EXPERIMENT STATION BULLETINS. 465 



Raspberry and Blackberry. — Dig out plants affected with Orange rust; 

 cut out canes severely injured by anthracnose and spray with Bordeaux 

 mixture. If the plantation becomes badly diseased start anew, using 

 healthy plants. 



Strawberry. — Spray with Bordeaux mixture and arsenites for leaf 

 blight, leaf rollers and others insects, just before the blossoms open, and 

 again after the fruit has set. Kepeat after the fruit has been gathered. 



Potato. — For the Colorado beetle spray with Paris green (one pound to 

 one hundred gallons) and lime. For the early blight use Bordeaux mix 

 ture. 



Tomato. — For the tomato worm and tomato rot, spray with Bordeaux 

 mixture and Paris green. 



Cucumbers and Squashes. — Apply plaster and Paris green for the 

 striped beetle while dew is on. Trap black bugs under shingles, and 

 spray with gasoline and water (one to eight), mechanically mixed. If 

 mildews and other fungous diseases appear, spray with Bordeaux mix- 

 ture and liver of sulphur. 



REMEDIES. 

 INSECTICIDES. 



For nearly all insects that eat the foliage, or other exposed portions of 

 the trees, some material should be used that will poison them, and for 

 this purpose the arsenites are generally resorted to. Paris green con- 

 tains, when pure, rather more than fifty per cent of arsenic, and, being but 

 slightly soluble in water, is not injurious to anything except the most 

 tender foliage. This tendency to burn the foliage can be counteracted by 

 the addition of a small amount of lime. The use of lime with Bordeaux 

 mixture is of value also, from the fact that it cements the poison upon the 

 leaves and renders its effect much more lasting. For many of the fruits, 

 and other plants, Paris green can be combined with Bordeaux mixture to 

 good advantage, as the two can be applied at one time, and the lime of 

 the Bordeaux mixture will render the addition of more lime unnecessary. 

 London purple, which is an arsenite of lime, while Paris green is an 

 arsenite of copper, is often used instead of Paris green, but is rather less 

 effective as an insecticide, and, being slightly more soluble, is more likely 

 to injure the foliage. When Paris green costs more than ten cents per 

 pound, in large quantities, white arsenic will be found a cheap and 

 effective substitute for it. As the cost of the two materials is about the 

 same per pound, and, as the Paris green is about one half arsenic, the 

 latter will go twice as far, and hence be but one half as expensive. 



The following formula for preparing the above insecticide can be used 

 for all our fruits with safety, and, in case the insects have become numer- 

 ous and destructive, it would be safe, except on the peach, to increase 

 the amount of poison one half; while against the potato beetle the 

 amount of poison can be doubled. 



Paris green (or London purple) 1 pound 



Lime 5 " 



Wat^r 200 gallons 



59 



