laRICULTURAL APPROPRIATTOV RUA^ lf>24. 809 



Mr. Walton. Yoi*. 



Mr. Andkusox. Is it practical^ 



Mr. Walton. Yrs; it is costly, hut it can \to i\tmo. 



Mr. Andkuson. Ploa.sc t<'ll us what it is. 



Mr. Walton. liurnini; ovtw the wccil an*a.s at the time when the 

 woods aro in a dry contiition. That ran Im* (l<»ne. 



Mr. Andeijson. Arc thoso words l)urnc(l with an oil humor ^ 



Mr. Walton. Yo.s; thoy aro liuniotl with oil hurncrs. »ind thoro 

 also has to ho a liro protection to control tho fire aftor it got.s started. 



Doctor Ball. It could ho jjono if thov went at it in a commercial 

 way, hut tho dostruclion of wo«>(ls wotild ho choapor hy a chomical 

 process. Burning tho woods will often increase tho crop tin- next 

 year. If wo do it h}- chemicals it would eliminate that. 



Mr. Andkrson. Can they destroy it with chemicals^ 



Mr. Walton. Yes; sodium arsenite is used, which is very ellective. 



INFESTATION IN CANADA DANOEROU8. 



As to the Canadian condition, a very intense infestation of the 

 corn borer was discovered near St. Tliomas, in southern Ontario, 

 in 1920, and since that time this infestation continued to exist, and 

 became very much more intensified in 1921. There was very severe 

 injury to corn. Some of the flint cornfields were an entire loss. 

 Since then either the insect has spread, or the scouting work has 

 been mucli more effective, and it has been found that practically 

 the entire southern half of the Province of Ontario is infested with 

 the insect. They have the largest single area of infestation on the 

 American Continent. Tliis year the mjury in the center of that 

 area is not so great as was the case a year ago. 



Doctor Ball. They cleaned up the cornstalks over the heavily 

 infested area last year. 



Mr. Walton. They cleaned up, and the Canadians believe that a 

 large portion of that reduction of the infestation has been due to 

 delay in planting corn to a certain date, a date beyond which the 

 moths will have died off. 



They do not raise much com for grain purposes. It is largely a 

 forage crop. It is raised for silage. They can delay it when it is 

 planted for silage. \Miether or not that would be applicable to Oliio 

 and Michigan conditions remains to be seen. Probably it will not be, 

 except to a limited extent. 



POSSIBILITY OF INSKCT SPREADING ALL OVER THE UNITED STATES. 



Mr. Anderson. Have we got a prospect of getting this bug all over 

 the United States in due time? 



Mr. Walton. It looks that way, although perhaps the spread will 

 be slow. In the meantime we are bringing m the natural enemies 

 from Europe. We liberated 1,000,000 of one species in Massachu- 

 setts this summer, and several other species, wlucli promise ecjually 

 well will be liberated later on. 



Doctor Howard. We are making a more intensive study of 

 European parasites than ever before. At the laboratory in the south 

 of France they are studying the life round of every parasite. 



Mr. Anderson. Where does this com borer exist in European 

 countries ? 



