lxxviii PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 



into the pieces will show where they are buried. The millipedes appear, 

 however, to be so fond of ripe strawberries that I doubt if these baits 

 would tempt them away from them. Placing straw, &c, under the fruit, 

 as is so often done. I am sure encourages these pests." 



Scale 071 Ash. — Mr. Saunders reported: — " The insects infesting the 

 pieces of ash-stem are scale insects. The larger white woolly ones are 

 female specimens of Pseudococcus aceris (Signoret) ; the insect itself is 

 at one end of the ovisac, almost hidden by the wool-like matter with 

 which the eggs are surrounded. The other insects, which look like small 

 long white specks (only § mm. or l-40th of an inch in length), are the 

 males of Clnonaspis salicis, an insect which is very common on the ash, 

 various kinds of willow, and the alder. The female scales are nearly 

 twice the length of the males, and are of a more or less oval or rounded 

 form. The best means of destroying the Pseudococcus is by brushing 

 off the white ovisacs, and then spraying with a strong solution of paraffin 

 emulsion ; or in the course of the winter, after the leaves have fallen and 

 before the buds show any signs of opening in the spring, with a caustic 

 wash. The same methods will destroy the Chionaspis" 



Violets Attacked by JEcidium. — Dr. Cooke, Y.M.H., reported on these, 

 received from Bournemouth : — " The violets are attacked by violet cluster- 

 cups (Joubn. R.H.S. xxvii. (1902), p. 25, pi. i., fig. 21). Plants once 

 attacked seldom recover. It is an endophytic parasite, and cannot be 

 eradicated from a plant in which it has become established. As a pre- 

 caution, all the infested plants should be rooted up and burnt. The 

 others should be sprayed with Bordeaux mixture to preserve them from 

 infection by any spores left on the soil." 



Botanical Certificate.— A letter was received from the Council saying 

 that the resolution passed by the Committee at a recent meeting would 

 be borne in mind in making the arrangements for next year. 



Scientific Committee, July 18, 1905. 

 Dr. Iff. T. Masters, F.R.S., in the Chair, and eight members present. 



Diseased Potato-leaf. — Dr. Cooke, V.M.H., reported on the potato- 

 leaf brought by Mr. Saunders to the last meeting : — " The black blotch 

 on potato-leaves bears a superficial resemblance to that caused by 

 Macrosporiu?n solani; but in the specimens submitted to examination no 

 mycelium or conidia could be detected, the spots being entirely barren." 

 The leaves were curled and blotched with yellow and black. 



Contorted Teasels. — Dr. Masters, F.R.S., remarked further upon 

 these, that some plants, specimens of which he showed, had after 

 persistent pinching at last begun to twist, a peculiarity which Prof, 

 de Yries said was an inherited character, but which Dr. Masters, after 

 cultivating the plants (grown from seed received from Prof, de Yries) for 

 ten or more years, had not been able to observe before. 



Diseased Mulberry Leaves. — Mr. Saunders, F.L.S., showed specimens 

 of mulberry leaves from Algiers apparently attacked by some fungus, 

 which Dr. Cooke and Mr. Gussow undertook to examine. 



