186 MANUAL OF GARDENING 
danger from any insect or disease that is controllable 
by spraying. 
Screens and covers. 
There are various ways of keeping insects away from plants. 
One of the best is to cover the plants with fine mosquito-netting 
228. A truck-mounted barrel hand spray 
pump. 
insects to hatch all the sooner. 
or to grow them in hand- 
frames, or to use a wire- 
covered box like that shown 
in Fig. 229. In growing 
plants under such covers, care 
must be taken that the plants 
are not kept too close or con- 
fined; and in cases in which 
the insects hibernate in the 
soil, these boxes, by keeping 
the soil warm, may cause the 
In most cases, however, these 
covers are very efficient, especially for keeping the striped 
bugs off young plants of 
melons and cucumbers. 
Cut-worms may be kept 
away from plants by placing 
sheets of tin or of heavy 
glazed paper about the stem 
of the plant, as shown in Fig. 
230. Climbing cut-worms are 
kept off young trees by the 
means shown in Fig. 231. 
Or a roll of cotton may be 
placed about the trunk of 
the tree, a string being tied 
on the lower edge of the roll 
vl 
20. Wire-covered box for protecting 
plants from insects. 
