Show cattle cantli grubs grabs do much damage entomologist says kC cattle attle grubs now occurring throughout utah are seriously damaging the backs of cattle in many communities arans dr Q G F P knowlton utah extension entomologist as lie he urges farmers to give serious consideration to this problem affecting beet beef and dairy cattle infestation by cattle grubs reduces milk yield retards regards growth and fattening of beet beef cattle reduces the value of hides and of meat ineat carcasses and requires trimming an average of two pounds per carcass from grubby animals says knowlton this results in lower prices paid fir beet beef and veal animals coming from grub infested areas reduced deuced milk yield results in every infested herd in every milk cow also when hot flies are chasing the catle in the fields milk reduction of 10 to 15 16 per cent often occurs he added th the e grubs are best controlled by a rotenone ret enone spray or dust in case of community action or treatment of large r range a n g 0 herds use of a cattle chute and a power sprayer are most eco jio n 0 mical the cost coat of rotenone and sulphur spray for three power sprayer treatments is approximately five to seven cents per animal per year the entomologist estimates best time tor for the first treatments is approximately 25 days after the first grubs appear in the backs of the cattle with two later treatments 30 to 60 days respectively after the first occurs to destroy all grubs reaching the back vy in small herds control may be effected by means of a dust mixture consisting of aroud cube or derris root five per cent rotenone content one pound mixed with four pounds of lite when thoroughly mixed place in a shaker can with a tight lid in the top of this make IS 16 holes each one quarter inch la in diameter luched outward TWO men working on both sides of a chute shaking dust over the tho backs of each of the cattle can treat from 76 to animals in and hour |