15 



CONCLUSIONS. 



From out- own experiments and the reports of those who have used 

 the evaporated sulphur we can recommend its use for the destruction 

 of rose leaf blight, rose mildew, grape mildew, chrysanthemum leaf 

 blight and the red spider. It is certainly an aid also in preventing 

 mildew on the lettuce. Further experiments however begun earlier 

 in the season may give more positive results, but our main dependence 

 in the growth of lettuce under glass must be the proper conditions 

 of temperature, moisture and plant food. 



I would again advise caution in the use of sulphur, and that every 

 precaution be taken to avoid its taking fire, for the fnmes of burning 

 sulphur will quickly destroy all plant life, and even five minutes of 

 burning might destroy hundreds and perhaps thousands of dollars 

 worth of plants, 



THE PLUM WART. 



(Sphoeria morbosa.) 



The plum is easily grown and would be a profitable crop in Mas- 

 sachusetts were it not for the black wart so common on the branches 

 of the old trees, and the plum curculio (Conotrachelus nenuphar.) 



A means of overcoming the latter has been found by planting the 

 trees in poultry yards, and by recent experiments it is believed that 

 syringing the trees with paris green at the time when the curculios 

 are working will prove effectual. The black wart however has not 

 been so successfully controlled. The wart, which every plum grower 

 is familiar with, and which is also found on the old sour garden 

 cherry and the wild choke cherry, often more abundantly even than 

 upon the plum, is due to a parasitic fungous growth, the spores of 

 which germinate in moist weather on the bark, and penetrating it, 

 feed upon the soft inner tissues of the branch. The growth of the 

 fungus and that of the tree in its effort to overcome the injury, causes 

 this enlargement which is known as the black wart or the black knot 

 of the plum. 



To determine if there is not a more effectual and satisfactory 

 remedy than that of cutting off and burning the warts (which is in 

 part effectual) the following liquids were applied. 



1. Linseed Oil. 



2. Turpentine. 



3. Kerosene. 



These remedies were applied with a small brush as soon as the 



