554 



CALIFORNIA FRUITS: HOW TO GROW THEM 



INSECTS UPON BARK OR SURFACE OF LEAVES 

 OR FRUIT 



Leaf Lice. Leaves of fruit trees, especially the apple and plum, 

 are sometimes almost covered with lice or aphides of different 

 colors, from light green to black, some individuals having wings 

 and some wingless. Available remedies for all these leaf lice are 

 the kerosene emulsions and other mixtures which will be given 

 later as summer washes for scale insects, with a spray nozzle which 

 sends spray upwards, so as to reach the under sides of the leaves. 

 Very often these pests are apparently cleared out by lady-birds and 

 other insects which devour them. The engraving shows the gen- 

 eral form of the aphis tribe. 



Larvae of tussock-moth feeding on apple foliage and fruit. 



Thrips. Very minute insects infesting buds, leaves and blos- 

 soms of pears, prunes, cherries, peaches and many other trees and 

 plants. The attack on leaves and buds causes them to wither and 

 fall off. Indeed complete defoliation may follow their attack. When 

 thrips infest fruit blossoms the essential parts are eaten off by the 

 insects and the attacked blossom sets no fruit. Much damage is 

 done by the insect and thorough investigation w.as pursued by the 

 Bureau of Entomology of the U. S. Department of Agriculture, 

 by Mr. Dudley F. Moulton, who in 1909 became Deputy Horticul- 

 tural Commissioner of California. Mr. Moulton's publication of 



