49 



NOTES ON (1) THE PERIODICAL CICADA IN WEST VIRGINIA; 

 (2) THE HESSIAN FLY; (3) THE GRAPE CURCULIO. 



By A. D. Hopkins, Morgantoicn, W. Va. 



[Withdrawn for publication elsewhere.] 



Mr. Ehrhoru wanted to know if the parasite of the Hessian fly was 

 abundant in West Virginia, and stated that these parasites did not 

 exist in California, and that he desired to obtain some material in the 

 hope of establishing it in his section. 



Mr. Hopkins replied that these parasites were very abundant last 

 3^ear, but not effective. 



Then Mr. Felt presented the following paper: 



FURTHER NOTES ON CRUDE PETROLEUM AND OTHER INSECT- 

 ICIDES. 



By E. P. Felt, Alhanij, N. Y. 



A x^reliminary ^-^^qy on some work along these lines was read by 

 the writer at our last meeting and a full account of the experiments 

 in 1900 has been presented in his report for that year, and the results 

 there set forth need no repetition at this time. No very apparent dif- 

 ferences among the trees experimented upon, aside from those 

 recorded during 1900, were observable in the spring of 1901. All the 

 trees passed the winter about equally well, after making due allow- 

 ance for their condition, and though several trees died, it was only 

 those which were in a desperate condition the preceding autumn. It 

 is rather significant that of the three trees sprayed Avith undiluted 

 kerosene in the spring of 1900, but one was alive a year later, and of 

 the four treated with undiluted petroleum, but two were alive, and 

 both of these came through the winter with a large proportion (25 to 

 50 per cent) of their branches dead. It is but just to add that most 

 of these trees, as previously recorded, were at the outset very badly 

 infested with San Jose scale. 



The poor results obtained with spring applications of kerosene and 

 mechanical emulsions of the same led to the concentration of the work 

 on the more promising insecticides, namely, crude petroleum and 

 whale-oil soap in various combinations. 



Another test Avas made with undiluted crude petroleum. Some oil 

 was sent me direct from the Frank Oil Company, Titusville, Pa. It 

 was a light amber-colored oil, said to test from 44° to 45° on the 

 Beaume oil scale, and in the field, just before spraying and at a tem- 

 perature of about 65° F., it gave a reading of 43.3° Beaume. Two 

 trees were spraj^ed April 11, 1901, with this oil. The day was bright 



11823— No. 31—01 4 



