38 
NORTH AMERICAN FEVER TICK AM) OTHER SPECIES. 
cattle of ticks and the pasture-rotation system (to be used in con- 
junction with the former) for freeing the pastures. 
In the feed-lol or soiling system the basis is the time occupied for 
development on the host in connection with the time from the drop- 
ping of engorged females to the hatching of seed ticks from eggs 
deposited by them. In a tick-free inclosurej as a feed lot, cattle 
may be left to drop their ticks until it is time for the eggs from the 
first-dropped individual- to hatch. Information as to exactly when 
ii will be uecessary to move the cattle to avoid reinfestation is given 
in Tables I and II, which show the numbers of days at different seasons 
Ix !'<>re ticks begin to oviposit after dropping and the time before the 
first eggs deposited will hatch. In July, 1906, for instance, this was 
from 25 to 27 days. The time required for all ticks to drop from 
cattle, which indicates how long they must remain in one or more 
tick-free areas, is shown in Table VII. The period is from 31 to 59 
<la\ S. 
The data necessary" for an intelligent/ plan of freeing pastures, by 
removing the cattle until the death of the ticks, are given in Tables 
A" and VI, showing the period from dropping to the death of all the 
resulting seed ticks. The former table shows that if cattle were 
removed from a pasture on June 20, 110 days later it would be per- 
fectly safe to consider it tick-free. 
The data referred to above, together with the results of other 
experiments, have been arranged to cover maximum preoviposition 
and maximum oviposition periods, for convenience, in Table VIII. 
Table VIII. — Periods in the life history of the cattle tick upon which means of control 
are based. 
When ticks dropped. 
Sept. 2. 
Do. 
Dec. 24. 
Dec. 25. 
Mar. 20 
Apr. 19 
Apr. 21 
May 1. 
May i. 
May 19 
May 2] 
June 3. 
June 4. 
June 6. 
Do 
June 12 
June 13 
July 1. 
July 13 
Do 
1905. 
Period from dropping Minimum Maximum 
to oviposition. „. . period from periodfrom 
- iSXtffii dr ?Fck?fo° f:S - d — ^' dr °^^ 
Minimum. Maximum. P ori ° l1 - hatching 
all dead. 
Duns. 
Days. 
9 
10 
5 
6 
5 
6 
ii 
10 
6 
in 
4 
6 
4 
6 
3 
5 
3 
.' 
•"> 
3 
5 
:< 
-1 
:•! 
-1 
3 
5 
.3 
1 
:; 
' 
Dai/s. 
Dans. 
.", 
13 
5 
56 
59 
11 
54 
7.". 
11 
•17 
68 
■11 
47 
10 
39 
18 
6 
33 
S 
6 
2? 
27 
28 
27 
27 
28 
21 
22 
22 
23 
24 
.lime 22 
May 31 
Aug. IN 
Aug. 17. 
A ue. 22 
Aug. 28 
S( pt. 20 
< >ct . 7, 
do... 
34 Aug. 9 
31 S 
31 Sept. 22 
:;i Aug. 17. 
26 Aug. 26 
26 \ 
26 Oct. 6 
Sept. 26 
25 ...do..: 
i« i. 20 
: eb. is 
27 Jan. 23 
adult tO 
death of 
seed ticks 
Dayt 
293 
271 
248 
240 
mi 
17,-1 
167 
17,7 
130 
124 
73 
a 61 
121' 
L06 
107, 
a 111 
194 
a These licks were kepi in open-bottom test tul I i sun at all times. 
