9(j JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 15 



would be sufficient for all needs that may be created in time, but I 

 am convinced that the production can be greatly increased, with the 

 demand. 



Mr. H. a. Gossard: What does it cost? 



Mr. F. C. Bishopp: It costs about a dollar a pound, but perhaps it 

 could be produced considerably cheaper. 



Mr. L. O. Howard: How does this compare with pyre thrum? 



Mr. F. C. Bishopp: With nearly all of the pyrethrum group, in the 

 case of fleas at least, there is that stunning property which causes the 

 fleas to come out and drop off, while with derris we get actual des- 

 truction of them. Of course the destruction of the insect is important 

 and in that derris is very effective. 



Mr. N. F. Hon^ARD: Derris appeared to be superior to a good grade 

 of pyrethrum against the Mexican bean beetle; however, we are not 

 recommending either of these materials for practical use against this 

 insect. 



President George A. Dean: The next subject is "The Apple 

 Sucker," bv W. H. Brittain. 



THE APPLE SUCKER 



{Psyllia malt Schmidberger) 



By W. H. Brittain, Provincial Entomologist for Nova Scotia 

 Present Distribution 



The present known distribution of the apple sucker includes, Austria, 

 Caucasus, Cz echo-Slovakia, England, Ireland, Germany, the central 

 and northern part of old Russia, Norway, Sweden, Denmark, Holland 

 and lastly Nova Scotia, where its presence was first detected in 1919. 

 It has also been recorded from Japan and France, but at the present 

 time it is not known to be present or injurious in either of these countries. 

 It is apparently found as far north as the apple will grow and seems to 

 be m.ost serious and abundant throughout the northern range of its host. 



Host Plant 



The insect is recorded as breeding on the European Mountain Ash 

 (Sorbus aucuparia) and it occasionally attacks pear and more infrequent- 

 ly quince. From a practical standpoint, however, the apple may be 

 considered the sole host. The fact that it has been reported from a 

 long list of other plants is doubtless due to the habit of the adult insect 

 of seeking shelter on other trees than its real host. 



