367 



at the end of 16 h postinjection. Lysozyme activity was demonstrated In both 

 inoculated and uninoculated boll weevils. Peak lysozyme activity of 6.9 mu. 

 g/ml was found at 48 h following inoculation of heat-killed S^. marcescens . 

 Bactericidal activity was demonstrated in inoculated boll weevils but not in 

 uninoculated boll weevils. Peak bactericidal activity occurred at 24 h 

 following inoculation of heat-killed S^. marcescens . Lysozymal and bacteri- 

 cidal activities were shown to be separate functions. 



720. Parencia, C. R. , Jr. 1968. Control of cotton insects with an insect- ^ 



collecting machine. J. Econ. Entomol. 61: 274-279. 

 A total of 7950 insects representing 9 orders, 44 families, and 127 species 

 were collected in 6 samples with an insect-collecting machine; also 313 spiders 

 were collected. The cotton fleahopper, Psallus seriatus (Reuter) , was the 

 most abundant injurious insect, and the rapid plant bug, Adelphocoris rapidus 

 (Say), was second. Boll weevils, Anthonomus grandis Boheman, were collected 

 at the rate of 46 per acre, even though 1944 was not considered a "weevil" 



year. The machine collected 70% of the estimated population of boll weevils, _ 



77% of the cotton fleahopper adults, and 80% of the rapid plant bug adults 

 in first-run operations. In field-plot tests, the machine reduced populations - , 



of cotton fleahoppers and rapid plant bugs below those of the check, but d • 



f 



mixture of calcium arsentate and sulfur dust gave better control. The I 



machine could not be used when plants became large and did not compete with 



insecticides in controlling migrating cotton fleahoppers when it was operated 



on the 5- to 7-day interval used to apply the insecticides. Also, the 



machine treated only a small portion of the cotton plant. It was most efficient 



in collecting cotton fleahopper adults and boll weevils when the cotton plants 



were in the presquare stage. 



\ 



