The Question Box. 391 



good. However, it does not pay to save five cents' worth of 

 poison. Almost any of the poisons are good and I do not care to 

 distinguish between them. 



Wliat is the name of the insect that causes the humps on apples? 



Prof. Felt. — I am free to say that I do not know what the in- 

 sect is. The only way is to watch the apple. A gentleman told 

 me to-night that he had watched the apple all through a season 

 and had been unable to locate the cause. I shall investigate and 

 study it, however, as soon as I have a chance. 



What is the remedy for the insect that attaclis cherry trees? It attaclis 

 the leaves at the time of blossoming, curls their ends and blights the blos- 

 soms. The inside of the leaf along the main veining is covered with 

 black insects that presently become flies. These black insects seem to 

 attack the new leaves. I have tried soft soap, kerosene and paris green 

 without success. 



Prof. Felt.— I have but little doubt that it is the work of some 

 plant louse. I would use some insecticide that will kill the lice 

 when it touches them. Whale oil soap or kerosene emulsion will 

 kill them; but one must begin early and be thorough. Poisons 

 will not destroy them for the reason that they do not eat, but 

 fiuck the juices out of the leaf, instead. 



What shall I do to kill the lice or slugs on my roses? 



Prof. Felt. — These slugs on the roses are of a family of aphis. 

 Make an emulsion of soap kerosene and spray the roses with it, 

 making it strong. 



When is the proper time to scrape trees to kill the codlin moth? 

 Prof. Felt. — At any time in early winter or late fall will answer 

 the purpose. 



How often should orchards be sprayed to kill insects or worms? 



Prof. Felt. — We spray orchards to kill insects and prevent 

 scab, but there are two classes of insects, one sucks, the other 

 eats, the latter may be killed by spraying with poisons, the other 

 must be fought with emulsions. They breathe through holes in 

 their bodies; kerosene emulsion, sprayed on them will stop up 



