S7 



bodies of the insects. The per cent of scale killed hy the treatment 

 was carefull_y estimated at from 55 to 60. 



Examinations of these trees at different times during July and August 

 revealed that the scales were gradually becoming less and less instead 

 of more numerous, as would have been expected from the large per 

 cent of adult insects that had escaped treatment. B3^the first week in 

 July the over-wintering females were practicall}^ all dead, having given 

 birth to their j^oung. The young larvte to a considerable extent failed 

 to permanently establish themselves, and practically ab of those which 

 had settled soon afterwards died. Only here and there could a live 

 maturing insect be found, and these were mostly on the terminal 

 growth. By the middle of August the old scales were peeling from 

 the trunks and branches, and on September 6, the date of last exami- 

 nation, the trees were noticeably brighter and smoother, owing to the 

 general falling off of the dead scales. But comparatively few live 

 scales could be found, although these same trees were alive with the 

 crawling larvae in June. 



Experiment IT. — This test was made at Annapolis Junction on 225 

 10-year-old apple trees and about 50 2-year-old peach trees. The 

 wash was applied March 27 and 28. An examination on June 13, 

 about two and one-half months later, showed young, crawling lice in 

 great abundance, and the mature l)reeding females were so numerous 

 that ))ut little good appeared to have been accomplished by the treat- 

 ment. The percentage of scales killed was placed at from -15 to 50. 



This orchard was not examined again until September S. Instead 

 of finding these trees badly infested with scale they were found to be 

 remarkabl}' clean. Live scales were really hard to find even this late 

 in the season. The old scales had largely shelled ofi' and the trunks 

 and limbs had taken on a slick, health}- appearance. Even on trees 

 that had been encrusted with scales the results were apparently equally 

 good. 



The final outcome of these tests of the wash was cpiite a surprise. 

 It would appear that results have been expected too soon after the 

 application of the wash, and it further appears, as has recently been 

 shown l)y Mally " in the case of Dn/sp/'s pentf/goini, that a suflicient 

 amount of the wash probal)l3^ remains on the trunks and limbs to 

 destroy the larvffi coming from those females which escaped the treat- 

 ment. The final effect of the wash in the two cases cited and in other 

 cases that have come under my observation leads me to believe that 

 we have a most valuable treatment for the San Jose scale in the lime, 

 sulphur, and salt wash. 



« Entomological News, vol. 13, p. 223. 



