NEW YORK EXPERIMENT STATION BULLETINS. 



377 



for the destruction of the codlin moth and the apple scab (Fusicladium 

 dendriticum) . "Two rows of Jeniton trees set to fruit were selected, one 

 of which was sprayed twice with Paris green, and the other row was sprayed 

 once with Paris green, and once with Paris green and the Bordeaux mix- 

 ture, using two pounds of lime and four pounds of sulphate of copper 

 instead of four pounds of lime and six pounds of sulphate of copper, to 

 twenty-two gallons of water. The effect of the copper mixture was very 

 marked, both upon the foliage and fruit. The leaves upon the trees thus 

 sprayed were larger, of better color, and remained on the trees much 

 longer than those sprayed only with Paris green. The fruit was also larger, 

 more fair, and less cracked." No injury to foliage is reported. It is cer- 

 tain that a combination of Paris green and the Bordeaux mixture can be 

 applied with safety in the proportions ordinarily used; and the combination 

 appears to be as effective as when the two materials are used separately. 



Combinations of ammoniacal carbonate of copper and Paris green have 

 been tried at some of the stations. Experiments made by Maynard of 

 Massachusetts, show that when Paris green is applied with the fungicide, 

 even at the rate of one pound in 500 gallons of water, serious injury to 

 foliage results. The combinations, however, "reduced the injury from the 

 codlin moth to 29 per cent., while where no Paris Green was used the per 

 cent, of wormy fruit was 70." The applications showed no decrease in 

 the amount of scab present, but in every case an increase. 



The effect of applying London purple with the ammoniacal carbonate of 

 copper, as determined by Gillette, is shown in the table. The numbers 

 represent percentages of injury. 



" The results reached were not uniform but in the majority of cases the 

 injury resulting was less than when water alone was used." 



Gillette also used a combination of the sulphate of copper and London 

 purple, and his conclusion is that "the severe injury resulting from 

 applications of London purple in a simple sulphate of copper solution make 

 it certain that this cbmbination should never be used upon foliage." 



E. G. LODEMAN, 



Assistant in Horticulture. 



Note. — Spraying to destroy injurious insects and fungi has now come to be a neces- 

 sity in fruitgrowing and vegetable gardening. Much of its success depends upon the 

 operator, however. The treatment must be timely, thorough, and persistent. Above 

 all things, be ready, and begin to spray the moment the first injury is seen, or even 

 before. Study the question during the winter, and buy the materials before spring 

 opens. Always use the finest and most forcible spray which will reach the desired 

 height. 



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