|
While the diseases of plants are not something new, since the his-torical writings of the ancients mentioned rusts, cankers, and smuts,the study of how to combat them is not only a new but an everchangingsubject. Accordingly, the reader is urged to consult the latest bul-letins of his State Experiment Station or of the U. S. Department ofAgriculture before embarking very far upon a programme of spraying or ]of otherwise combating these diseases. Not all insects which live on or about plants are harmful. Thusthe honey bees, the "lady-bugs," and many others are beneficial sincethey either pollenate the flowers or eat other harmful insects. The |
|||
|
