270 PESTS OF ORCHARD AND SMALL FRUITS 
They have a habit of traveling back and forth up and down the trunk 
and limbs of a tree, and sometimes collect in masses. 
On orchard trees they are readily controlled by poison sprays, 
preferably arsenate of lead. 
The Yellow-necked Caterpillar (Datana ministra Dra.) 
In late summer 
yellow and black 
striped caterpillars 
feed on orchard 
foliage, working in 
colonies and strip- 
ping a single limb 
as they go. The 
mature caterpil- 
lar is nearly two 
inches long. Just back of the head is an orange ridge. When dis- 
turbed, the caterpillars raise both head and tail into the air, holding 
fast by the middle. 
The eggs are laid on 
Fic. 380. — The Yellow-necked Caterpillar. Original. 
the leaves in midsum- 
mer, by a_ brownish 
moth. Winter is passed 
as a pupa in the soil. 
There is one generation 
annually. 
Removal of the colo- 
nies of caterpillars by 
cutting off the trig ot Fic. 381.—Adult of the Yellow-necked Cater 
limb is the usual pro- pillar. Original. 
cedure. They may easily 
be killed by spraying with Paris green or arsenate of lead. Where 
orchards are given a spraying with arsenicals the first of August this 
pest will not be in evidence. 
