22 



SPRAYING THE APPLE ORCHARD. 



Fig. 13.— The egK 'JU ;> leaf— greatly 



were from the nearest apples, and other points, all of which 

 have a practical bearing upon combating the pest, as will 

 be seen below. Three of these large cages and numerous 



smaller ones covering indi- 

 vidual limbs or twigs were 

 used last season. It was 

 found that practically all 

 of the eggs were laid upon 

 the leaves, upon the upper 

 or under surface indis- 

 criminately and a few, less 

 than one twentieth, on the 

 apples and bark. In 1906 

 the first eggs were laid 

 June 10 and the last about 



enlarged. July 1. 



The individual egg upon the leaf or fruit looks much like 

 a small white blister, about the size of a 

 pinhead. It is at first quite transparent, 

 but later a blackish streak is seen, showing 

 the caterpillar forming within. The eggs 

 are seen with difficulty and are found only 

 by the most careful search. They hatch in 

 from five to ten days, depending upon the 

 temperature, those laid in the middle of 

 June hatching ten days later, and those 

 laid June 29 in five days. 



The Larva, or Apple Worm. — The 

 young apple worm is at first only about 

 one sixteenth of an inch long, of a whitish 

 color, with a shining black head, and with 

 distinct, blackish tubercles on the back, 

 which become quite obscure in later life. 

 As soon as the young worm crawls from the 

 egg it usually makes a frugal breakfast 

 upon the tender part of a leaf, preferably 

 at the juncture of the veins on the under 

 surface. Indeed, occasionallv a worm may 



Fig. 14. -The young 

 a p p 1 e w () r m — 

 greatly enlarged. 



