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Hypodermat idae 
Hypo derma lineatum (De Vill.), the common cattle grub 
H. bovis (L.), the northern cattle grub 
In Ashland County, Ohio, 23 insecticide formulations were tested on 9k 
animals for cattle grub control. A mixture of 5 percent chlordane and 95 
percent linseed oil gave 5^*5 percent mortality; a mixture of 5 percent 
chlordane, 5 percent water, and 90 percent lanolin gave 91*9 percent mor- 
tality. —Telford (TO). 
Emulsions and wettable powder sprays containing up to 1.5 percent 
chlordane, applied as a wash and with a high power sprayer, caused less 
than 20 percent mortality of the cattle grub larvae. Dusts containing up 
to 5 percent chlordane also proved ineffective. — U. S. Bur. Ent. and Plant 
Quar.~ 0+68): Bishopp and Knipling Qi±). 
A spray containing 4 pounds of 50-percent wettable chlordane per 100 
gallons of water and a spray containing 1 gallon of 15-percent emulsifiable 
chlordane concentrate per 100 gallons of water, were ineffective. The 
sprays were applied at 350 to 400 pounds pressure. — ]Purman and Douglass ( l6l ) . 
Preliminary laboratory work indicated that a 1.5 percent suspension of 
chlordane prevents the eggs from hatching. A spray containing 2 percent 
chlordane (as a wettable powder), applied k times at 2-week intervals to 
cattle, resulted in an average of 12.2 grubs per animal being removed as 
compared to 39.9 in the untreated check. Jhe insecticides were applied 
with a power sprayer at a pressure of 300 pounds per square inch. Special 
care was taken to see that the entire surface of each cow's body was wet 
to the skin and an average of 5 gallons of spray material per animal was 
used. Three of ten cows sprayed with chlordane died after the fourth 
application and this treatment was discontinued.-- Graham ( 192 ). 
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Muse idae 
Hylemva ant i qua (Meig.), the onion maggot 
The common onion maggot, and the black onion fly, Trltoxa flexa 
Weidemann, were controlled successfully during 19^ in Minnesota by chlor- 
dane in large field plots of commercial onions and in the laboratory. — 
Granovsky ( lft^ ). 
Hvlemya brassicae (Bouche), the cabbage maggot 
At Corvallis, Oregon in 19^7 a 5-percent chlordane talc dust applied 
to the soil at the rate of 27.5 pounds chlordane per acre was ineffective 
in preventing maggot injury to radishes, kohlrabi, broccoli, mustard, and 
rutabaga. — Crowell e_t al . (91 ). 
