The Spraying of Trees. 583 



On the -itli of last May, the Farmers' and Fruit Growers' Associa- 

 tion of Orleans County, asked us to make a test, and the society set 

 apart the orchard of F. D. Scott, near Medina, for the purpose. I 

 had visited this orchard on the 25th of June, 1894, just after the 

 worms had left it, and found many of the trees wholly bare of 

 leaves. It is a full grown orchard of various varieties, on rather low 

 ground, and comprising ^24:0 trees set about 30 feet apart each way. 

 It is a neglected orchard, and the worms have no doubt been work- 

 ing in it for some years, although they were not observed until the 

 serious outbreak of last year advertised their presence. On the 4th 

 of May, last spring, when the plantation was put in our hands for 

 experiment, there were no indications of worms in the orchard. On 

 the 9th of May, I visited the orchard again and found myriads of 

 worms ranging from an eighth-inch to a fourth-inch in length. They 

 had already done considerable damage to the little leaves, and it was 

 apparent that we were already too late to save the orchard from 

 serious injury. The flower buds had mostly broken open, but the 

 flowers had not yet expanded. The condition of the buds [at this 

 time was a little more forward than the cluster shown in the illus- 

 tration on page 567. The leaves were about an inch long. 



On the 10th of May the spraying was begun. Since the day be- 

 fore, the [insects seemed to have increased with amazing rapidity, 

 and when the limbs were rapped or jarred several excited worms 

 would spin dowm from every leaf. It looked like a hopeless task to 

 conquer them. The most infested part of the orchard was divided 

 into six plots, and these were treated as follows : 



I. One pound Paris green and 2 pounds of lime to 200 gallons of 

 water. 



II. One pound Paris green, 2 pounds lime, 144 gallons water. 



III. One-half pound Paris green, i pound London purple, 2 

 pounds lime, 225 gallons water. 



lY. One pound London purple, 2 pounds lime, 96 gallons water. 



Y. One pound acetate of lead, 51 ounces arsenate of soda, 200 

 gallons water. (The arsenate of lead mixture used successfully 

 against the gipsy moth in Massachusetts.) 



YI. One pound acetate of lead, 5^ ounces arsenate of soda, 100 

 gallons water. 



The spraying began at 9 o'clock in the morning. We used Yer- 

 morel nozzles on a Y, and the liquid was applied until the trees were 

 thoroughly wet and began to drip. My diary says that at 2 o'clock 

 that afternoon " about one worm in every six is dead in Plot I." 



