30 Contagious Diseases of the Chinch-bug. 
In places along the ridge where the soil is moist, so that the chinch-bugs can | 
readily climb up, they cross the salt line. The salt line was in good condition, ! 
but the odor of kerosene was almost gone from it. Thekerosene was accordingly 
renewed by pouring a small stream from the can over the salt line. ost 
June 16. On the southwest corner a good many bugs have crossed the ridge, e ul 
not in damaging numbers, but enough to show that salt and kerosene are not a 
sufficient barrier at all times. In the furrow next to the ridge quite a number of 
larvee in different stages were dead from the heat of the soil and exhaustion as — 
they tried to climb up the dusty sides of the ridge. The wheat is still so green 
that the bugs need not leave the field on account of a lack of food. They are ~ 
crossing the line a little. I renewed the line with salt and oil, using in all 190 
pounds of salt and three gallons of oil; this was supplied from a pail by hand. Q 
This checked them somewhat, but they still crossed in the southwest corner. © 
June 17. Bugs crossed the salt and oil in southwest corner, and in places _ 
where the ridge was not too steep and dry for them to climb. Although the 
wheat was yet uncut, the bugs climbed over to such an extent that it was thought — ei 
best to use coal-tar. This stopped their march at once. The amount used was 
two bucketfuls, which went around the entire ridge. Many of the young bugs 
died in trying to climb up the side of the ridge. 
June 18. Bugs moving toward the ridge, but not crowding. 
June 20. Bugs not moving any more. Rain. Renewed the line by a very > 
small stream of tar. 
June 22. Wheat uncut, but ripe. Rained in the morning. About half an 
hour after the rain had stopped and before the sun came out bugs were trying to — 
cross the ridge, being especially thick at the corner or angle. A few seemed to ~ 
have crossed the barrier. Tar was renewed, and trains of tar laid to guide them 
into the post-holes. The migratory bugs are in the black and brown larval stages _ 
principally. Some bugs are on the corn beyond the barrier. 
June 24. Bugs numerous, and trying to cross the barrier. Though the tar | 
has not been renewed since the 22d, but few bugs get across. Bugs dropping 
into post-holes; also crawling out again. Fixed this by running a small stream of 
tar along the inside next to the top. 
June 25. Rained in the morning. Bugs not moving much. Rained in the 
afternoon. I cleaned post-holes out and renewed the tar, using a very small 
- stream, which took about an hour’s work. 
June 26. Heavy rain all day. 
June 27. Renewed barrier with small stream of tar; bugs not crossing. Bar- 
rier stood the rain, being washed but little. 
June 29. Bugs moving but little; only a few on the ridge. 
July 1. Considerable rain in the forenoon. Ridges have stood the water well; 
a very thin stream of tar was used. 
July 2. Afternoon sunny and hot. Bugs very abundant on the ridge. Re- 
newed by a very small stream. 
July 3. Wheat cut. Bugs not moving any faster. Grass in wheat stubble 
very green, and in this the bugs are molting, as they have been for the last fif- _ 
teen days. y 
July 4. Bugs are still crawling on the ridge, but none are going over. Re- — 
newed southwest corner. None of the bugs are going into the holes, as they are 
not thick enough to crowd each other in. 
July 5. Renewed line by a very small stream of tar; bugs were crowding over a 
in some places where the ridge had been washed out in the small ravine, and the (ee 
tar had been placed on the level ground. 
