100 
oats or corn. Their effect will be only to delay and distribnte 
the migration of the brood, possibly resulting also in the starva¬ 
tion of the younger individuals. 
15. Encouraging spring growth of volunteer grain on ground 
to be used for coru, or other late-planted crop. Late spring plow¬ 
ing of this ground preparatory to planting will destroy the eggs 
and young with which it will probably be stocked. 
16. Irrigation of the infested fields, where it is possible, is, of 
course, a complete remedy. 
B. BARRIERS AGAINST MIGRATION. 
1. Planting strips with crops not subject to injury by the chinch 
bug, as described above under No. 14. This, to prevent the 
speedy migration of insects of the spring generation from fields 
of wheat and oats at harvest. 
2. Plowing and harrowing at harvest time around infested 
fields, for a similar purpose. 
3. Plowing one or two deep furrows around the field. “The 
earth should be thrown awny from the protected field, and the 
furrow not allowed to settle or harden, but be kept friable or 
dusty by dragging a log or stone or a bundle of brush along it each 
morning. The philosophy of the plan is that the bugs cannot 
climb up the loose surface, especially on the perpendicular side. 
The dragging each morning will kill many, but they should be 
either trapped or destroyed in pits, or burned by strewing straw 
each morning on the invading side of the furrow, and burning 
the same each evening, when a chinch-bug holocaust will result. 
—Biley. 
4. Pouring coal tar along the ground just outside the borders 
of infested fields, as recommended by Dr. LeBaron in his second 
report. “This method,” he says, “has been extensively resorted to 
the past season (1871) in the central part of the State. I had an 
opportunity of seeing it put in practice, on a large scale, on the 
farm of Mr. Joshua Sells, of Bloomington. At the time of my 
visit, Mr. Sells had adopted the plan of running a stream ot tar 
from the spout of an old tea-kettle directly upon the ground, along 
the exposed sides of his corn fields. He found that a gallon ot 
tar would extend about ten rods, so that a two-gallon kettle, twice 
filled would furnish a strip of tarred ground the whole length ot 
a forty-rod corn field. The tar had to be renewed every other 
day, and oftener in case of rain. The insects would crowd up to 
the’line in such numbers that in many places they would pile up 
from half an inch to an inch deep, and could be scraped up by 
the double handful. But so long as the tar was kept fresh, not a 
bug w r ould cross it. They were *not prevented from ciossing y 
the adhesive nature of the tar, but by its repulsiveness. The bugs 
would not touch it. They were destroyed by conducting them into 
perpendicular holes, or by shoveling them in and burying them. 
