REPORT OF THE HORTICULTURIST. 



107 



ARSENATE OF LEAD. 



The experiments with this insecticide commenced in 1895, continued in 1896, were 

 again carried on this year. The results would seem to indicate that it is an effective remedy 

 against codling moth. The insecticide was made by dissolving one-half of an ounce of 

 arsenate of soda in one quart of water, three-quarters of an ounce of acetate of lead in 

 an equal quantity, then pouring the two together and diluting with water, to five gallons. 

 This mixture sprayed three times on two trees of Orange crabs yielding five bushels, 

 gave an average of five wormy specimens in each bushel. 



ARSENATE OP LEAD WITH BORDEAUX MIXTURE. 



The above formula was used in connection with Bordeaux mixture, 4 : 4 formula 

 replacing Paris green. One tree each of Jumbo and Ball's Winter crab apples were selected. 

 Three applications were made. The result was disastrous to both foliage and fruit. 

 The former was badly scorched, while the latter was rendered entirely unfit for market 

 on account of the skin bearing deep patches of russet besides numerous blotches and cracks. 

 The number of wormy specimens averaged four to each bushel of fruit. Check trees 

 standing alongside were healthy and normal, so that there seems no reason to doubt that 

 the corrosive and injurious action was due to some unfavourable combination of the 

 insecticide with the fungicide. In former experiments this injurious effect was not 

 noted. 



Table showing per cent of Sound and Wormy Fruit obtained by the different mixtures. 



Mixture. 



1 Lysol i per cent sol 



2 Lysol 1 per cent sol 



3 Lysol 1-1^ per cent sol 



4 Formalin i per cent sol 



5 Formalin | per cent sol 



6 Formalin \ per cent sol 



7 Bordeaux 4 : 4 Paris green 



8 Paris green 



9 Bordeaux 6 : 4 Paris green 



10 Paris green 



11 Arsenate of Lead 



12 Bordeaux mixture, arsenate of lead 



13 Checks 



Handpiokbd. 



Per cent 

 Sound. 



97 

 92 

 96 



100 

 98 

 96 

 99 



100 

 99 

 98 

 99 



100 

 92 



Per cent 

 Wormy. 



2-8 

 7-3 

 3-6 



11 

 3 1 



•8 



■3 

 1-2 



•7 



8- 



Windfalls. 



Per cent 

 Sound. 



92 



80 

 93 

 94 

 85 

 95 

 98 

 99 

 99 

 99 

 98 

 99 

 89 



Per cent 

 Wormy. 



Handpioked 



AND 



Windfalls. 



Per cent 

 Wormy. 



SPRAYING EXPERIMENTS AT ST. CATHARINES. 



(Superintended by Martin Burrell, Esq.) 



Object of the experiment : — To prevent peach leaf curl, rot of the fruit of peach 

 and plum, and orange rust of the quince. 



Lysol of three strengths was used : (1) | per cent (2) 1 per cent, and (3) 1^ per 

 cent. (4) Copper sulphate, 2 lbs. to 25 galls, of water for first application followed by 

 Bordeaux mixture. (5) Bordeaux mixture, 3 : 3, 40 gallons. The first application was 

 made on Apr. 17, when the peach buds were beginning to swell. The 2nd on May 22, 

 3rd on May 26 (repeated on account of rain), 5th on June 12, 6th on July 10. 



