10 
BULLETIN 1439, U. S. DEPARTMENT OF AGRICULTURE 
the arsenate-of-lead mixture in the spray tank. The weather at the 
time of spraying was partly cloudy to cloudy and the temperature 
65° F. This material spread well over the surface of the foliage 
sprayed except the new growth on white oak; as a spreader it was 
Fig. 7. — Appearance of foliage in plot at Watchung Ridge sprayed with mixture containing case- 
in as adhesive. A, foliage shortly after application of spray, June 6, 1924; B, foliage on September 
17, 1924 
not so good as soap, but somewhat better than any of the other 
materials used (fig. 7). 
The lead oleate, as has been stated, was a combination in paste 
form of lead oleate and lead arsenate; it was mixed with a small quan- 
Fig. 8. — Appearance of foliage in plot at Watchung Ridge, sprayed with mixture containing lead 
oleate as adhesive. A, foliage shortly after application of spray, June 7, 1924; B, foliage on Septem- 
ber 17, 1924 
tity of water before being added to the mixture in the spray tank. 
The day of spraying was partly cloudy, with a temperature of 65° 
to 70° F. The liquid spread fairly well over the foliage, but was not 
quite so good in this respect as mixtures containing as adhesives 
the proprietary casein and the soap (fig. 8). 
