maximum attraction which is economically feasible is desired. It appears that different 

 equipment will need to be provided for these two objectives. 



In development of light traps for use in isolated locations where efficient use of input 

 power is essential, agreement is needed concerning the smallest lamp size giving a 

 sufficiently representative catch. 



ADDITIONAL FUNDAMENTAL INFORMATION NEEDED 



In considering the need for additional information concerning the effects of "intensity" 

 on insect attraction, it is obvious that more information is needed about the respective 

 effects of "brightness" and "luminous flux density." Such investigations would undoubtedly 

 have to be initiated as laboratory studies of specific insect reactions with evaluation of 

 the characteristics of the light environment required to initiate them. If the fundamental 

 reactions of attraction can be determined in this manner, then it should be possible 

 to translate these findings into field techniques to achieve greater attraction. 



Further investigation of the effect of the physical size of light sources would seem 

 to offer possibilities for increasing attraction. From present knowledge of the vision 

 of insects through their compound eyes it appears logical that source size, as well as 

 light characteristics, would affect attractance. 



There is also evidence of repulsion and immobilization 5 of insects from the effects 

 of light and the causes of these reactions should be more clearly related to factors of the 

 light environment. 



It is hoped that the foregoing has made it clear that the relations of insect attraction 

 to "intensity" of light are by no means fully understood. 



5 Wigglesworth, V. B„ The Principles of Insect Physiology, E. P. Dutton &Co„ New York, 4th. Edition, pp. 134-159, 192-206. 

 1950. 



32 



