48 



INJUKIOUS INSECTS AND FUNGI. 



[Sept. 1894. 



To prevent this disorder it would be desirable to spray the 

 trees with the Bordeaux mixture — bouillie bordelaise — composed 

 of sulphate of copper and lime. 



This mixture should be composed of from 12 to 15 lbs. of 

 sulphate of copper, and 6 to 8 lbs. of lime, to 100 gallons of 

 water. 



The strength of the mixture must depend upon the state of 

 the foliage. When the leaves are tender the weaker solution 

 should be used. When they are older the strongest may be 

 applied. But if the solution is applied as a remedy when the 

 leaves are old and the fruit is formed, its strength may be 

 increased even up to 20 lbs. of sulphate of copper and 10 lbs. 

 of lime to 100 gallons of water. 



Experiments upon this fungus with the Bordeaux mixture 

 have been made in various parts of the United States with 

 much success. 



As a means of prevention the Bordeaux mixture should be 

 applied soon after the leaves have been formed. The solution 

 must not be too strong at this stage. A second dressing may be 

 given after the blossom has set, and a third three weeks later. 



This treatment has been tried to a small extent in this 

 country, but only as a remedy so far, and rather late in the 

 season. But it appeared to check the progress of the fungus 

 upon the young fruits. 



The Diamond Back Moth {Plutella Cruciferarum). 



The first report of the appearance of the Diamond Back 

 Moth this season was received by the Board of Agriculture on 

 May 30th. There were a few reports of its appearance in 

 English counties, but the injury it caused was very trifling. 

 The weather was most propitious for the rapid growth of swedes 

 and turoips, and not favourable to the development of the 

 insect, which does not like heavy and frequent showers, as was 

 clearly shown in 1891 when there was an alarming attack in 

 the eastern parts of England and Scotland. 



The Nut Mite (Phytoptws Avellance). 



On the 29th of May many of these mites were found in 

 decaying buds of cob-nut trees that were widely opened. They 

 were also seen in quantities upon the young leaves from 

 neighbouring buds showing clearly that they get upon the leaves 

 and derive nourishment from them. They were noticed, too, 

 upon the young stems, among the hairs upon the cuticle. This 

 seems to show that tliese mites pass their lives upon the nut tree?. 



