254 State Horticultural Society. 



Insecticides. — I have come to the conclusion that the best insecti- 

 cide for fighting insects in general is the arsenate of lead. I have 

 given directions for making it, but I do not now recommend making it, 

 since it can now be purchased under the trade name of 



Disparene. — Use it instead of Paris green or arsenate of soda. I 

 am conscientious when I advise you to buy it and use it instead of mak- 

 ing it, for a first-class arsenate of lead is now on the market. You 

 can rely upon it. It comes in the best form, and very concentrated. 

 It sticks upon the trees beautifully. It will be successful only with 

 biting insects. 



The attachment for the mechanical mixture of kerosene and water 

 made by most of the pump makers is a great saver of time. I would no 

 longer make the kerosene emulsion. These combined pumps will make 

 a mixture of any strength desired from five per cent, to fifty per cent. 

 A ten per cent, mixture is about right for general use. 



DISCUSSION ON SPRAYS. 



Question : Is there a pump which will do the work uniformily ? 



Prof. Stedman. — I have no trouble with the bulk of the pumps. 

 If you find your pump is working irregularly there is something wrong 

 with the valve. Usually they give very little trouble. 



You can then mix kerosene with Bordeaux, and also add Disparene, 

 and thus spray against all kinds of insect and fungus pests at one time. 

 Disparene does not need m.uch agitation to keep it from settling. If 

 Paris green is used in Bordeaux mixture you will need to add a little 

 more lime to prevent burning the foliage. 



Question : Can this kerosene attachment be put upon an old pump ? 



Prof. Stedman. — No, you will have to buy a new pum^p. I would 

 advise everybody to get one. The ten per cent, kerosene water mixture 

 will kill a great many insects even of the biting class. Last spring I 

 killed a number of insects in this way^^ among them the canker worm and 

 the rose slug, Disparene remained on the trees more than a month. 



J. H. Hale. — Notwithstanding all the elocution that has preceded 

 me, I must say that in all my experience for a period of years there is 

 not a pump throwing part oil and part water that is safe to use. I 

 have used ten or twelve of them and you may set them at ten per cent, 

 kerosene and they will spray anything from five per cent, to fifty per 

 cent. 300,000 trees were killed in Houston county, Georgia, in one year 

 by using these pumps. Don't use them ; they are all wrong ; they will 

 not stay right, I have never used Disparene myself, but I gave the ex- 

 periment station in Georgia a block of three thousand trees in my 

 orchard. The result of the experiment was they took more than seventy- 



