PREVENTIVE ANI> COMBATIVE MEASl'KES. i'.l 



Bordeaux Mixture <>r Ilouillie-Bordelaise, a '1 to 4 per cent. 

 solution of copper sulphate and lime. It is prepared liy ills- 

 solving G Ibs. of copper sulphate in warm water, and placing 

 this mixture in a barrel capable of holding about 44 gallons ; 

 in another vessel slake 4 Ibs. of fresh- burnt lime, and make it 

 up t<> a creamy whitewash with water ; strain the lime through 

 coarse canvas into the barrel of copper sulphate solution, fill 

 up with water, stir thoroughly, and the mixture is ready for 

 use. This mixture may be used either more concentrated, or 

 somewhat diluted. 



Ammoniacal Solution of Copper Carbonate. This may be 

 prepared directly by dissolving 5 oz. of cupper carbonate in 

 enough water to form a thick paste; dissolve this paste in 

 three pint< of strong aqua ammonia (or as much as may be 

 necessary to effect complete solution) then dilute to 45 gallons. 

 If copper carbonate cannot be obtained, make it by mixing (") 

 o Ibs. of copper sulphate in '1 gallons of hot water. (//) .'5.1 Ibs. 

 washing soda in 1 gallon hot water; mix (") and (M, add 

 water up to 10 gallons, stir up. and allow to settle: pour off 

 the clear liquid, till up a-ain with water and allow to settle; 

 on again pouring off the clear water a greenish sediment of 

 copper carbonate remain-. This dissolved in as much a>[iia 

 ammonia as necessary, may be kept till required when it is to 

 be diluted at the rate of 1 pint to - gallon- of water. 



Eau Celeste. iMssulve '1 11>-. of copper -ulphate in about. 

 S gallons of water; when completely dissolved add '.\ pint- of 

 strong aqua ammonia and dilute to 4 ~> gallons. This may he 

 u-ed in a modified form. 



Fungicides like these are used chiefly a-ain-t attacks of vine 

 mildew (Peronospora ritin^i), potato di<ea-e i /'/////. >j>/t fluir in- 

 festans) and iVi-ono-poreae generally: also for minn-mus ,,iher 

 leaf-di-ea-e< caii-ed by various fuiii;i. What the result- of any 

 -iveii experiment may be, is as yet difficult to say till more is 

 known of the effects of the reagents, the -tren-th of the mix- 

 ture to be u-ed, the kind of plant and its stage "f development, 

 and other factors dependent on climate. The dlicacy of .1 

 funui'-ide lie, [ess in n- effects on the funm actually piv-ent 



otln-r Aim-rii-un litrrat m r, nol lln- l.-.i-t ini| n't ant IM-MI- " Bordeaux \Ii\lno-.is 



Fungicide, " l.v I". C. I'.iio-liiM ; U.S. AIM. i. Hull. tm. N... (i. Is'.H. In tins 



<'>iMiii-rtinii reference m.i\ .'!-" ' ni;ulf ti> K. li. I.'M|,MII,HIII '- .n-.-miiit nt tin- 



"Spraying oi I'lam ' (Macmillan, lMtr,i. (Edit.) 



