30 



Shortly following the fifth spraying, made late in July, it was noted 

 that the grass in the sprayed area showed a darker green color than 

 did the adjoining unsprayed lawn. This darker green color appeared 

 to be cumulative as the season advanced. At the time of the last 

 spraying, September 20, the sprayed area was very clearly dis- 

 tinguished by the darker green color of the grass (Plate I, fig. 1), 

 also there were but few living dandelion plants remaining in the plat. 

 The final spraying for the season killed the foliage on all the dandelion 

 plants in the sprayed area to such an extent that less than thirty 

 plants showed any green foliage when the fall season came to a close. 

 As far as the killing of the dandelion plants was concerned, the ex- 

 periment was a decided success. Experience seemed to indicate 

 that five sprayings or, possibly, fewer would have secured the same 

 results. The sprayings which could well have been omitted were 

 those made during the latter part of July and in August. 



THE EXPERIMENTS IN 1913. 



PLAT 1. 



In the spring of this year, at the active blooming period, the clear 

 sod of the sprayed area of this plat presented a marked contrast 

 to the adjoining untreated area which contained countless numbers 

 of dandelion plants in bloom (Plate I, fig. 2; also Plate II). 



The eradication of the dandelion plants in this plat was so complete 

 that it was unnecessary to spray this season. However, it was evi- 

 dent that the bare spots left by the dead dandelions would soon be 

 reoccupied by other dandelions from seeds unless something were 

 done to prevent it. Clearly, the advantage gained by spraying 

 should be followed up next spring by reseeding with grass seed to 

 cover the bare spots before dandelions could take possession of 

 them. Also, it was evident that the lawn grasses had been slightly 

 injured leaving some of the coarse weed grasses, such as crab grass, 

 more in evidence. 



During this season various tests in the form of after-treatment 

 measures were conducted, having in view the hastening of the healing 

 of the scars left by the dead weeds, and the renovation of the turf. 

 These treatments consisted of the use of fertilizers alone, seed alone, 

 and combinations of fertilizer and seed upon sections of lawn 



