8i 



THE EEPOET OF THE 



No. 36 



were punctured, but this attack did not become at all general. However, at this 

 time an attack of great severity was made upon the fruit of three trees of an 

 unknown variety and lasted for a week. The adults feeding on the suckers, as 

 before mentioned, confined their attention largely to the newly formed buds and 

 the tender twigs, while those on the weeds showed a marked preference for the 

 horseweed (Erigeron canadensis) , which was abundant at this time. They seemed 

 to be j)articularly fond of plants of this species infested by aphids. Other species 

 of jDlants, however, w^ere also fed upon, such as mullein, ragweed, pig-weed, catnip, 

 stinking mayweed, round-leaved mallow, burdock, golden rod, Hungarian millet, 

 old witch grass, sumach, elder, orange milkweed {Asclepias tuherosa) and all the 

 plants mentioned above as food plants of nymphs except where these had become 

 too dry to attract them. 



The adults, as a rule, were not very active and were quite easily captured, 

 dropjjing from leaf to leaf when disturbed and only flying as a last resort. 



Injury. 



Fruit. The chief injury is due to the feeding of the nymphs upon the apples. 

 It is done when the fruit is from one-quarter to one-half of an inch in diameter, 

 and when the nymphs are still small. The first evidence of the attack is the 



Injury due to the feeding of Neurocolpiis nuMlus nymphs upon 

 young fruit very shortly after the attack. (Natural size.) 



oozing of droplets of juice from the punctures which are made at any point upon 

 the surface of the apple. These punctures in three or four days are evidenced by 

 small, conical to rounded pimples, varying in height and diameter from 2 to 3 mm. 

 In their apices are small, very dark green spots of tissue, beneath which is a very 

 slight streak about 3 mm. deep. These pimples vary in number from one to 

 twenty-five or twenty-six per fruit, and where abundant on a very small apple 

 cause it to wither and fall ; on a larger one they very severely stunt its growth, and 

 if the pimples are massed on one side, they cause the growth on that side to be 

 checked, and the apple to be much deformed Avhen mature. "Where the pimples 

 are few or scattered the apple may grow to normal size and nearly normal shape, 

 the pimples becoming gradually less distinct or forming small raised, brownish, 

 corky areas or convex russet spots from 3-1: mm. in diameter. 



