EEPOET OX ENTOMOLOGICAL WORK IN OREGON AM) 

 CALIFORNIA ; NOTES ON AUSTRALIAN IMPORTA- 

 TIONS. 



By Albert Koebele, Special Agent. 



LETTER OF SUBMITTAL. 



Alameda, Cal., November 8, 189S. 



Sir : I herewith submit to you my report of observations during the year. Special 

 reports ou work done in Oregon and Washington upon Phorodon humtrfi Schrank.. and 

 on the investigation of the condition of predaceous insects sent from Australia dur- 

 ing my last trip to that country, have been made and forwarded to you. I shall here 

 mention only certain additional facts connected with the same and note some other 

 observations made. 



Respectfully, yours, 



Albert Koebele. 

 C. V. Relet, 



U. S. Entomologist. 



The hop louse, as could plainly be noticed during spring, has not beeu 

 so numerous during thepresent season in Oregon and Washington, owing 

 to the increase of insects living upon it, as shown by the interesting 

 letter of September 10, 1893, from Mr. II. J. Miller, of Aurora, Oregon. 

 as follows: 



* * * The hop crop is very light, owing to cold rains in the spring and then 

 continual dry weather. In the spring when the lice emigrated to the hop the weather 

 was cold and rainy, and I noticed that the lice on the vines would turn white and 

 sickly and finally die. Xo spraying was done, as it was not necessary in this vicin- 

 ity. A few lice survived the cold weather, and just before picking time the weather 

 turned sultry, cloudy, and rainy, favorable for development of lire, and it could be 

 noticed that they increased very fastj but picking time was too elose at hand for 

 them to do any damage. 



As to collecting the lice from the plum trees. I have great faith in it. but to make 

 it successful, farmers for miles around should closely inspect their trees and free them 

 from vermin. One hop yard seemed to be infested as much as any of those o( our 

 neighbors, but as some of our nearest neighbors had plum trees and did not clean 

 them, I am sure some of the lice emigrated from their trees to our yard, for they must 

 be able to travel long distances. The ladybirds increased for a while in the spring, 

 but as the summer advanced they began to dwindle away, and at picking time were 

 getting scarce. * * * 



1193— Bull. 32 3 33 



