166 " Damping off," etc., of Tomato Seedlings 



The results tabulated above indicate that superphosphate and nitrate 

 of soda have but little effect upon the disease. On the other hand a 

 dressing of 11 gms. of sulphate of potash per 5 lbs. of soil, brought about 

 a considerable reduction in the average of diseased seedlings ; this result 

 serving once more to emphasise the power of suitable dressings of potash 

 to restrict fungus diseases. 



Fungicides. 



In these tests the boxes were made up in the usual way, using in- 

 fected soil; 100 seeds per box were sown and covered; the fungicidal 

 solutions in the quantities shown in Table VI were then applied from 

 a copper sprayer. The boxes were left until the seeds germinated, when 

 the percentage germination and the percentage diseased seedlings were 

 determined. Each diseased seedling was removed as it fell over. 



The results obtained indicate that none of the solutions tested are 

 able to control the disease, without injury to the plants. 



Control of the disease by soil sterilisation. 



Sterilisation of the soil by heat or formaldehyde has proved the most 

 effective method of controlling "damping off." 



