Am-il. '15] ENTOMOLOGISTS' PROCEEDINGS 185 



insecticide and found that it contained 2J per cent of sulphuric acid 

 and I inferred that this chemical was the cause of the injury. I re- 

 gret to state that I found it impossible to introduce sulphuric acid in 

 any of the formula with which I experimented and therefore I was 

 not able to test any formula with and without sulphuric acid. 



In regard to Scalecide, it is not so injurious to citrus fruits as Orch- 

 ard brand but it does so much damage to young fruits that it is inadvis- 

 able to use it at any time of the year. The Bureau of Chemistry found 

 that this insecticide contained much rosin or rosin oil. In other ex- 

 periments with the use of rosin and rosin oil, in every instance the same 

 formula made up with rosin oil caused much damage while the same 

 formula T\dth rosin oil omitted was absolutely harmless. I have con- 

 cluded that an insecticide for use on citrus trees should not contain 

 rosin oil. 



Target brand is fairly efficient. It contains quite a large percentage 

 of phenol Avhich my experiments show is worthless as an insecticide 

 and is more or less injurious to the trees and the fruits. It is much less 

 injurious than either of the former articles and is used quite extensively 

 throughout the state. 



Schnarr's Insecticide is also a proprietary article and does not con- 

 tain any of the above injurious chemicals and as a general proposition 

 it does no injury to fruit or trees. Neither does the Government 

 formula which contains none of these chemicals cause any damage to 

 the trees or fruits if used conservatively. Thousands of gallons of 

 these paraffin oil emulsions have been used with little or no damage. 



It is my contention that if oils containing these injurious chemicals 

 cause injury to citrus then there is also great liability that they will 

 cause injury to deciduous trees. I think it would be a matter worth 

 while to experiment with some of the cheap paraffin oil emulsions on 

 deciduous trees to determine if any injury or liability to injury would 

 foUow their use. I suppose it is generally understood that miscible 

 oils can be made from cheap lubricating oils which can be found almost 

 everywhere and cost about fifteen cents a gallon in barrel lots. 



yin. E. G. Titus: Only in the last three years have we had any 

 damage from this particular insect. At the present time, it has se- 

 riously infested some of the fruit orchards in two of our valleys. 



This year I carried on some spraying experiments and my results 

 are not as good as I expected them to be. 



The leaf-roller injures from 50 to 60 per cent; this injury was re- 

 duced to 24, 11 and 7 per cent, roughty speaking, but even 7 per cent 

 injury is too great to allow the leaf -roller and we wish to improve. If 



