-99- 
Spraying during the height of the oviposition period of the 
second generation caused a measurable reduction in the number of 
infested tips where a rotenone or a EN spray was used, but no re- 
duction where a pyrethrum spray was used.— Tflhit comb (680 , p. 38) • 
Dasyneura vaccinii Smith, a cranberry tipworm 
Preliminary tests indicated that this pest oan be controlled 
by rotenone sprays •—Crowley (128) • 
Diarthronomyia hypogea (Loew) , the chrysanthemum gall midge 
The time of day at which nicotine or rotenone-pyrethrum sprays 
were applied appeared to have little significant difference on the 
degree of control secured, although sprays applied after 2 were 
slightly more effective than earlier applications*— Hasten (152 ) . 
Mycodiplosis alternate Felt, dogwood club gall midge 
Four applications of sprays containing 4 pounds of rosin resi- 
due emulsion and 4 pounds of cube powder per 100 gallons of water 
appeared to be effective*— Felt and Bromley (178 ). 
Huscidae 
Hylemya brass icae (Bouohe) , the cabbage maggot 
Powdered derris root had no influence on the amount of maggot - 
injury.— Glasgow ( 232 ). 
(Haematobia ) Siphona irritans (L.), the horafly 
Rotenone, administered by mouth to stock, was the most effec- 
tive material tested; when given to cettle daily at the rate of 0.4 
gram per 100 pounds of body weight of the animal, it killed all the 
fly larvae in the droppings. It had no apparent harmful effeot on 
the cattle.— Bruce (93 , 94 ) 
It is possible to administer certain chemicals orally to cattle 
which render the droppings unsuitable for th© development of horn- 
fly larvae* but this method has not reached the practical stage. Ef- 
fective materials include rotenone (0.4 gm. per 100 lb. of body 
weight), zinc oxide, and phenothiasine.— Thomssen and Doner (591 ) . 
"When pyrethrum or rotenone sprays were applied to animals to 
control the hornfly, the toxic action persisted almost undiminished 
for at least 7 hours.— U. S. Bureau of Entomology and Plant Quaran- 
tine (623, p. 94). 
