Show va lice inflict heavy damage on cattle DDT treatment cuts high winter infer losses lice are injurious to all types oi of cattle animals produce less meat meal and milk if 11 uce lice are unchecked young animals and poorly nour dished old animals suffer most from uce lice the winter season Is the time lice are bad on cattle the louse population builds up then dr harold gunderson extension entomologist at iowa state college says one louse unchecked in fail all means 1000 the following march for lice control on cattle DDT Is 19 being used successfully early in fall before cold weather arrives it is mixed with water and sprayed on the animals after cold weather comes a DDT dust is recommended farmers are being advised to use a dust containing 10 per cent DDT some of the powdered louse killers on the market contain less than 10 per cent DDT but have other effective insecticides combined with the DDT the rotenone dusts recommended tor for cattle grub control can b be e used lor for uce lice control usually they are diluted lor for uce lice to cover greater area and reduce the cost for instance one pound of a cattle grub dust containing idt 1 per cent rotenone can be mixed with two pounds of flour to make an effective I 1 louse ouse killer |