Nicotine Dust for Truck-Crop Insects. 23 
The dust is sometimes disagreeable to the operator, especially if the 
latter is inexperienced in applying it. 
It can not be combined with Bordeaux mixture, except when the 
latter is dry. 
It can not be applied satisfactorily in windy or cold weather. 
Its present cost 1° per pound is high. 
Fic. 14.—Two types of hand-operated dusters used in an infested pea field: At left, fan 
type; at right, bellows type. 
SUMMARY. 
For controlling certain truck-crop insects nicotine dust has several 
advantages over a liquid spray of nicotine sulphate. Dusting re- 
quires much less weight of material per acre, and may be done in a 
much shorter time with a lighter and less expensive machine, and in 
most cases at less cost. The tiny particles of dust reach many 
insects inaccessible to sprays. 
Nicotine dust is nicotine-sulphate solution mixed in correct pro- 
portion with a dust carrier. Lime alone is ordinarily used for 
the carrier, but the addition of sulphur to the lime makes the . 
material more effective against most insects. 
Nicotine dust kills the insects by paralyzing the nervous system 
almost immediately. The application should be thorough in order 
that the dust may come in contact with as many insects as possible. 
Dust may be applied with hand dusters for small acreages, horse- 
drawn outfits for larger acreages, and power-operated outfits for 
extensive acreages. 
In the year 1922. 
