TOMATO LEAF MOLD f 



Table S.^Relation of Leaf-Mold Control to Yield and Value of 

 Tomatoes 



Spring Cropping Season 1928. 



With Poor With Good 



Management Management 



Average \icld per plant : 



Firsts pounds 5.17 7.99 



Seconds pounds 2.55 2.56 



Total pounds 7.72 10,55 



Average value per plant: 



Firsts $1.53 $2.36 



Seconds .30 .32 



Total 1.87 2 . 68 



On j4-acie basis: 



Total yield pounds 15,980.4 21,838.5 



Total value $3,870.90 $5,547.60 



In the spring growing season (1928), 45 percent of the leaflets were infected with 

 leaf mold under poor management and only 2 percent under good management 

 (Table 4). This control meant a significant average increase per plant of 2.83 

 pounds and 81 cents, or 5,858 pounds and $1,677 on a quarter-acre basis (Table 5). 



In the fall season (1928) 85.6 percent of the leaflets showed leaf mold under 

 poor management and 14.5 percent under good management (Table 6); but the 

 diff^erence in yield was only .79 pounds and 20 cents per plant, or 1,635 pounds 

 and $414 on a quarter-acre basis (Table 7). The small difference in yield with a 

 significant contrast in disease conditions showed that there were other factors 

 limiting yield. It is also apparent that considerable foliage loss from the disease 

 is necessary before there is any loss in yield. While the value from good man- 

 agement practices alone was not always striking, nevertheless in general the 

 results show justification for the effort. 



Table 6. — Control of Tomato Leaf Mold by Greenhouse Management 

 Fall Cropping Season 1928. 



Date of 



Percentage of Diseased Leaflets 



Foliage Counts With Poor With Good 



Management Management 



September 11, 1928 0.0 0.0 



September 25, 1928 4.1 8.1 



October 26, 1928 90.6 36.8 



November 22, 1928 100.0 22.5 



December 22, 1928 100.0 10.5 



January 10, 1929 100.0 8.1 



January 30, 1929 100.0 13.3 



Total 85.6 14.5 



