After the plants begin to head, pyrethrum or salt water may be used.
Sialagogues, as mercury internally, and pyrethrum externally.
pyrethrum or buhach may be used in similar manner, and kerosene emulsion has been highly recommended by some experimenters.
How anything can be gay with pyrethrum uliginosum I cannot imagine.
There are very few data at hand concerning the discovery of the insecticide properties of pyrethrum.
Still, to anyone with but a slight knowledge of hardy plants, it asserts itself at once as a pyrethrum.
Prof. Riley states that the insects are very readily destroyed by pyrethrum.
At the present time the pyrethrum flowers are considered by far the most valuable product of the soil of Dalmatia.
The pyrethrum may be used dry or in water, at the rate of a tablespoonful to two gallons.
A bushel of pyrethrum powder would not pepper them all or a hogshead of kerosene emulsion last long enough to get them all.