31 



fungi as they are brought in contact wilh it by the surrounding 

 atmospliere. 



Should the lime be air slaked, more than four pounds may be 

 needed as it will have lost much of its strength. 



AMMONIACAL CARBONATE OK COITKR. 



Fonuiila. 3 oz. Carbonate of Copper. 



Liquid ammonia enough to dissolve the Copper, 

 which will be about ;> qts., varying somewhat 

 according to its strength. 

 Before using, dilute with water to 2;') gallons. 



This mixture is to be used after the fruit approaches ripening, when 

 it would be disfigured by the Bordeaux mixture. 



DUV BOUDEAUX MIXTURE. 



The difficulty often experienced in using the liquid Bordeaux mixture, 

 from the pumps getting out of repair, the nozzles clogging, or the 

 disligurement of horses, harness, trees and other objects has 

 led to a demand for something less objectionable and more easily 

 applied. To meet this demand there has been .manufactured in many 

 places the powdered or dry Bordeaux mixture. 



If properly made these powders contain the same ingredients as 

 the liquid Bordeaux and in the same form, i.e. Hydrated oxide of 

 Copper and Calcium oxide. This has been shown by the analyses of 

 ten samples sent in by the horticultur:tl division to the laboratories of 

 the station, but it is doubtful if it can be made to adhere as firmly 

 to the foliage as the liquid form and we know of no experiments 

 where its value has been proved. Although it has not been determin- 

 ed whether the lime, especially when in a fresh state, will be wholly 

 harmless on all kinds of foliage, or whether Paris green or other 

 insecticides can be used with it equally well, with the modern im- 

 proved methods of applying powders to plants and trees, yet we 

 would recommend a careful trial of this substance. The great diffi- 

 culty in its use will be in selecting times for its applicati( n when the 

 foliage is wet with rain or dew without which it will not adhere. To 

 make the powder more adhesive it is suggested to add an equal amount 

 of very fine dry flour, thoroughly mixed with it. When moistened 

 this will adhere for a long time to the foliage and probably will give 

 up the copper readily enough with each rain to serve the purpose of 

 destroying all spores of fungi that may come in contact with it. 



To apply this dust to tall trees, a long tube will be needed to con- 

 duct it nearer to the point of distribution, otherwise there will be a 

 great loss of material. The cost of this mixture should not be very 

 great as all the materials of which it is made are cheap and it could 

 be readily prepared by the consumer, by making a moist Bordeaux 

 mixture and drying the precipitate, but for the necessity of making it 

 very fine by grinding. 



INSECTICIDES. 



For general purposes two insecticides only are used. Paris green 

 for all chewing insects and kerosene emulsion for sucking insects. 



