272 



The next morning a lady residing near Newark informed me that the 

 Eose Chafers were destroying her roses. I made up my mind that I 

 would not give up the fight without at least another effort, and, pre- 

 paring a supply of kerosene emulsion, gave the rose bushes a thorough 

 spraying, using at the rate of one part of emulsion to nine parts of water. 

 As soon as the spray struck the insects many of them released their 

 hold and fell to the ground. The application was made just at evening, 

 and the next day 1 found many dead insects upon the ground under- 

 neath the bushes. There were numerous Rose Chafers upon the roses 

 at this time, but to all appearance they had come upon them after the 

 application of the emulsion. The same evening I applied the emulsion 

 upon some infested rose bushes in my own garden, and afterwards 

 picked a number of the roses upon which were a large number of the 

 insects and placed them in a well- ventilated breeding cage, The next 

 morning every bug was found to have been killed by the treatment* 

 Of course the treatment would probably have to be repeated every 

 day for some days in order to destroy the insects that had just hatched 

 out or had come from some other feeding ground. 



From my experience with the Rose Chafer I feel very confident that 

 it can be controlled by the use of the kerosene emulsion. I have 

 planned for the coming season an experiment to compare the ef&cacy 

 of the emulsion and the new insecticide Zomonia. 



Several persons have informed me that they have noticed large num- 

 bers of dead Rose Chafers upon the ground under Ailanthus and Linden 

 trees when the trees were in full bloom. From this fact they con- 

 cluded that there was something about the blossoms that poisoned the 

 insects. I thought it possible that the Ailanthus blossom might con- 

 tain something that would prove valuable as an insecticide ; but know- 

 ing that the Linden was the source of our finest honey, I was some- 

 what puzzled to account for the death of the insects. Alter carefully 

 watching an Ailanthus tree that was located near the college campus, 

 I found that the blossoms were frequented by large numbers of insects 

 of different species, the most numerous of which were the soldier bee- 

 tles, ChauUognathus pennsylvanicus, none of which were injuriously 

 affected. 



After considerable study, I arrived at the conclusion that the Rose 

 Chafers were attracted by the blossoms and fed upon them until the 

 females were ready to enter the soil to deposit their eggs, and the males, 

 dying a natural death, dropped from the trees. Unfortunately I did 

 not have the opportunity to visit Ailanthus trees while in bloom in lo- 

 calities where the insects were abundant, and consequently was un- 

 able to verify my conclusion. 



My work the past season with remedies for the Codling Moth has 

 been confined to a comparison of the efficacy of London purple and 

 Paris green. The experiment was conducted in a large apple orchard 

 belonging to the Randolph Peter's Nursery Company, located about 2 



