48 



the same varieties of potatoes with Paris green alone. The potatoes 

 for this experiment were planted in 1903 on June loth, and the spray- 

 ing's took place on July nth, July 23rd, and August 6th; and those iri 

 1904 were planted on June nth, and the sprayings took place on July 

 i6th, July 29th, and August 4th. The Bordeaux mixture was 

 made in the same way and in the same proportions as described in the 

 College Bulletin No. 122, copies of which may be obtained from the 

 Department of Agriculture, Toronto, Ontario. The results show that 

 there was less rot on the potatoes on which the Bordeaux mixture and 

 the Paris green were used than on those on which the Paris green was 

 applied alone. In the case of both varieties of potatoes on which the 

 Bordeaux mixture was used, the tops kept greener to a later date than 

 those which did not receive this treatment. 



Different' Methods of Treatment for the Potato Beetle. 

 Owing to the severe ravages of the Potato Beetle in Ontario, an experi- 

 merit has been conducted in duplicate in each of nine years by using dif- 

 ferent methods for destroying the insect. The experiment consisted in 

 spraying the potatoes with Paris green and water, Paris green and 

 plaster, ^nd Potato Bug Finish. The test was conducted in duplicate 

 each year. As a rule, three applications were made on each crop. For 

 the sake of comparison, one plot was allowed to remain untreated. 



In 1902, in 1903, and again in 1904, six lots of each of two varie- 

 ties of potatoes were carefully selected and planted on separate plots. 

 After the potatoes had made sufficient growth and the potato beetles 

 (bugs) had made their appearance, five plots of each variety were treat- 

 ed in different ways to destroy the beetle, and one plot of each variety 

 was left untreated as a basis of comparison. The five treatments made 

 in each of the years were as follows : (i) Paris green and water, using 

 one pound of Paris green and 96 gallons of water per acre ; (2) Paris 

 green and plaster, using one pound of Paris green and thirty-eight 

 pounds of plaster per acre and applying the mixture to the potatoes in 

 the dry condition ; (3) Potato Bug Finish, which was applied dry at the 

 rate of twenty pounds per acre ; (4) Bug Death and water, using on an 

 average thirty-two pounds of Bug Death and 96 gallons of water 

 per acre; and (5) Bug Death used in the same proportion as No. i, but 

 in the dry condition. Three applications of each of the five treatments 

 were made in both cases. In the autumn, the potatoes from each of 

 the twelve plots were dug and weighed. The following are the aver- 

 age results of the smaller experiment conducted for nine years, and of 

 the larger experiment conducted for three years : 



