182 Teuck Geowinq in the South. 



Plant Diseases aee of Two Classes: 



1. Insect Pests — Preparations for whose destruction 

 are known as "Insecticides." 



2. Fungous Affections — Preparations for whose de- 

 struction are known as "Fungicides." 



1. Insects. 

 They are of two kinds : 



1. Biting Insects (or Chewing Insects), which bodily 

 devour vegetable tissue, subsisting largely on the foliage 

 of plants. A's they take the food material into their 

 stomachs they may be readily destroyed by violent poisons, 

 as the arsenites. To this class belong the Colorado potato 

 beetle, most caterpillars, and, in general, all defoliating 

 insects. 



For them Paris Green (Formula One) is the principal 

 remedy, and usually a speedy one, applied in liquid 

 form by means of a spray pump, through the nose of a 

 watering-pot or sprinkled with a broom, in the propor- 

 tion of 1 ounce to 10 gallons of water, or 5 ounces 

 to the barrel of 50 gallons, except when used on orchard 

 trees, and especially on peaches, whose foliage is very 

 sensitive, when it should be reduced to 4 ounces and 3 

 ounces, respectively, 



2. Sucking Insects — Having a tubular sucking appa- 

 ratus which they insert into the soft vegetable tissue and 

 from it extract the sap. To this class belongs all scale in- 

 sects, aphids or plant lice, and the "true" bugs, such as the 

 pumpkin or squash bug, the harlequin cabbage bug, etc. 



