21 



TREATMENT RECOMMENDED FOR 1893. 



1. Spray with Copper Sulphate, formula a, before the bads 

 unfold. 



2. Use the Bordeaux mixture with 1 lb. of Paris green, 1 lb. to 

 100 gallons just before the blossoms unfold for the tent caterpillar, 

 canker-worm and bud-moth larvae. 



3. As soon as the petals have fallen repeat the spraying with last 

 mentioned solution and again in about two weeks, for the codling 

 moth. 



4. Use the Bordeaux mixture alone at intervals of from two to 

 four weeks until August 1st. 



5. Spray with the Ammoniacal Carbonate of Copper once or 

 twice should the weather during August be moist and cool. If the 

 weather should be dry no further spraying need be done. 



POTATO BLIGHT AND ROT. 



The potato blight and rot fungus, which causes the vines to die 

 before maturity and the tubers to rot, is one of the greatest obstacles 

 to the profitable growth of this crop in all parts of the country. 



The fungus which causes all this injury is closely related to the 

 grape mildew which we are able to destroy by the use of copper 

 solutions. 



To test the value of these solutions in preventing the potato blight 

 and rot, a field of about one acre was selected and divided into two 

 sections with check rows running through the middle. The west 

 half was sprayed with the Bordeaux mixture one-fourth strength, i. e. 

 100 gallons to standard formula, and the east half with copper sul- 

 phate solution 1 lb. to 800 gallons of water. 



Paris green was used at the rate of 1 lb. to 200 gallons of the 

 mixtures. 



Three applications were made to each plot at intervals of from two 

 to three weeks from July 1st to Aug. 28th. 



RESULTS. 



1. The vines on the east half were all dead Aug. 28th, while 

 those on the west half remained green until Sept. 16th. 



2. The crop was dug Sept. 23d and 24th, yielding as follows : 

 Vv''est half, merchantable potatoes, 4426 lbs. 



" " small potatoes, 431 lbs. 



" " less than 1% of decayed tubers were found. 



