804 



Bordeaux Mixture. 



(JAN. 



benefit from spraying with Bordeaux mixture cannot be j 

 obtained. 



As regards the nozzle, the fact must be emphasised that a I 

 special type is required, which may be called the " Bordeaux 

 nozzle." There is at the present time a considerable amount I 

 of spraying with Bordeaux mixture being done in this country I 

 with unsuitable nozzles. This results not only in a waste of i 

 labour and material, but even in actual harm — sometimes I 

 to the trees by " drenching" those varieties which should be ; 

 only lightly sprayed (see below), and sometimes (in the case I 

 of orchards) by causing so much dripping from the trees and j 

 actual spraying of the grass around, that poisoning of sheep 

 which may be allowed to feed on the grass in the orchard may I 

 result. It seems probable that actual cases of the death of i 

 sheep poisoned by feeding on grass around trees improperly 

 sprayed with Bordeaux mixture occurred in Kent last ! 

 season. 



The wrong kind of spray for use with Bordeaux mixture is 

 shown in Fig. 5 ; here, although a small quantity of "misty " 

 or smoke-like spray can be seen hanging in the air, the 

 greater amount of the spray produced is more or less jet-like, I 

 as shown by the lines of large drops, which should be absent. 

 Most kinds of nozzles used for hop washing throw a spray of 

 this nature, and at the present time much wasteful or even j 

 dangerous spraying is being done in this country with this 

 type of nozzle. The right kind of spray is shown in Fig. 6; 

 here the greater part of the fluid is broken up at once as it 

 leaves the nozzle into a very fine "misty" or smoke-like j 

 spray.* 



It follows that because the spray of Bordeaux mixture must 

 be "misty," and not jet-like, it must be carried close to the 

 part sprayed. In the case of tall trees this necessitates the use 

 of long bamboo "extension rods." The fact that tall trees 

 cannot be sprayed with Bordeaux mixture by means of a jet- 

 like spray sent up from the ground cannot be too strongly 

 insisted upon ; to secure a fine "misty " spray which shall drilt 



* Arsenate of lead (which will protect the leaves of fruit trees from all leaf-eating 

 caterpillars) can be mixed with Bordeaux mixture with perfect safety ; this combined 

 insecticide and fungicide should be applied in a smoke-like spray as described, 

 here. 



