DISEASES. 



Canker. This somewhat obscure and variable disease often affects 

 Peach trees in different forms, and in all cases causes serious injury. 

 Sometimes the branches are affected, when portions of the bark and wood 

 beneath become discoloured, gradually wither and become dead. Very 

 frequently the disease appears upon the points of the young shoots, which, 

 consequently, wither and die back. Then, again, sometimes the roots are 

 the parts that are affected The disease may arise from various causes, 

 such as extremes of dryness or moisture at the roots, injury by insects, or 

 mutilation either to the roots or branches, ike. Remedies : The only 

 effective way of dealing with this disease is to amputate the parts that are 

 affected when practicable, either roots or branches. For further particulars 

 as to this disease see article upon Canker, page 93, volume 1. 



Gumming. This is one of the most troublesome and common diseases 

 that affect the Peach and Nectarine, as also other stone fruit trees. As 

 the name implies, it shows itself by the formation of masses of gum, which 

 exude from cracks or wounds in the bark of the trees. The causes of this 

 disease are not known for certainty, and probably they are various. For 

 full particulars respecting this disease and its treatment see article upon 

 Gumming, page 94, volume 1. 



Leaf Galls. This disease is somewhat common to the Peach, as also 

 various other fruit trees. The " Galls " may be caused by the attacks of 

 either insects or fungi, and though when few in number, as is frequently 

 the case, they do not materially injure the trees, yet when numerous they 

 are a check to healthy leaf action. Remedies: 1. Bordeaux Mixture. 

 2. Resin Compound. Using both as fine sprays, 3. Lime and Sulphur 

 dusted over the foliage. For further information see article upon Leaf 

 Galls, page 95, volume 1. 



Hoot Gout. Sometimes the roots of Peach trees are studded with 

 irregular swellings, which assume the form of wart-like knots and rings, 

 and these are often discoloured or cankered. In appearance they are 

 somewhat like roots affected by Thread, or Nematode, Worms, previously 

 described, but the trouble comes from other causes. As in the case of 

 some other diseases the causes are obscure, but probably are the result of 

 injuries causing ruptured roots through rough or careless working among 

 them, the use of over strong manures, or possibly the punctures of minute 

 insects. Roots affected in this way become brittle , and gradually cease to 

 perform their proper functions. They have also a tendency to produce 

 adventitous buds and send up suckers. Remedies : When but slightly 

 affected, the roots should be opened out and the diseased ones cut a\\ay 

 to such an extent as may be practicable. If the roots are badly affected 

 there is but small hope of a cure, and the better plan will be to destroy 

 the trees at once. 



Yelloivs. This name appears to be applied to several obscure diseases 

 in various parts of the world for the reason that the foliage of affected 

 trees has a yellow or pale appearance. Sometimes it is applied in 

 Australasia to trees that are affected with Rust, but more frequently to 

 those whose foliage is unhealthy through weakness induced by poverty of 



