Kew York Ag-ricultural Experiment Station. 65 



During the latter part of July the disease began to appear abun- 

 dantly on the unspiayt d row. By August 2d the contiast between 

 the sprayed and uusprayed rows was very striking and as time 

 passed this contrast became more marked until at the time of 

 the last spraying, September 7th, the unsprayed plants were all 

 ruined and most of them were dead, while the sprayed plants 

 were in perfect health. (See Plates IV and V.) 



RECOMMENDATIONS FOR TREATMENT. 



Cuttings should be taken from healthy plants only. Anthrac- 

 nose is often transmitted from one generation of plants to the 

 next by means of infected cuttings; hence plants grown from 

 cuttings usually suffer more from anthracnose than do plants 

 grown from seed. It is very improbable that the disease can be 

 transmitted by means of the seed. 



So far as known at present, this anthracnose attacks no other 

 plant besides the .\ntirrhinum. Therefore, the florist whose 

 grounds are free from the disease will have no trouble so long as 

 he propagates only from his own stock or from seed. In such a 

 case the source of danger is in diseased cuttings and plants from 

 other establishments. How far the disease may be carried by 

 the wind is not known, but probably less than a half mile. 



Where anthracnose is troublesome spraying with Bordeaux 

 mixture should be commenced as soon as the cuttings are rooted 

 and continued until the plants are transplanted into the green- 

 house in the fall. The spraying should be done thoroughly and 

 at intervals of from one to two weeks, according to the weather 

 and the severity of the disease. If the plants can be kept free 

 from disease until they go into the greenhouse, it may not be 

 necessary to give them further treatment. Should it seem neces- 

 sary to spray in the greenhouse, we would suggest the use of 

 ammoniacal solution of copper carbonate, as it will not spot the 

 flowers and foliage so much. Overwatering should be carefully 

 avoided and the foliage wet as little asi possible. Thorough ven- 

 tilation will also aid in keeping the disease in check. 

 5 



