1994 Guide for control of external parasites of sheep and goats

              Cooperative Extension Service
College of Agriculture and
Home Economics
N EW
M EX IC O STA
E
UNIVERSITY
T
1994 Guide for Control
of External Parasites
of Sheep and Goats
Guide B-112
L. M. English, Extension Entomologist
This publication is scheduled to be updated and reissued 7/99.
To find more resources for your business, home, or family, visit the College of Agriculture and Home Economics
on the World Wide Web at www.cahe.nmsu.edu
Note: Any insecticide preceded by “RU” (Restricted
Use) means all or some uses of this product have
been restricted by EPA. Any applicator must be
certified and licensed before buying restricted-use
products.
GENERAL PRECAUTIONS
DO NOT spray animals in a confined,
nonventilated area.
DO NOT dip animals when thirsty or overheated.
Water animals well before treatment so
they will not drink the vat fluid.
DO NOT contaminate feed or drinking water.
DO NOT apply insecticides to sick animals or
animals under stress.
DO NOT apply insecticides to lambs less than 3
months old, and use light applications
on lambs 3 to 6 months old.
DO NOT treat animals with coumaphos 10 days
before or after shipping or weaning, or
after exposure to contagious or infec-tious
diseases.
DO NOT apply coumaphos, dioxathion, or ron-nel
to animals in conjunction with oral
drenches or with internal medications
such as phenothiazine, or with natural
or synthetic pyrethroids or their syner-gists,
or with other organo phosphates.
DO NOT use coumaphos, dioxathion, or ronnel
on lactating milk goats.
FLEECEWORMS (WOOL MAGGOTS)
Docked and tagged sheep are not usually both-ered
with fleeceworms.
Even in well-managed flocks, fleeceworms
sometimes become a problem during a long
stretch of cool, damp weather. Spraying the rear
ends of the sheep is a good control and preventive
measure under such conditions. High-pressure
sprays (150–250 lb pressure) are best; however, if
a low-pressure sprayer (50–150 lb pressure) is
used, be sure to add 1–2 lb of household detergent
per 100 gallons of water. For control, see table 1.
Coumaphos (Co-Ral). Use a 0.125% solution
made by mixing 4 lb of 25% Co-Ral wettable
powder in 100 gal of water, or 2 oz in 3 gal of
water.
(RU) Dioxathion (Delnav). Use a 0.15% solu-tion
made by mixing 2 qt 30% Delnav livestock
emulsifiable concentrate in 100 gal of water, or 4
tsp in 1 gal of water.
Ronnel (Korlan). Use 2.5% ronnel livestock
bomb. Spray infested area and a 3-inch band
around the margin.
Restrictions: Coumaphos requires a 15-day
preslaughter interval. No preslaughter is required
for dioxathion or ronnel; however, DO NOT use
dioxathion more than once every 2 weeks.