HINTS ON RAISING FARM CROPS 55 
the leaves, which the potato bugs feed on. The 
result is, that the bugs are sufficiently poisoned 
to cause their death. Usually one application 
is not enough, as there are sometimes two or 
more different broods during the same season. 
One can usually tell when another brood is 
coming, however,~as the eggs are usually laid 
in yellow clusters on the under side of the 
potato leaves. When Paris green is used, care 
must be taken that too much of this is not 
used, because the leaves will be seriously 
burned if the solution is too strong. 
The leaf hopper is a more recent pest. In 
fact, many farmers are not yet acquainted with 
this small insect that flies about among the 
leaves, sucking the sap from the under side of 
the leaves. These leaf hoppers are small green 
colored flies, very quick of action. When they 
suck the sap from the leaves or vines, one 
might suspect that the plants are subject to 
“hopperburn.” The tip of the older leaves 
will turn brown, giving the appearance of 
hopperburn. Gradually, however, the outside 
margin of the entire leaf turns brown, leaving 
a small portion of the mid-rib, still green. Be¬ 
cause of the fact that these insects are equip¬ 
ped with piercing mouth parts, they do not 
chew the leaves, but insert their beak into 
the leaves and extract the sap. Hence, it is 
difficult to control this kind of an insect with 
stomach poisons like that applied for the po¬ 
tato bug. The best method of control for leaf 
hoppers is the Bordeaux spray, which prevents 
the large number of eggs laid on the leaves 
from hatching. 
