New York Agricultural Experiment Station. 



283 



Table XVII — ConUnucd 



Trees. 



Number 

 tieateii. 



Kiuda. 



Bartlett. 



Degn-e of infesta- 

 tion. 



2 extensively, 

 4 moderately 

 and 2 slightly 

 Infested. 



strength 

 <f g.is. 



Gram. 

 0.25 



Time of 

 treat- 

 ment. 



1 hour 



Bartlett. 



Bartlett. 



Peach: 



4 extensively 0.30 % hour 



and 3 moder- 

 ately infested, 

 extensively 

 and 5 moder- 

 ately infested. 



0.30 Ihour 



1 Var. unknown. Slightly infested 0.18 % hour 



1 Var. unknown. 

 1 Var. unknown. 

 1 Var. unknown. 



Slightly infested 0.18 Ihour 

 Slightly infested 0.30 V2 hour 

 Slightly infested 0.30 Ihour 



Resnlts. 



Scales 

 ently a 

 but ma 

 ones f 

 Trees 

 jured. 



Scales 

 Trees 

 jured. 



Scales 

 Trees 

 jured. 



appar- 

 ffected 

 uy live 

 u n d . 

 unin- 



dead. 

 u n i u - 



dead, 

 u n i n - 



Scales not af- 

 fected. Tree 

 uninjured. 



Tree dead. 



Tree dead. 



Tree dead. 



The results in these experiments were unexpected. Neither 

 the .18 gram or .25 gram had any appreciable effect. The live 

 scales were as numerous and active on the treated trees as on 

 the checks. There was a decided difference, however, in the 

 trees treated with the .3 gram. The scales were dead on all the 

 trees. The peaches, although in fairly good condition, suc- 

 cumbed quickly to the gas. The limited number of peach trees 

 used makes a repetition of the experiment desirable. 



ORCHARD VI : PLUMS. 



This orchard consists of 22 plum trees, European varieties, 

 which were set out about ten years ago. They have been well 

 cared for and have been in thriving condition until recently when 

 they began to show the effects of the San Jos^ scale. When the 

 experiments were begun they were all extensively infested and 

 hence weakened by the scale. The treatment and results in this 

 orchard are shown in Table XVIII. 



