26 BULLETIN 1032, U. S. DEPARTMENT OF AGEICULTUEE. 



results obtained Tvas plainly shown by the preliminary experiments 

 of 1918 previously referred to. In 1919, therefore, a comparison 

 of the kinds of spreaders was made and in these tests glue, 1 pound 

 to 200 gallons, and nicotine oleate at the strengths mentioned above 

 were checked against fish-oil soap, 2 pounds to 50 gallons. As will 

 be observed in Table 3, the use of glue gave the poorest control of 

 the three groups of plats III and IV, XI and XII, and XIII and 

 XIY. in all of which the strength of the nicotine was approximately 

 the same ; nicotine oleate was next ; and fish-oil soap, 2 to 50, gave 

 the best results. 



Observations made immediately after these spreaders were ap- 

 plied showed that glue spread tl>e solution fairly well over the old 

 foliage, but failed to carrj- it into the small, new leaves at the tip^ 

 the region of greatest activity of the young larvae; nicotine oleate 

 spread very' satisfactorily over both old and new foliage, but did not 

 seem to go as far into the unfolding buds and leaves as did the solu- 

 tion containing fish-oil soap, which, moreover, might be one reason 

 for the superior control secured where fish-oil soap was used as a 

 spreader. 



It was observed that fish-oil soap used at this strength would 

 often carry the solution containing it into the very center of the 

 group of small unfolding leaves at the tip of the upright and enable 

 the solution to find its way into the loose web of any small larvse 

 which might be working therein. 



" Phenol Compound No. 1." 



A proprietary compound used primarily- as a disinfectant and 

 containing a large amount of crude carbolic acid was tested against 

 the fireworm. This material mixes in all proportions with water, 

 making a milky white solution which gives off a strong, characteris- 

 tic carbolic-acid odor. It was used at the rate of 1 part to 500 parts 

 of water and sprayed directly into the tips of the vines, as on the other 

 plats. As will be noted in Table 3, little or no control was secured. 



DEMONSTRATION SPRAYING EXPERIMENTS. 



The results of a series of demonstration spraying experiments, 

 conducted on the bogs belonging to H. M. Williams & Sons, at 

 Ilwaco Junction, Wash., in 1919, are presented in Table 4. The ma- 

 terial found most effective in previous tests, namely, 40 per cent 

 nicotine sulphate, 1 to 800, with soap 2 to 50, was used in all these 

 experiments. 



