spray must actually come into contact with the insects, preferably 
with some force. All sprayings for sucking insects must be 
thorough in character, so as to wet them completely with the 
spray used. 
Rose-chafer. These insects, belonging to the beetle group, 
appear about the time that roses and grapevines are in 
bloom and do an enormous amount of damage by eating the 
flowers. No satisfactory treatment has yet been discovered. 
Picking them off by hand and dropping them into a can of kero- 
sene, or otherwise destroying them, is as good a practice as any. 
Spraying the plants attacked with sweetened lead arsenate some- 
times helps to reduce their numbers. 
Round-headed Eorer: Flat-headed Borer. {Fig- 4.) Attack fruit 
trees, being partial to apples. They 
are the larvae of beetles, and bur- 
row into the wood at the base of the 
trunk. Close watch should be kept 
on fruit trees, and when borers are 
found to be present they should be 
dug out or killed by inserting a wire. 
Carbon bisulphide may be injected 
into the hole and the opening then plugged with with soap or 
putty. Preventive treatment as described in the introduction 
should also be used. 
Colorado Beetle (Fig. 5.) Both 
the adults and larvae 
do much damage to pota- 
toes, tobacco, petunias, and 
other solanaceous plants by 
eating the leaves. Affected 
plants should be sprayed 
with lead arsenate or dusted 
with Paris green, renewing 
the poison at intervals until 
Elm Leaf Beetle. (Fig. 6.) The adult attacks the leaves of 
elm trees in spring, causing “shot 
holes.” The larvae appear a little 
later and eat the under side of the 
leaves. Spraying with lead arsenate 
should commence as soon as the 
beetles commence feeding, the object 
being to kill as many adults as possi- 
ble and prevent the laying of eggs. 
When the larvae begin to hatch, another application should be 
given, taking care this time to get the poison on the under side 
