PROCEEDINGS OF THE ANNUAL MEETING. 343 



«ide by side, and thus far dcndrolene has killed a few trees and appar- 

 ently injured some others, while the trees treated with the German pro- 

 duct have yet shown but little injury. Other experimenters have recently 

 reported the killing of young apple, cherry, and peach trees by treating 

 them as directed with dendrolene. It would thus be well for peach- 

 growers to wait until these substances have received the unqualified 

 Approval of several experiment stations before using them, especially on 

 voung trees. 



The greatest trouble with most of the washes recommended for borers 

 is that they do not remain on long enough as a complete coating. The 

 proper time to applj- washes for the peach borer, in the latitude of central 

 New York, is about Julv 1; and they should retain their effectiveness for 

 at least a month. Vs'a hope our extensive experiment will result in our 

 being able to recommend some easier method of combating the peach 

 borer than digging it out ; but, even though we fail in this, we shall feel 

 repaid for our work if we can show conclusively that many of the things 

 so often recommended are worthless and should not be applied. At 

 present we can only say that the '' digging out " process is the surest, 

 easiest, and most practicable method we can recommend. I find that the 

 best time to dig out the borers is in the latter jjart of June, in our latitude. 

 If it is attempted much earlier than this in the spring, or later in the fall, 

 the borers are so small that many are missed. One thorough digging out 

 in June, when they are about three fourths grown and easily found, will 

 be more effective than both a spring and a fall examination together. 



In this address I have attempted to bring together some of the later 

 results attained in our warfare agaiust the insect enemies of the horticul- 

 turist. I have tried to show that much is being done along this line, that 

 much remains to be done, and that the horticulturist and economic 

 entomologist must necessarily work together, one contributing the indis- 

 pensable scientific knowledge to be supplemented by the practical ideas 

 of the other. Some have doubtless come here expecting to learn some- 

 thing about the insects that have bothered them during the past year. 

 Were I addressing a New York audience, I would include a discussion 

 of the insects that have troubled us there in 1896, but it doubtless not 

 often happens that tlie same insects are especially destructive in Michigan 

 and New York the same year. I must, therefore, leave this phase of the 

 subject, allowing it to develop itself in the form of questions from those 

 int( rested. 



DISCUSSION. 



Responding to a question about peach-root aphis, Prof. Slingerland 

 said: These lice work in two ways. You sometimes find them on the 

 branches and sometimes on the leaves, this same insect, some of them 

 having worked up and bred on the leaves. In the fall the.y will come down 

 and breed on the roots, but they will also breed on the roots the .year 

 round. It is one of those insects that I have spoken about, and it is one 

 of these underground fellows that you can not readily reach. The only 

 recommendafion that I can make, and the one that is made by those who 

 have studied the insect (I am sorry to say that I do not know of any 

 careful, accurate experiments against it — I do not know that any have 



