14 ILLINo1Is NATURAL History SURVEY BULLETIN 
knotty, malformed fruit. Although the IIli- 
nois pear crop is not of great commercial 
importance, the insect causes an appreciable 
amount of damage. As is the case with the 
Viol 27 earings 
tance on cultivated onions in IIlinois, but 
in other states it often becomes so abundant 
on Bermuda onions that the plants are killed 
before growth is completed. It is very com- 
Fig. 15.—Mirid injury. 
Catfacing of peaches caused by Lygus odlineatus. 
A similar type 
of injury by plant bugs is common in various fruits in Illinois. 
Fig. 16.—Miurid injury. | 
althaeae and Halticus bracteatus. Note in leaf at right almost complete etiolation or destruction 
of green coloring matter, caused by feeding of these bugs. 
Extreme injury to hollyhock foliage by the plant bugs Me/anotrichus 
Similar damage frequently occurs on 
grasses, onions, phlox, clover and other plants by various mirid species. 
tarnished plant bug, no really satisfactory 
method of control under Illinois conditions 
has been developed. 
Brittain (1917) describes serious injury 
to apples in Nova Scotia by the green apple 
bug, Neolygus communis var. novas:otien- 
sis Knight. 
The onion plant bug, Labopidea allii 
Knight, is not usually of any great impor- 
mon -on wild onions and wild garlic, but 
perhaps may be considered a beneficial insect 
in this respect rather than a plant pest. 
The phlox plant bug, Lopidea davisi 
Knight, breeds on wild phlox but is often 
found colonizing on cultivated phlox and 
causing serious injury to these ornamental 
plants. The bug can be controlled by the use 
of a nicotine spray or dust, or by pyrethrum 
