EXPERIMENT STATION BULLETINS. 48o 



CONCISE DIRECTIONS FOR CONTROL. 



Special Bulletin No. SI. 



BY G. IT. COONS AND EZRA LEVIN. 



Tt is definitel}^ known that seedlings coiniuoiili/ carry f/i.e The disease 

 injection- to the field. The seed is not thought to carry the fo'^thTieid 

 iungous spores. Therefore, if the soil in the Hats or cohl ^^J^f^ ^ 

 iranie is dean the plants start clean.* 



To insure clean seedlings spray the young, plants at least spray young 

 tn-ice with weak Bordeaux mixture (2-2-50). p^*""*^- 



Do not follow tomatoes with tomatoes. Have a system- The dise^^se is 

 a tic rotation for your fields. Cleaning up of trash in garden overfrom^'^^ 

 patches and fields is a good sanitary measure. Do not throw f^f q^" y^^"" 

 o'd vines on the manure pile or compost lieap. diseased 



plants. 



Where the tj'pe of culture permits, staking of tomatoes The spores . 

 will largely prevent damage from tonmto leaf-spot. Staked fhe'^soi/^and 

 tomatoes give greater yields, earlier crops and allov/ most jo^i.\g|veg 

 efficient spraying. 



After the plants are well started in the field, spray every Tomato 

 10 days loith Bordeaux mixture 'r-'i-oO, made exactly accord- prolected"by^ 

 ing to directions. The early sprayings are most important B9rdeaux 

 in preventing the disease from getting a foothold. When 

 the ])lants are large, unless the application is thorough it 

 will pay to sisray down and back on the same row. This, if 

 a gentle wind is blowing and if the sprayer gives a good 

 mist, will insure a thorough application. 



Tomato leaves make a quick growth. Frequent sprayings Frequent 

 arc necessary to keep the new growth covered. to^keep'^thl'^^ 



new growth 

 covered. 



*(1) Soil from fields which have not recently grown tomatoes is safe for use. Manure 

 containing tomato trash is unsafe. 



(2) Used soil may be sterilized l>y steaming by the inverted pan method. 



(3) Used soil may be disinfected by drencbing^with formaldehyde 1 to TOO parts water. Use 

 1 gallon to the cubic foot, drenching the soil completely. A quart of solution will disinfect 

 a flat. Cover with paper or canvas over night. Then turn the soil thoroughly to allow the 

 fumes to escape. As soon as the soil is in good condition, plantings may be made. This 

 treatment is simple, cheap and easy. It will also prevent damping off. 



