44 Farmers’ Bulletin 1169. 
Cause of injury.—The locust leaves turn brown mainly because the 
green tissue within them is being hollowed out—“ mined,” we call it— 
by the flattened grubs (fig. 25, b) of this beetle; while the blister-lke 
effect on them is produced by the surface feeding pits made by their 
parents. The parents of these grubs are about one-fourth inch long; 
they are flattened, orange-red beetles (fig. 25, @) with an area along 
the middle of the back, the head, appendages, and underside black, 
and the wing covers deeply pitted. This is the stage in which the 
winter is passed. In the spring, about May, in the District of Co- 
lumbia, they appear on the leaves, feed, and begin laying eggs in 
batches of from 3 to 5. From these the grubs hatch and immediately 
penetrate to the inside of the leaf which they hollow out. On attain- 
ing full growth these grubs change to pupe (fig. 25, ¢) which, in 
turn, change to adults that come out. These also feed on the leaves 
and thus help to complete their destruction. There is apparently but 
one generation produced annually in the latitude of the District of 
Columbia. 
Fic. 25.—Locust leaf-miner: a, Beetle; b, larva; c, pupa. Five times natural size. 
(Chittenden. ) 
Remedy.—lt is only specially prized trees that are worth treating, 
and on these an application of lead arsenate (p. 11) as soon as the 
leaves appear early in the season will lill the grubs as they issue 
from the eggs and before they penetrate the leaf epidermis, and thus 
the injury will be stopped. 
GREEN-STRIPED MAPLE WORM.” 
How injurious—Some years the green-striped maple worm is a 
troublesome insect on maple trees, especially silver and swamp 
maples. In the absence of these, however, it has been found to feed 
on and defoliate other trees. It is capable of completely denuding 
the foliage twice or even three times during the same season, not 
only of entire trees but of entire rows and groves of them. Aside 
from disfiguring the trees for the time being, the defoliation also 
weakens them. 
21 Anisota rubicunda Fab. 
