TOMATO LEAF-MOLD 23 



The use of spraying or dusting materials under greenliouse conditions is 

 not practical or effective because of (1) The objectionable flavor imparted to 

 fruit, (2) Objectionable residue on fruit, (3) Toxicity to the foliage, (4) 

 Difficulty of covering surfaces which become infected, (5) Lack of conditions 

 necessary to obtain toxicity, and (6) The need of frequent treatments to 

 maintain protection and disinfection. 



The expense of firing for the purpose of vaporizing sulfur on the steam 

 pipes on the fall tomato crop is prohibitive. During the heating season the 

 vaporization of sulfur on the pipes may be practiced, but the value of this 

 method for controlling leaf-mold is doubtful. In the absence of pipe heat 

 conditions prevail which favor epidemics of leaf-mold. Electrical equip- 

 ment for vaporizing sulfur on a commercial scale provides a very economical, 

 practical and effective method of controlling tomato leaf-mold in the green- 

 house. The practice offers possibilities of dealing effectively with foliage 

 diseases of greenhouse plants, and is considered a great improvement over 

 existing methods of dusting and spraying. 



LITERATURE CITED 



L Anonymous. De Bladvlekkenziekte der Tomaten. Floralia 48:363-364, 

 1927. 



2. Baehr, . Die Tomatenfleckenkrankheit, Cladosporium fulvum. Mol- 



lers Deut. Gart. Ztg. 38:204, 1923. 



3. Bailey, L. H. The forcing of English cucumbers. N. Y. (Cornell) Agr. 



Expt. Sta. Bui. 31:123-139, 1891. 



4. Barker, B. T. P., Gimingham, C. T. and Wiltshire, S. P. Sulfur as a 



fungicide. Univ. Bristol, Agr. and Hort. Research Sta. Ann. Rpt. 

 (1919):57-75, 1920. 



5. , and Wallace, T. A new method of sulfur fumigation. Univ. 



Bristol, Agr. and Hort. Research Sta. Ann. Rpt. (1921) :122-124, 1922. 



6. Bewley, W. F. Diseases of glasshouse plants. 208 p. London, 1923. 



7. D., A. M. Flojisplet. Gartner-Tidende 43:41-45, 1927. 



8. Dyke, W. The A. B. C. of tomato culture under glass. 165 p. London, 



1925. 



9. Edgerton, G. W. Delayed ripening of tomatoes caused by spraying with 



Bordeaux mixture. Phytopathology 8:69, 1918. (Abstract.) 



10. and Moreland, C. C. Diseases of tomatoes in Louisiana. La. 



Agr. Expt. Sta. Bui. 142, 23 p., 1913. 



11. Hartzell, A. Naphthalene fumigation of greenhouses. Jour. Econ. Ent. 



19:13-19, 1926. Reprinted as Boyce Thompson Inst, for Plant Research 

 Prof. Paper 3:13-19, 1926. 



12. Hasper, E. Biologic und Bekampfung des Cladosporium fulvum Cke. 



auf Solanum lycopersicum. Ztschr. Pflanzenkrank. 35:112-118, 1925. 



13. Hofferichter, K. Eine verheerende Tomatenkrankheit. Gartenflora 73: 



60-61, 1924. 



14. Hostermann, G. Eine bedenklicke Art der Verwendung von Schwefel 



als Pflanzenschutzmittel. Gartenwelt 28:183-184, 1924. 



15. Humphrey, J. E. The powdery mildew of the cucumber,— Erysiphe 



dehor acearum DC. Mass. State Agr. Expt. Sta. Ann. Rpt. (1891) 

 9:222-226, 1892. 



16. Treatment for powdery mildews. Mass. State. Agr. Expt. 



Sta. Ann. Rpt. (1892) 10:243-245, 1893. 



