REPORT OF THE STATE ENTOMOLOGIST 1904 395 



living scale insects were observed, otherwise the treatment was 

 very satisfactory. 



Wash 7 composed of 30 pounds of lime and 15 pounds of sulfur 

 to 50 gallons of water, was prepared in the same way as wash 4, 

 except that the boiling was continued for only an hour. No dif- 

 ference between the two was detected. It was applied Ap. 13 



to rows 23 and 24. 



July 22 small numbers of living scales were detected on the 

 trees which were healthy and vigorous, and on Sep. 23 a very small 

 amount of living scale was observed, otherwise the treatment 

 was very satisfactory. 



Wash 8 composed of 30 pounds of lime and 15 pounds of sulfur 

 to 50 gallons of water, was boiled ^ hour. This wash was prepared 

 the same way as wash 3 and there was no noticeable difference. 

 It was applied to rows 19 and 20. 



July 22 no living scale insects were found and on most of the 

 trees, which were vigorous, the wash was still plainly visible. There 

 was a small amount of living scale on two nearly dead trees which 

 had not been previously treated. Sep. 23 it was seen that most 

 of the trees were very clear of the scale, except a few rough barked 

 ones, which probably sheltered some of the insects so they 

 were not hit by the application. 



Wash 9 composed of i pound of caustic soda to 6 gallons of 

 water, was prepared by simply dissolving the caustic soda in a 

 small amount of hot water, which was then diluted to the requisite 

 quantity. It proved to be very caustic and whenever any of the 

 spray fell on the hands or face, a stinging sensation was felt. This 

 solution was applied Ap. 15 to rows 16 and 17, 7 i pounds of caustic 

 soda being used to 45 gallons of water. 



July 22 the trees treated with this solution were apparently 

 quite vigorous, though there was more scale found on them than 

 on those treated with wash 11. The check row, which stands 

 next these two rows, was badly infested by scale insects and indi- 

 cations of breeding were abundant, the young being observed 

 crawling on the limbs. The leaves on the check row were markedly 

 smaller than those on the trees treated with this wash, and a num- 

 ber on the check row had turned color as if the trees were unable 

 to support the foHage. An examination Sep. 23 showed that 

 these trees were nearly as badly infested as those of the check 

 row. This undoubtedly was due in part to spreading from the 

 check row but at the same time there was abundant evidence 

 showing that this solution has comparatively little value as a de- 



