Potatoes : There was some feeding in all plots by the Colorado potato beetle in both 

 years. Hopperburn was more severe in all of the lighted than in the check plots in both 

 years, with the difference being much greater in the dry year of 1959. 



Sweet corn : In the early planted corn in 1958 there was little or no infestation of 

 either the European corn borer or the corn earworm. In 1959 the early corn -was infested 

 by both of these insects, with the corn in the check plots having a significantly higher 

 number of ears infested than did that in the lighted plots. In the late-planted sweet 

 corn (harvested Sept. 19) in 1958, the number of ears infested by both the European 

 corn borer and the corn earworm was significantly higher in the check than in the lighted 

 plots. In 1959 (corn harvested Sept. 22), the number of ears infested by the corn borer 

 was significantly higher in the check than in the lighted plots, but all ears in all plots 

 were infested by the corn earworm. The population of corn earworms was higher in 1959 

 than in any year since 1938. 



Tomatoes : The percent of plants infested in 1958 and 1959 which were infested by 

 the tobacco and tomato hornworms is shown below: 



Treatment 



Check (Unlighted) 



1 15- W BL lamp 



1 15-WBLt 1 15-W green 



3 15-W BL 



Percent Plants Infested 



1958 



1959 



31 



84 



4 



34 



3 



19 







26 



In addition to the defoliation of the plants, the fruit in the check plots was severely 

 damaged in 1959. 



SUMMARY OF INFORMAL DISCUSSIONS 



During the discussions following the presentation of prepared paper s, many interest- 

 ing ideas were expressed and pertinent suggestions made. The following is a brief 

 summary of the more important of these ideas and suggestions. 



It was emphasized that there -were many difficulties in attempting to conduct precise 

 scientific research using commercially available lamps. (1) No commercial lamp radi- 

 ates at just one narrow band of frequencies, although the radiation in a relatively narrow 

 band may predominate. Most lamps have some radiation in both the ultraviolet and the 

 infrared although the radiation at the extreme frequencies may be quite small. (2) The 

 nominal colors of commercial lamps are not an adequate characterization of such lamps 

 for purposes of scientific research involving the differential insect responses because 

 lamps from different manufacturers listed under the same color may vary considerably 

 in the distribution of their radiation between frequencies. (3) Lamps from different manu- 

 facturers may respond differently to variations in line voltage. 



The need for good control of voltage applied to lamps used in research was also 

 emphasized and acknowledged as a rather difficult problem in many field studies. On 

 the other hand, it was pointed out by representatives of industry that the research 

 laboratories of commercial companies frequently had unpublicized experimental, semi- 

 experimental or even low volume, little advertised commercial devices -which might be 

 very useful tools for public agency research projects. There is need for better com- 

 munication between the two groups. 



53 



