328 Gardening 
mustard and may be destroyed. In this way crops of 
cabbage are protected in spring. In the autumn late 
crops of mustard will attract the bugs at times when 
other food may be scarce. 
(3) Clean culture. The advice given for clean culture, 
under methods of combating the common squash bug, 
will be helpful also in keeping the calico bug under 
control. 
Gardeners living in the zone just north of the present 
range of the insect should keep a sharp watch for its 
appearance. Determined efforts should be made to pre- 
vent its further spread. 
THE BURROWING INSECTS 
The larve of many insects live within the plant and 
cannot be killed in their feeding stage by poisons or 
sprays. To combat them it is necessary, therefore, 
to keep the adults from laying eggs among the plants, to 
destroy them when they are outside the plant, or to 
remove them from their tunnels by hand and kill them. 
Several kinds of burrowing insects are troublesome to 
garden plants, and some of these are often very injurious. 
The radish maggot. The roots of radish and cabbage 
plants are attacked by “‘ maggots,”’ which eat grooves in 
them or even tunnel into the inside. Young cabbage 
plants may thus be killed, and infested radishes are 
stunted and made worthless as food. 
The adult of this maggot is a fly (somewhat smaller 
than the common house fly) which appegrs in the spring. 
It lays its eggs in the soil, usually near plants of the 
radish or the cabbage, and the eggs. hatch in from 3 to 
