48 



were regfarded as badl\' infested, and on several others scattering" 

 scales were seen. None of the trees had been noticeably injured 

 even by the strong"ost spray, if exception be made of a small spot of 

 deadened bark on a sing;le tree which mig-ht possibly have been 

 due to it. In the section treated with 40 per cent, of kerosene 

 scarcely a scale escaped, and even where 25 per cent, was used the 

 treatment was ver}- effective. 



.1/ \f:c Bosto)!. — December 22, 1*)00, in an orchard belong-ing- 

 to W. Esley, near New Boston, in Mercer count}', both apple- and 

 peach-trees were found g-enerally infested, some of the former be- 

 ing" practically incrusted. December 24 28 this orchard was 

 pruned and prepared for spraying- by Mr. Green. December 2^> 

 and .U, 2.^'> trees were treated with a 20 per cent, emulsion of kero- 

 sene, the 2^Hh being very cold, clear, and brig-ht, and the 31st cold 

 and dull. Part of the peach-trees were pruned as a preparation for 

 treatment and were then thoroug-hly sprayed, but another lot of 

 peaches, not known to be infested, were pruned slightly or not at 

 all previous to the insecticide spray. January 17, 1902, an inspec- 

 tion by Mr. Rraucher showed that ten of the thirteen small peach- 

 trees which had been pruned were dead and another badly injured, 

 while the adjacent lot, not pruned, were not reported as injured at 

 all. Of the 75 young- apple-trees generally and badly infested 

 which had been treated December 2^, 20 were dead and 10 were 

 badlv injured, and on 2b there were still small numbers of living 

 scales. Ten-year-old apple-trees sprayed December 31 were not in- 

 jured, neither were cherry, pear, and plum sprayed at the same time. 



No explanation of this extraordinary- occurrence can be sug- 

 g-estcd. The oil, althoug-h bought locally, was said to be of the 

 same brand and g-rade as that used elsewhere without injury, and 

 the troatmetit was not peculiar in any discernible particular. On 

 this account, even more than if a satisfactory explanation were 

 forthcoming-, the occurrence suggested caution in the use of the 

 kerosene emulsion, and Mr. Brauchers report was followed at once, 

 as already stated, bv orders to substitute whale-oil soap for the 

 emulsion in all our Held work. 



Kerosene Emuhion at Qiiinrv. — Two other cases of apparent 

 injury to trees by kerosene emulsion occurred in the fall of 1*HH"» at 

 Ouiucy. 



No. 1. In ail orchard mainly of peach-trees, belonging^ to Mr. 

 Gustav Klarner, 7 trees were found October 3, l^'OO. infested with 

 the San Jose scale, and were destroyed with the owner's consent 

 November 8. Mr. Klarner wished to be sure that no scale re- 

 mained on his place, and in view of the probability that other trees 



