. 



1978. Overwintering habitats of the boll weevil in the Lower Rio Grande 



Valley, Texas. Environ. Entomol. 7: 345-348. 

 Three yr of sampling for overwintering boll weevils, Anthonomus grand is Boheman, 

 in debris from habitats adjacent to cotton fields near Brownsville, TX showed a 

 density ranking of habitats, in descending order, of hackberry trees ( Celtis 

 laevigata Willd.), granjeno bushes (C^. pallida Torr .) , and open grassy areas. 

 However, more total weevils were found in grassy areas, which were the most 

 abundant of the habitats. Populations of overwintering weevils were lowest 

 the winter after the cotton crop had been harvested and plowed under by Aug. 31. 



283. ; Hernandez, N. S., Jr.; Llanes, J. R.; and Tamayo, J. A. 1979. 

 Seasonal incidence of diapause in boll weevil populations in the Lower 

 Rio Grande Valley of Texas. Southwest. Entomol. 4: ] 70-175. 



The first dlapausing boll weevils, Anthonomus grandis Boheman, were collected 

 from cotton plants in the lower Rio Grande Valley of Texas in mid- to late- 

 June, about the time the first open bolls appeared. The proportion of dla- 

 pausing weevils increased rapidly during July as the plants matured and then 



were defoliated. Estimated total populations of boll weevils and estimated 



<*• 



populations of diapausing weevils were greatest during a year when frequent 



" #^ 



rains hampered insecticide application, harvest, and destruction of crop 



residue. 



284. ; Wolfenbarger, D. A.; and Nosky, J. B. 1978. Labeling plants 

 and their insect fauna with rubidium. Environ. Entomol. 7: 379-383. 



Single applications of aqueous sprays of rubidium chloride (RbCl) were made at 

 rates of 0.625-10 kg/ha to cotton, grain sorghum, and hyacinth bean, Dolichos 

 lab-lab L. , to label the plants and insects on them with elevated levels of Rb. 

 However, at all rates tested there was overlapping of the concentration of Rb in 



