100 TREATISE ON 



CHAPTER V. 

 On Diseases & Fruit Tree Pests. 



TREES, like animals, are prone to debility and disease and are exposed to a variety of 

 pests as they go through different stages of life. The principal diseases of fruit trees are 

 cankers, gummosis, blight or blast, mildew, chlorosis, &c. Their most formidable pests 

 are white grubs, aphids, ants, cockchafers, pear lace bugs, vine grubs, snails, dormice, 

 &c. 



Article I. On Diseases of Trees. 



1°. SAP contaminated by polluted water or by excess manure will rupture cellular 

 tissue at several places, spread between the wood and bark, and detach them from each 

 other. It festers there more and more and oozes out like a sanies with an acrid & corrosive 

 property that spreads and transmits the damage to nearby parts of the tree giving the 

 name canker to this disease. If only small branches are afflicted, they're cut off. If it 

 appears on the trunk or on some of the large branches, the cankerous portion is removed 

 by an incision up as far as the living tissue that is covered up with cow dung or with rich 

 soil. If water or manure are the sources of the disease (it sometimes can be brought on for 

 other reasons), these sources are eliminated and the soil around the roots is refreshed, 

 allowing the water to run off. But if the disease has progressed & has spread extensively 

 over the trunk, the tree is lost. 



2°. When the sap of stone fruit trees itself extrudes. 



