REMEDIES FOR INSECTS AM) ITXiJI INJIUINC; FIJI ITS. 69 



Professor Maj'nard did not kuow that any black spot on the 

 rose leaves had appeared in the Durfee Plant House since the use 

 of evaporated sulphur was adopted. He believed the fungus wa& 

 entirely destroyed by that treatment. 



William C. Strong called for further information as to the 

 treatment of the Black Wart with kerosene. 



Professor Maynard said that the black wart should hv treated 

 at once upon discovering its presence, by an application- of the 

 Bordeaux mixture, and followed up by another application of the 

 same remedy every two weeks, as a new crop of the fungus spores 

 (Ploiorightia morbosa) will generalh' mature in that time, and 

 continued until no evidence of fresh spores can be found. If 

 applied in the spring, the eau celeste liquid will destroy' these 

 germs, but if they become established the knife will have to be 

 used, and the wounds thus made should be covered with a coat of 

 paste, composed of some ochre or whiting, or any other of the 

 dry, earthy pigments, mixed thoroughly with kerosene to a con- 

 sistency that can be readily spread with a brush over the exposed 

 surface without running beyond the limits of the wound. This 

 would protect the surface from atmospheric action, kill the wart, 

 and prevent the development of an}- fresh spores which might fall 

 upon it. He had visited a plum orchard in Lancaster, which was 

 literally breaking down from the development of black wart. In 

 that case nothing could be done but cut off all the tops. Should 

 a dressing of hen manure and ashes be applied to the land the trees 

 would, iu due time, produce new and health}' tops. Allusion was 

 also made to the wild choke cherry as a much neglected propagator 

 or nursery of the black wart. 



Nathaniel T. Kidder called attention to Professor Maynard's 

 remark about the wild cherry trees, which are infected with not 

 only black wart but sundry insect pests. He wished to impress 

 this fact upon the minds of all present, and would like to encour- 

 age a war of extermination against the wild cherry because of its 

 availability for the multiplication of these enemies to fruit produc- 

 tion. 



Mr. Strong asked about the extent to which cutting out the 

 black wart should be carried. 



Professor Maynard said the diseased portion should be cut out 

 clean. The rootlets (mycelium) penetrate deeply into the wood,, 

 and if not all removed the disease continues to extend ; therefore 

 a pai'tial cutting is a waste of time. 



