36 



FAEMERS BULLETIN 804. 



Fig. 28. — A colony of the black peach 

 aphis on peach twig heavily infested 

 by a species of parasitic four-winged 

 lly. Enlarged. (Original.) 



tent to which it may be dihited makes 

 the spray compare favorably in cost 

 with other contact sprays. Nicotine 

 is extracted from refuse tobacco, 

 principally stems, by different com- 

 mercial concerns, and is put on the 

 market in several grades and 

 strengths. The 40 per cent nicotine 

 sulphate is the solution principally 

 used, although weaker grades of 

 nicotine may be employed provided 

 care is taken that the spray be made 

 so as to contain not less than 0.05 or 

 O.OG per cent of actual nicotine. 



Xicotine may be added either to 

 the winter - strength lime - sulphur 

 solution for the San Jose scale or to 

 the dilute lime-sulphur solution and 

 arsenate of lead spray emplo3'ed in' 

 the control of insects and diseases of 

 fruit and foliage. It may also be used 

 in Bordeaux mixture and arsenate of. 

 lead spray without interfering with 

 its effectiveness or in an arsenate of 

 lead, milk of lime, and water spray. 

 In orchard spraying the 40 per cent . 

 nicotine sulphate is used at the rate 

 of about three-fourths of a pint to 

 100 gallons of water, lime-sulphui- so- 

 lution, or Bordeaux mixture. When 

 used in water the addition of soap at 

 the rate of 4 or 5 pounds to 100 gal- 

 lons adds much to its spreading 

 power and efficiency. Soap should 

 not be used with lime-sulphur solu- 

 tion, but may be used in Bordeaux 

 mixture. "VVliere only a small quan- 

 tity of spray is required the nicotine 

 sulphate may be used at the rate of 1 

 tcaspoonful to a gallon, or 1 ounce to 

 S gnllous of soapy Avater. 



HOMEMADE NICOTINE SPRAYS. 



Where tobacco stems or refuse to- 

 bacco are available it is practicable 



