312 The Spraying of Plants. 



INSECT ENEMIES. 



Hollyhock-bug (Orthotylus delicatus, Uhl.). Description. These 

 bugs, which are bright green in color, sometimes attack holly- 

 hocks early in the season so vigorously that the plants wilt, and 

 occasionally die. The insects suck the juices of the plants, and 

 are undoubtedly their worst insect enemy. 



Treatment. Kerosene emulsion has been successfully used 

 against the pest, and if the applications are commenced as 

 soon as the bugs are seen, no serious damage should result. 



MAPLE. 



FUNGOUS DISEASES. 



Leaf Spot (Phyllosticta Acericola, C. & E.). Description. The 

 fungus attacks the foliage of both large and small trees, destroy- 

 ing the green coloring matter. It appears in spring, causing 

 the formation of dark brown areas which enlarge very rapidly. 

 Later the parts first affected assume a lighter, or even a gray 

 color, although there is much variation in the appearance of 

 the disease upon different species of maples. The patches 

 may finally extend over the entire leaf. 



Treatment. Large trees are treated with difficulty, but nurs- 

 ery stock may be easily reached. Plants should be sprayed 

 thoroughly with the Bordeaux mixture as soon as the leaves 

 appear in spring, and new treatments should be made so that 

 the young growths shall at all times be protected. Destroy- 

 ing affected leaves may assist in checking the disease upon the 

 shade trees, but spraying them by means of proper machinery 

 will prove most satisfactory. 



INSECT ENEMIES. 



Green-striped Maple-worm (Anisota rubicunda, Fabr.). 

 Description. The adult insect is a moth of a yellowish-white 

 color, the shade varying in different parts of the country. The 

 spread of the wings is about two and one-fourth inches. The 

 insect passes the winter in the pupal state, and in spring, when 

 the adult moths appear, large numbers of eggs are laid, gener- 

 ally in clusters on the under side of the leaves. The larvae are 

 striped longitudinally with alternating bands of light and dark 



