292 FUNDAMENTALS OF AGRICULTURE. 



enter the apples at the blossom end. There are from 

 one to three generations each year according to lo- 

 cality. The insect is controlled by spraying the trees 

 with Paris green, arsenate of lead or other arsenical 

 just after the petals fall, thus placing a dose of poison 

 in each calyx cup to be later eaten by the larva as it 

 seeks to enter the fruit. Additional sprayings should 

 also be given in four weeks after the blossoms fall, 

 and in ten weeks, this latter for the second brood of 

 larvae where it is troublesome. The poison is now al- 



CODLING MOTH LARVA. 



most always applied in Bordeaux mixture, a fungicide, 

 thus controlling both the codling moth and fungus 

 diseases. 



THE ORANGE WHITE FLY. 



By DR. A. W. MORRILL, 

 Bureau of Entomology, U. S. Dept. of Agriculture. 



The Orange White Fly. There are several species 

 of white flies in this country, but the orange white fly 

 easily ranks as the most injurious member of the group 

 as well as one of the most destructive orange enemies. 

 This insect injures the leaves of the orange tree. The 

 adult insect, which appears like a minute white gnat, 



