22 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 10 



The farm bureau manager is in close touch with the needs of each 

 community in his county and can give the college worker much valu- 

 able advice as to the subjects in which demonstrations are needed and 

 as to the points requiring special emphasis. Through the local com- 

 mittees of his association, he is able to have the demonstrations located 

 on the most suitable farms in each community and thus insure the 

 work being conducted in a business-like manner. Where demonstra- 

 tions are conducted as the result of a local demand and where the local 

 organization has a voice in deciding on their location, greater interest 

 is developed than where the whole program is conducted by outside 

 agencies. Furthermore, under such circumstances, the demonstra- 

 tions will be more likely to have a direct bearing on the needs of the 

 community. There is also less danger of getting a poor cooperator; 

 the local committee feels a considerable responsibility for the success 

 of the demonsti'ation and a larger number of farmers become familiar 

 with all the details of the work. 



In cooperative work of this kind, it is important that the demonstra- 

 tions should be adapted to the conditions under which the crop is 

 grown. For instance, while apples are grown more or less in every 

 county of New York state, there are certain counties in which apple 

 growing has become a specialized industry. To do effective demon- 

 stration work in the control of apple insects, this difference must be 

 kept in mind. In those counties where most of the apples are grown 

 in the small home orchard, the best results will probably be obtained 

 by showing the advantages of following a rather simple spraying sched- 

 ule. In some localities it might even be advisable to hold spraying 

 demonstrations, but only where the growers are entirely unfamiliar 

 with spraying machinery, spraying materials and methods of applica- 

 tion. Such demonstrations would be entirely out of place in the lo- 

 calities where the growing of apples is a specialized industry. Here, 

 demonstrations showing the relative value of different methods of 

 application, different insecticides or different combinations of insecti- 

 cides with fungicides would arouse greater interest and be of more 

 permanent value to the community. The same condition holds in the 

 case of potatoes. Where potatoes are not an important crop demon- 

 strations of the benefits derived from spraying for the control of blight, 

 the Colorado potato beetle and flea-beetle are all that is needed. In 

 those localities, however, where potato raising is the main industry, 

 demonstrations showing the comparative value of different forms of 

 arsenical poisons (arsenate of lead, paste or powdered; Paris Green; 

 or arsenite of soda) would be of greater benefit to the growers. In 

 other words, the subjects for demonstration should be so chosen and so 

 •conducted that they actually help the grower to fight the insect enemies 



