Leaf Lice and Thrips. 439 
spray or by hand-picking. ‘The numbers of worms can be re- 
duced by killing the large moths, which are abundant at night- 
Caterpillar of Swallow-tail Butterfly. 
fall on beds of verbenas, or other garden flowers. These worms 
are related to other large caterpillars which feed on tobacco, 
tomatoes, etc. 
Leaf-Eatng Beetless—There are many beetles, large and 
small, which infest grape leaves. They can all be reduced by 
the use of Paris green, or those which drop to the ground when 
disturbed may be collected in large numbers on sheets spread 
below. 
INSECTS UPON BARK OR SURFACE OF LEAVES OR FRUIT. 
Leaf Lice—Leaves of fruit trees, especially the apple an1 
plum, are sometimes almost covered with lice or aphides of dif- 
ferent colors, from light green to black, some individuals having 
wings and some wingless. Available remedies for all these leaf 
lice are the resin wash and the kerosene emulsions which will 
be given later as summer washes for scale insects, with a spray 
nozzle which sends spray upwards, so as to reach the under sides 
of the leaves. Very often these pests are effectually cleared out 
by lady-birds and other insects which devour them. The en- 
graving shows the general form of the aphis tribe. 
The Aphis or Leaf Louse. 
Thrips——Very minute insects infesting leaves of pear, 
causing them to wither and fall off—the leaves usually being 
covered with black dots. Remedies the same as for leaf lice. 
Vine Hoppers.—Very minute, yellowish, jumping insects 
infesting grape-vines very early in the season, and multiplying 
