Gregson, J. D.

English

Journal of the Entomological Society of British Columbia

6 ENTOMOLOGICAL SOCIETY OF BRITISH COLUMBIA, PROC. (1958), VOL. 55, DEC. 22, 1958 We have done no tes ts with Dia-zinon against the rosy apple aphid, the pear psylla, "cat facing" bugs, or cherry fruit flies, but results from elsewhere indicate that Diazinon is very effective in these cases. References Buxtorf, A., and M. Spindel', editors. 1954. Fifteen years of Geigy pest control. Trans-lated by B. Ireland and R. Truan. Geigy S. A. Basic, Switzerland. Clancy, D. W. 1955. Effects of spray practices on apple pests and their natura l enemies. Mountaineer Grower 25(206) :11-2l. Clancy, D. W. and H. J. ,McAlister. 1956. Selective insecticides as aids to biological con-trol of apple pests. J, Econ. Ent. 49, 196-202. Downing, R. S, 1958. Recent tria ls with new acaricides in British Columbia orchards. Can. J. Plant Sci. 38: 61-66, Geigy Agricultural Chemicals. 1956. Diazinon Technical Bulletin No. 56-\. New York, N.Y. Radeleff, R. D., G. T. Woodward, W . J. Nicherson, and R. C. Bushland. 1955. The acute toxicity of ch lorina ted hydrocarbon and organic phosphorus insecticides to livestock. U nited States Dept. Agr. Tech. Bull. 1122. Washington, D.C. Smith, L. C. 1955. DDT resistant codling m oth. Report on the 1954-1955 control trials. J. Dept. Agr. South Australia 59: 12-15. TICK PARALYSIS IN CATTLE IN BRITISH COLUMBIA IN 19571 J. D. GREGSON2 Entomology Laboratory, Kamloops, B.C. Several serious outbreaks of tick pa ralys is in ca ttle were caused by the Rocky Mountain wood tick, Dermacen-tor andersoni Sti le s, in the Nicola-Kam-loops area of British Columbia in the spring of 1957. These were favoured by prolonged tick activity during a late spring, and by lack of, o r inade-quate, spraying of animals with BRe. Several rain showers a lso se rved to wea ken re sidues that o rigina lly may have been sufficient ly strong to afford normal protection from the ticks. The first outbreak occurred on April 10 a t the J. L aude r ranch , Merritt. Three hundred yearling cattle, which had not been bothered by ticks during the past three yea rs and hence had not been sprayed , became infested with clusters of several dozen engorg ing ticks per animal. Ten were paralyzed in the field; three o f the se died. The remaining animals were rounded up and sprayed the following day with BRC at the I'ecommended rate o f 4 ounces of wettable powder (Ortho BHC 10 Wettable, 10 per cent gamma 1. Contribution Xo. 3826, Entolllolog y Di vision, Sc il'l'I ce Se n -ice, Department of Agriculture , Ottawa, Canada. 2. Entomologist . isome r ; California Spray-Chemical Corporation, Portland, Oregon) per gallon o f water. On April 19, at Drew's ranch, Stump Lake, 32 yearlings in a herd of 118 became paralyzed. The herd, which had been sprayed with BRC wettable powder (O rtho BRC 10 Wettable) at 2 ounces per gallon of water two weeks previously, was res prayed; and st r icken anim als were deticked in the fi eld and each given 600,000 units of penicillin to safeguard against pneu-m onia. Seven animals died, The following day a la rge outbreak was reported by the Nicola Stock Compa ny at w hat is known locally as th e Saxon Field, about six miles up Quilchena Creek. This a rea ha s been heavi ly infested with ticks fo r many years, and in 1944, in a derri s-s prayed herd of 1,230 yearlings, 400 were para lyzed and 50 were los t. In 1957, the herd had been sprayed with BRC, but at on ly 1- ounce of wettable powder (Ortho BRe 10 Wettable) per gallon of wate r, r esulting in little residual protection. When the writer visited the area on April 21, nine cowboys were searching some ten square miles ENTOMOLOGICAL SOC IETY OF BRITISH COL UMBIA , ?ROc. (1958), VOL. 55 , DEC. 22 , 1958 7 Som e o f 120 cat tl e t hat w ere paralyzed by ticks w hile b eing h eld O\'c rnig ht for t reatme nt with BHC. (,f ra nge lancl f () r 200 para lyze d anima ls, !\ lan y o f th e catt le ha d cul-lapsed in c ree k buttum s and uncl e r-],ru sh ancJ \I'e re su ffe ring from ex-pos ure , Th e m o re ach 'anced cases \I'e re compl ete ly imm obili zed ; som e had alrea dy iJ ee n attacked by mag pi es ancl c()vu t es , Ot he r s \I'e r e ab le t() sit u p, ' ('heir he hav i()u rs var ied hum gLts:>y -eyed he lpl ess ness tu c() m pla-cenCI', :\ s th ey ,I'e re c1i sco\'e r ed th e e ng~rgin~ ti l' k s \I e re combed off o r d, ,useclllit h di es e l o ii. :;\ lus t of th e a nim a ls rec()l" e re d by th e fo ll ow ing <1 ;1\', a nd <In ]\, aiJu u t 30 Il'e re lost. T he re;nainin g JOO llnparal yzecl hut hea I'i ly in fested ;lnim a ls \I'e re ruuncl ed u p a nd c1ril'en fu ur mil es to the nea res t co rral. TIl' n ext mornin g . wh e n equipm ent was as sembl ed for BHC spra y ing. 120 o f th ese ha d becom e para lyzed, A ll th es e r eco ve r ed complet ely alth o ugh so m e I\' e re st ill unable to wa lk s teadi ly t\\'O days late r. Two we r e drOll'ned w hil e a tt empting to drink at a n ea rby lake, ]n a dditi on to th e t o ta l an1mal los ses . th e own e r suffe red losses fro m . animal shrinkage du e t o mov ement and lac k of foo d, a nd in wages fo r manpoll'e r. A no t he r (l U tbrea k occu rred a t the 'vV. Davi s ran ch at l\ lam11l 0 t L a k e a ll A pril 26. whe n 14 yea rlings in a h e rd of 70 beca m e a ffec t ed. A ll r eco l'c r ed afte r a n em e rgency treatmcnt o f coal u il a nd crank ca se lJ il , fo ll owed by a ILH C ~ prar. Thi s \I 'a s th e fir s t t ime th;lt thi s ra nche t- had caU le pat'a lyzcd hy tick s durin g hi " l hit,t cc n ycar s of r: ln chin g in thi s ya ll ey. Summary In 19J7. fo ur o utbreaks o f para lys is ()cc urred in catt le from attack s by t he ].«)ck v :\foun ta in wood ti ck , D erlilacen, luI' t1liderSolii S til es . in th e Kaml oops-2\ icola di s tricts o f British Columbia . J n h erd s uf 300. 118. 700 . a nd 70 yea r -lin gs, 10, 32, 320, a nd 14 animals r es pect ive ly were paralyz ed, with losses o f 3, 7. 30. a nd 0 r es pe cti ve ly. The o u tbreak s we r e favo ured by a combination of p rolonge d tick ac tivity a nd insuffi cient pro t ecti on from BHC sprays due tu sho ll'e ry weath e r a nd inad equate cl osage . 

Tick paralysis in cattle in British Columbia in 1957

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Tick paralysis in cattle in British Columbia in 1957

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Journal of the Entomological Society of British Columbia