EXPERIMENT STATION BULLETINS. 419 



before blossoming, at the same rate as previous spray. The removal 

 of all grass, weeds and trash in the plant rows, keeping them clean and 

 well cultivated, will help to prevent this disease. 



Orange Rust may appear in May or June. It is easily identified by 

 the bright orange color on the under sides of the leaves. There is no 

 method of preventing this trouble. As soon as it ^s found, the bush 

 should be dug out and burned. If allowed to remain the disease will 

 spread and destroy many plants. Secure disease free plants in starting 

 new plantations. 



"Worms" or "Slugs", — may appear at any time. Spray with an 

 arsenical if early in the season, but if near picking time, use hellebore 

 or pyrethrum. 



Cut out and burn gouty galls, tree-cricket eggs and borers in stems. 



Strawberries. 



Examine the young plants before setting them. Pick off all dis- 

 colored or diseased leaves. If root-lice are suspected dip the root in 

 strong nicotine solution. 



After the growth starts, spray with bordeaux and an arsenical 

 poison to prevent the leaf-spot, and to destroy the leaf-roller insect that 

 may be present. 



For fruiting plantations, spray with bordeaux before blossoming, and 

 repeat ten days to two weeks later after blossoming. After fruiting, 

 if the bed is to be fruited again, mow and burn over quickly (as on a 

 day when there is a wind, to avoid burning the crowns of the plants). 

 If Leaf-Rollers have been present in the immediate past, spray with 

 poison aftr the growth 'has started again, but before the leaves curl. 



For Strawberry Root-Louse, — be sure to set out clean plants, dipping 

 the roots in a wash of nicotine-sulphate when necessary, using one pint 

 to 100 gallons of soapy water and setting on land which was under in- 

 tensive cultivation when possible in order to avoid the presence of ants 

 in the soil. 



Potatoes. 



For the Blight and "Bugs," — begin spraying with bordeaux-mixture 

 and poison when the "bugs" first appear, or when the plants are about 

 eight inches high, and repeat about every two weeks as long as the 

 plants are growing. Spray often in warm, muggy weather; fewer 

 sprayings are necessary in dry weather. 



Use bordeaux-mixture (4 pounds copper-sulphate and 4 pounds of 

 unslaked lime or 6 pounds of hydrated lime to 50 gallons of water), 

 and put in poison, — about 1 pound of the powdered arsenate of calcium, 

 or 1 quart of the istock solution of Kedzie-mixture. This amount of 

 Kedzie-mlxture is equivalent to % pound of Paris-green. Some growers 

 prefer to use even more than this. Arsenate of lead at the rate of 2 

 pounds to 50 gallons of bordeaux is extensively used but it costs much 

 more than either of the poisons noted. 



Potato Aphis. During wet summers and especially during those that 

 follow cold, wet springs, the potato-louse is apt to appear. This potato 

 louse is not such a difficult insect to kill if one can only reach it with 

 a spray. The difficulty comes from the fact that it hides under the 

 foliage of the potato, and that the spray must be directed upward from 



