ts , Farmers’ Bulletin 1206. 
(3) In case the infestation is beyond control the crop should be 
cut for hay immediately. The ground should then be well culti- 
vated so as to expose the pupz to the hot sun and to their natural 
enemies. 
(4) When the caterpillars are on the march, or are starting in one 
corner of a new field, stop their onward march by plowing a deep 
furrow around the infested area. Care should also be taken to see 
that the furrow is kept free from rubbish. 
(5) Asa spray for vetch and other forage crops use any one of the 
following mixtures: 
(a) Arsenate of lead (powder form) —----—----____ pound__ 1 
Waiters: ions ssa ee en gallons__ 50 
(bo) Arsenate of lead (paste form)_— -—_-___-_____ pounds__ 2 
Witter 2 2 ee eae Ss ee gallons__ 50 
As aspray for corn use a stronger solution : 
(a) Arsenate of lead (powder LORIN Ese eae oe ee pounds__ 2 
AWW Ceaser ele ene ee et ee eee ee gallons__ 50 
(0) seArsenater ot, leadaa (paste siorm))/ === === ea es pounds__ 4 
YU TIS) pease os 2 a ly Set eI he cs at gallons__— 5O 
(6) In dusting use one of the following insecticides: 
(a) Calcium arsenate. Undiluted if analysis shows hot over 
three-fourths of one per cent water-soluble arsenic, and diluted 
with lime if analysis shows over three-fourths of one per cent 
water-soluble arsenic. 
(b) Arsenate of lead (powder form). 
(c) Paris green 1 pound; lime, freshly slaked, 4 pounds. 
(7) Poisoned bait is scattered broadcast over the infested fields. 
Make this up according to the following formula: Wheat bran 50 
pounds, Paris green or white arsenic 1 pound, cheap molasses 2 
gallons, water 3 to 4 gallons, and add 6 finely chopped oranges or 
lemons to the mixture. 
Caution: Care should be taken not to pasture stock on crops that 
have been sprayed or dusted with poison miatures until rains have 
removed all traces of the poisons. 
