22 



East half, merchantable potatoes, 2759 lbs. 



" " small potatoes, 494 lbs. 



" " about 3% of the tubers were decayed. 



TREATMENT REC0M5IENDED FOR 1893. 



1. As soon as the potato beetles begin to appear in large num- 

 bers spray with Bordeaux mixture and Paris green, 1 lb. to 100 

 gallons. 



2. When the larvae begin to appear, spray again with the Bor- 

 deaux mixture and Paris green, 1 lb. to 200. 



3. Continue the use of the Bordeaux mixture at intervals of from 

 two to three weeks until the tops begin to die from maturity, adding 

 Paris green at tlie rate of 1 lb. to 200 gallons as long as the larvae 

 of the potato beetle continue to appear. 



For this work the barrel pump, mounted in a one-horse cart, is the 

 most economical, the horse going between two rows and the wheels 

 between the two outside rows. From eight to twelve rows may be 

 sprayed at one time. 



RUST ON THE BLACK OR ITALIAN POPLAR. 



The black poplar is one of the most rapid and stately growing 

 trees that we have. There are many trees on the college grounds, 

 started from cuttings in 1873, that now measure more than 18 inches 

 in diameter, and up to 1891 were entirely uninjured by any species 

 of fungous or insect life. 



A year ago last summer and fall (1891) the rust came on in such 

 abundance that the leaves were yellow from the quantity of spores 

 appearing on the surface, and dropped very early in the season. The 

 injury to the tree was so great that the immature lower branches 

 were nearly killed during the winter. 



To determine if this rust could be prevented the Iqfc^er bfanches 

 and leaves were sprayed, some with the Bordeaux mixture and some 

 with the copper sulphate solution, 1 lb. to 1000 gallons of water. 

 Check trees were left without spraying. 



Five applications were made of each with the following 



No rust was found on the trees sprayed with the Bordeaux mixture 

 and the leaves remained green much longer than those of the 



