Development of a low-dose fipronil deer feed: evaluation of efficacy against two medically important tick species parasitizing white-tailed deer (Odocoileus virginianus) under pen conditions

Table 4 Fipronil deer feed efficacy in reducing Ixodes scapularis and Amblyomma americanum survivorship

Test group	FDF exposure time (h)	Days post-exposure for tick challenge	Mean live females/deer by day 8 after ticks introduced^a	Treatment efficacy (%)
Ixodes scapularis
T48	48	Day 7	0.25 ± 0.50	96.2
T48	48	Day 21	3.50 ± 3.70	47.2
T120	120	Day 7	0.00 ± 0.00	100
T120	120	Day 21	0.50 ± 1.00	92.5
Control			6.63 ± 5.78
Ambloymma americanum
T48	48	Day 7	1.50 ± 2.38	89.7
T48	48	Day 21	2.50 ± 3.70	82.8
T120	120	Day 7	0.00 ± 0.00	100
T120	120	Day 21	1.75 ± 2.87	87.9
Control			14.50 ± 4.66

^aIncludes attached and detached females alive at day 8 post-attachment. Values are the average ± SD

ISSN: 1756-3305