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dependent on ingestion of any of
• this material by the fly. For this reason, it is highly important that a good, uniform deposit of the in • secticide be achieved, either on bam wall or on the hide of the animal. Hand sprayers, in general, are not effective. Enough pressure must be applied to drive the insecticide un der the hair, in the case of spraying cattle, or to plaster the material against the wall, when barns are being treated. In addition, all approved residual This chart of livestock insect control recommendations is intended for ouick reference onlv. Before poing ahead with any livestock insect control program, see your county agent and obtain all of the information as it applies to your particular problem. Prepared by the office of the state entomologist. Control of Livestock Insects :lO Name of Insect or Mile When to Treat Special Conditions Control INSECTS ON RANGE CATTLE Spray grubby area once with 400 to 600 P.S.I., then massage back with a dull hoe and spray the same area again. See Montana Extension Circular No. 222. First spraving just prior to the emer gence of the first grubs from the back. Second spraying 50 to 60 days after the first spraying. Spray; IVz pounds of 5% Rotenone powder (not liquid or powder made from spraying liquid on a dust), 100 gallons water, and 1 pound of Tide or Dreft CATTLE GRUBS Dipping is more effective than spray ing. When spraying use 300 to 400 P.S.I. and cover all parts of the animal's body so as to wet the hair coat clear through to the hide. See Montana Extension Circular M-221. Dip or Spray; 1/30 of 1% mixture of gamma isomer of either crude Benzene Hexachloride or Lindane (1 pound of 25% gamma isoifier wettable powder to 100 gallons of water). Use wettable powders only. CATTLE LICE In the falL First spraying when first flies appear in the early summer. Repeat sprayings every 3 to 4 weeks through fly season. A fairly thorough spraying usually Spray: % of 1% DDT either emulsion gives a longer residual effect. See or wettable powder. (8 pounds of 50% USDA Leaflet No. 270. HORN FLIES DDT wettable powder to 100 gallons of water.) Look for ear ticks in the early spring and spray when they are found. Ex amine animals every two weeks after spraying and repeat treatment when necessary. Spray: Vz of 1% Toxaphene either emulsion or wettable powder. (18 pounds of 25% Toxaphene wettable powder to 100 gallons of water.) Cover tick^nfested area with the spray. See USDA, BE&PQ Circular EC-10. EAR TICK INSECTS ON DAIRY CATTLE Same as range cattle above or use a hand wash. See Montana Extension Circular No. 222. Spray: Same as range cattle above. Hand Wash: 1 pound of 5% Rotenone powder (n6t liquid or powder made from spraying liquid on dust) to 5 quarts of water. CATTLE GRUBS Same as range cattle above. Spray: Same as range cattle above, ex cept use Lindane only. For spraying, same as range cattle above. Hand dusting may be used effec tively. See Montana Extension Circular Dust: 1% Lindane, 1% Rotenone, or a Pyrenone louse dust. CATTLE LICE In the fall or when needed. tà-221. Spray on Cattle: % of 1% Methoxychlor (8 pounds of 50% Methoxychlor wet table powder to 100 gallons of water), or Pyrenone diluted according to direc tions on the label. Spraying is supplemental to good sani tation practices, it will not replace these practices. See USDA, BE&PQ Leaflet No. 283. First spraying at the start of the fly season and repeat every 2 to 3 weeks or as often as is needed. HOUSE AND HORN FLIES Spray on Inside of Dairy Barn: % of 1% Lindané (16 pounds of 25% Lindane wettable powder to 100 gallons of wa ter). Do not allow spray to contact feed, feed boxes, watering equipment or milk processing equipment. Spray: Pyrenone mixed in accordance with directions on the label (mix 1 part of an emulsion concentrate con taining 1% of pyrethrins and 10% of piperonyl butoxide with 9 parts of water). Spraying is usually ineffective unless fresh manure, wet straw and moist trashy areas are eliminated. See USDA, BE&PQ Leaflet No, 283. First spraying when the first flies ap pear and repeat as often as is needed. STABLE FLIES INSECTS ON SHEEP Dipping is better than spraying. See Montana Extension Leaflet M-l. SHEEP TICK Dip or Spray: 8 ounces of 5% Rotenone powder to 100 gallons of water. In the falL INSECTS AND MITES ON HOGS Spray: 0.12% Lindane (4 pounds of 25% Lindane wettable powder to 100 gal lons of water) or 0.25% Chlordane (5 pounds of 40% Chlordane wettable powder to 100 gallons of water). In the fall, or when needed. If a second Thoroughly spray all of the animal treatment is needed, spray 10-14 days with enough pressure to wet through to after the first treatment. HOG LICE the hide (usually 250 P.S.I. is enough). Good sanitation must be practiced in addition to spraying. Spray in same manner as for hog lice above. HOG MANGE Same as hog lice above. When needed. INSECTS ON HORSES Dust all parts of the animal, rubbing " the dust in to the hide. Dust: 5% or 10% DDT dust HORSE LICE When needed. * materials are wettable powders, which means that sprayers equipped with agitators in the spray tank are desirable to keep chemicals in sus pension. Knapsack sprayers, if used, should be upended from time to time to agitate the spray mixture. In bam spraying, all feed, man gers, watering cups and milking equipment should be covered to pro tect them from insecticide deposits. A galion of spray per 500 square feet will treat most barn surfaces to the point of run-off. Bams should not be sprayed within a week after white washing since the insecticide will npt remain effective on top of fresh whitewash. The amount of deposit visible on walls from the last spray application is no indication that the insecticide is still active, as this may be merely the inert ingredients in the wettable powder. In general, it is felt that too many dairymen concentrate on the interior of the barn and neglect the exterior. Keep dairy cows comfortable at all times. Plane Insurance Ruling Modified MONTANA FLYING farmers need not carry liability insurance to spray or dust their own cropland. This modification of the Montana Aero nautics commission ruling on aircraft operators' insurance was made re cently at the request of the Montana Flying Farmers and Ranchers Assn., according to Louis G. True, secre tary.