82 



MISC. PUBLICATION 6 2 6, U. S. DEPT. OF AGRICULTURE 



tiny 4-winged gall wasps, which emerge 

 by cutting an opening in the outer wall 

 of the gall. Apparently these swellings 

 do not constitute a serious menace to 

 the plant except that they kill the parts 

 attacked. 



Treatment. — Remove and burn the 

 fresh galls before the larvae contained 

 therein can complete their development. 



7 



Figure 139. — Mossy rose gall on a rose 

 stem. About natural size. 



>i 



J 



Figure 140. — Rose root galls at the 

 base of a rose stem. About two- 

 thirds natural size. 



Buffalo Trcchopper 



The buffalo treehopper (Ceresa buba- 

 lus (F.)) (fig. 141) makes double rows of 

 curved or crescent-shaped slits in the 

 bark of twigs in which to lay its eggs. 

 Nursery plants, especially rose and 

 various shrubs, and shade and fruit 

 trees are attacked in this manner. This 

 causes the bark to become roughened, 

 somewhat scaly, and cracked in appear- 

 ance. The attacked twigs never make a 

 vigorous growth. The nymphs that 

 hatch from these eggs late in the follow- 

 ing spring feed by sucking the juices 

 from aster, lily, and other plants, and 

 grasses and weeds. The adult, which 

 appears in August, is an active, grass- 

 green, triangular insect having a char- 

 acteristic two-horned enlargement at the 

 front, and is about % inch long. 



Figure 141. — Twig showing work of 

 the buffalo treehopper: a, Female at 

 work; b, recent egg punctures; c, bark 

 reversed with eggs in position, slightly 

 enlarged; d, single row of eggs, still 

 more enlarged; e, wounds of 2 or 3 

 years' standing on older limbs. 



Treatment. — If fresh egg scars are 

 found on twigs, cut and burn them be- 

 fore the eggs hatch in the spring. Dor- 

 mant spraying with white-oil emulsions 

 is useful in destroying the eggs. 



Prevention. — Clean culture about 

 the garden and destruction of weeds 

 and grassy areas, especially late in July, 

 are of vital importance. 



