NICOTINE DUST FOR CONTROL OF vers CROP 
INSECTS. 
Roy E. CAMPBELL, 
Assistant Entomologist, Truck-Crop Insect Investigations, Bureau of 
Entomology. 
CONTENTS. 
Page. Page 
Reasons for adopting nicotine dust _ 3 | Types of dusting machinery________ 10 
Wihttels: nicotine, Gust ?ii- 2- = = 3 aT ONG Stes aus — _ ence ah ee 10 
How to prepare the dust_________- 4 Horse-drawn dusters __________ 12 
Combinations of nicotine dust with Power dusters. 2524.2 ' 25 eye ets 12 
other insecticides and with fungi- itievan elon caphist= 2s. >" Se ae Se 14 
CIC Ee ae ne aE eed i egret ie 6 | The cabbage aphis_________ org arte 15 
Action of nicotine’ dust-—22— . 222 Wel che pearaphis ss — sss 2) ys see saree 16 
ime sot applicaion=—=— = = see Se eiphe- Onion shrips 2s ee ae 19 
NWumber-of applications. == = —_- —__— 8 Cucumber beetles af 2. 2 See See 21 
Strength of nicotine to use________ Se pOrherhinsectss =? Pas tea sees ee eee 22 
ItasseOtenorenei hs Sa ee 9 | Disadvantages of nicotine dust____~ 22 
PSUR y= eee es ee ee 23 
REASONS FOR ADOPTING NICOTINE DUST. 
N INSECTICIDAL DUST has several advantages over a liquid 
spray. It can be applied much more easily and quickly than 
a spray, and a dust hopper can be refilled in much less time than 
a spray tank. The dust particles reach more insects than the spray, 
particularly on the undersides or in curled leaves. Power dusters 
cost less than power sprayers, while hand dusters are easier to carry 
and to operate than hand sprayers. Usually much less than 100 
pounds of dust is required to cover an acre, while to spray the same. 
area requires at least 100 gallons, weighing 800 pounds; on this 
account dusters can be operated on wet ground and side hills inac- 
cessible to sprayers. For spraying with nicotine sulphate, a soap 
spreader is required, and the whale-oil or fish-oil soap commonly 
used must be heated to dissolve it, which causes delay and is a dis- 
agreeable task avoided when the dust is used. 
With the dusting method, as with the spraying method, combina- 
tion treatments for insects of different kinds, mites, and certain 
fungous diseases can be given, and for this purpose nicotine dust 
can be combined with powdered lead arsenate or dry sulphur. 
WHAT IS NICOTINE DUST? 
Nicotine dust is simply a certain amount of the standard solu- 
tion of nicotine sulphate, containing 40 per cent nicotine, thoroughly 
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