INSECT PESTS & DISEASES 

 OF PLANTS. 



(See Plates Was. 2 and 3 with Reference attached.) 



GARDENING can afford but little enjoyment or profit unless 

 good cultivation and cleanliness form its chief characteristics. 

 Plants covered with green fly, mealy bug, or red spider are 

 too frequently seen in neglected gardens. What possible 

 enjoyment can such wretched gardening afford. Amateurs 

 as well as experienced horticulturists should make them- 

 selves familiar with the life history of the numerous creatures 

 which infest their trees, flowers, and vegetables. When this 

 knowledge is attained, the fruit and flower grower can go to 

 work intelligently to exterminate their insect enemies. 



All garden plants are subject more or less to the attacks 

 of insects of some kind or other. The best means at our 

 disposal for the prevention of their attacks is to keep the 

 plants in a vigorous state of health ; this will not, however, 

 always succeed. It is therefore necessary that other means 

 should be taken whereby they may be kept in check. 



Aphides, commonly called Green Fly or Plant Lice, are 

 amongst the greatest enemies of the vegetable world, upwards 

 of 300 species have been described the powers of multipli- 

 cation possessed by these little insects is almost incredible. 

 Professor Huxley calculates that a single Aphis, in five 



