Symptoms 



fails to fruit and finally dies. Wood becomes 

 discoloured, starting at a wound. Silver-leaf, 

 due to Stereum purpureum, which fruits only on 

 the wood which it has killed. Cut out and bum 

 all affected branches below the point at which 

 the wood is discoloured. Keep all dead wood 

 out of trees. Paint over aU wounds (p. 57). 

 The fungus enters only by wounds. Attacks 

 various trees, especially " stone fruits." 



Under side of leaf sprinMed with chestnut 

 brown heaps of spores, darker in the later 

 stages ; whole leaf yellowish. Rust due to 

 Puccinia Pruni, which has as alternate host 

 Anemone coronaria (see Anemone). Remove 

 anemones from neighbourhood of plums. Spray 

 with Bordeaux mixture in June and July 



(7). 



Fruit. — ^Young fruits grow very rapidly, 

 globose at first, but becoming elongated and 

 curved, up to two inches long by end of June ; 

 yellowish or reddish at first but becoming grey, 

 then black, finally falling. Probably spraying 

 with Bordeaux mixture (7) as soon as petals 

 faU would check the disease, which is called 

 " pocket plimis " and is due to Exoascus Pruni. 



For brown rot see Apple. The attack on the 



stem is more frequent than in the apple, and 



particular attention should be paid to pruning 



out the branches and spurs which show the 



92 



