TOBACCO. 215 



plant. Land badly infested should be discarded for tobacco 

 and planted to maize or another cereal for several seasons. 



Of the insect pests, those given below have proved the 

 most troublesome : — 



Tobacco Slug (Lema hilineata). — This is probably one of 

 the worst pests, particularly in seed-beds. It is readily con- 

 trolled by spraying with a solution of arsenate of lead, two 

 ounces (powder) to four gallons of water. 



Split-Worm Leaf-Miner or Stem-Borer (PhthorinKBa 

 operculella) . — It does most damage in the seed-bed. Seed- 

 lings having swellings on the stems should not be used as 

 transplants. Spraying with a solution of arsenate of lead of 

 the strength given for the Tobacco Slug is effective. 



Cutworms (Agrotis spp.) and Surface Beetles (Gono- 

 cephalum spp.). — These are destructive to the young trans- 

 plants. They are best controlled by clean cultivation and 

 winter ploughing. 



Tobacco Bud Worm (Chloridca ohsoletea) damages the 

 seed capsules. After examining the seed-heads for lai-va3 the 

 manilla bags should be left on. The seed-heads should be 

 examined periodically in order to make certain that no larvae 

 have been overlooked. 



REFERENCES: 



1 " Origin of Cultivated Plants." — De Candolle. 



2 " Commercial Products of India."^Sir Geo. Watt. 

 ^ Official Year Book of the Union of South Africa. 



* " Different Methods of Curing Tobacco." — J. du P. Oosthuizen; Journal 



of the Dept. of Agric, August. 1922. 

 5 " Tobacco Curing."— Garner: U.S.D.A. Bulletin 523. 



* " Physiological Studies of Conn. Leaf Tobacco." — Loew, U.S.D.A. 



Report 65. 

 ' " The Relation of Nicotine to the Quality of Tobacco." — Garner, 



U.S.D.A. Bulletin 141. 

 « " The Relation of the Composition of the Leaf to the Burning Qualities 



of Tobacco."— Garner, U.S.D.A. Bulletin 105. 

 « Articles on Tobacco by H. W. Taylor: Union Journal of Industries, 



July, August. October, November and December, 1921. 

 1" " The" Uses of Tobacco Waste."— Journal, Dept. of Agric, March, 1922. 

 " " Handbook of Tobacco Culture." — Rhodesian Dept. of Agriculture. 

 12 " Curing Cigar Tobacco." — Wilson. Union Dept. of Agric, Bulletin 73. 

 " " Seed Selection of Turkish Tobacco."— Koch, Union Dept. of Agric, 



Bulletin 2, 1918. 

 1'' " Turkish Tobacco Seed Beds." — Koch, Union Dept. of Agriculture, 

 L.S. No. 69. 



