4.--_Hand-picking_ is usually very effective, and if performed as
follows, not very disagreeable: Fasten a small tin can securely to a
wooden handle and fill one-third full of water and kerosene; make a
small wooden paddle, with one straight edge and a rather sharp point;
by using this in the right hand and the pan in the left, the bugs may
be quickly knocked off. Be sure to destroy all eggs when hand-picking
is used.
5.--_Kerosene emulsion_ is used in varying strengths; for method
of preparing, see Chapter XVII.
6 and 7.--For use of whale-oil soap and miscible oils, see Chapter
8.--_Tobacco dust:_--This article varies greatly. Most sorts are
next to worthless, but a few of the brands especially prepared for this
work (and sold usually at $3 per hundred pounds, which will last two
ordinary home gardens a whole season) are very convenient to use, and
effective. Apply with a duster, like that described in Implements.
9.--_Carbolic acid emulsion:_--1 pint crude acid, 1 lb. soap and 1
gal. water. Dissolve the soap in hot water, add balance of water and
pump into an emulsion, as described for kerosene emulsion.
10.--_Corrosive sublimate_ is used to destroy scab on potatoes for
seed by dissolving 1 oz. in 7 gals, of water. The same result is
obtained by soaking for thirty minutes in a solution of commercial
formalin, at the rate of 1 gill to 15 gals. of water.
11.--_Bordeaux mixture:_--See Chapter XVII.

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