37 



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

 was carefully estimated at from 55 to 'i<». 



Examinations of these trees at different times daring 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. By the first week in 

 July the over- wintering females were practically all dead, having given 

 birth to their young. The young larva? to a considerable extent failed 

 to permanently establish them-eives. and practically all of tho-e which 

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

 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 *3. 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 II — This test was made at Annapolis Junction on 225 

 lu-year-old apple tree- and about 5" 2-year-old peach trees. The 

 wash was applied March '1~ and 28. An examination on June 13, 

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

 great abundance, and the mature breeding female- were so numerous 

 that but little good appeared to have been accomplished by tin- treat- 

 ment. The percentage of scales killed was placed at from 4:5 to 5". 



This orchard was not examined again until September 8. Instead 

 of rinding these tree- badly infested with scale they were found to be 

 remarkably clean. Live scales were really hard to rind even this late 

 in the season. The old scale- had largely shelled oil' and the trunks 

 and limbs had taken on a slick, healthy appearance. Even on tree- 

 that had been encrusted witli scales the results were apparently equally 

 good. 



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

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

 application of the wash* and it further appears, a- ha- recently been 

 shown by Mally" in the case of Diaspis pentagona, that a sufficient 

 amount of the wash probably remain- on the trunks and limbs to 

 destroy the larvae coming from those female- 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 f ]^>v scale in the lime. 

 sulphur, and -alt wash. 



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



