Pests and Diseases 



(Nectria ditissima, Leaflet No. 56) may be said to 

 be beyond a cure, and the same is true with respect 

 to Silver Leaf of Fruit Trees. (See Fig. 16.) The 

 destruction by fire of all dead wood and treating 

 the wounds with tar will undoubtedly check both 

 diseases, but after a time the fungus breaks out 

 again in other places on the tree. Scions for graft- 

 ing should not be taken from such trees, for, although 

 the scions may appear to be healthy, the diseases 

 will socner or later break out on the grafted trees. 



HOW TO AVOID MANY TROUBLESOME 

 PLANT PESTS. 



It is a curious fact that certain varieties of fruits, 

 flowers, and vegetables are more or less immune 

 from the attack of many pests and diseases, and in 

 this connection it is most important that careful 

 observation should be made in the fruit garden 

 and records should be kept so that the susceptible 

 varieties may be detected and eventually discarded. 

 Very little published information on this matter is 

 available at present and it is desirable that authentip 

 cases should be reported to the Press and to the 

 Board of Agriculture. 



Any check to the growth, such as that caused by 

 drought, will render the plants more liable to attack 

 and steps should be taken to prevent checks of this 

 kind. 



Stimulating manures, such as sulphate of ammonia 

 and soot, if applied in small quantities, will be very 

 useful in helping the plants to recover from checks 

 caused by bad weather. (See also advice on 

 MANURES AND MANURING in "The Kingsway 

 Allotment Book," Evans Bros., Ltd.). 



73 



