818 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Roestelia cancellata produces on the j^ark of the savin tree brownish- 

 red cork-hke excrescences ; from the savin the fungus spreads to the > 

 pear, forming pustules on the leaves. 



The tendency to canker in apple and pear trees may be lessened by 

 the use of phosphate of lime. Liquid manure should be avoided. 



Scab. — Apples and pears are less liable to suffer from attacks of 

 F usicladium dendritic ii'iii and F. pirinwni if they are grown in well- 

 cultivated manured soil. The best remedy for scab is winter spraying 

 with Bordeaux mixture. F. cerasi causes cherries to fall before they 

 are ripe. i 



Monilia cinerea and M. fructigena cause black rot in cherries; they 

 also account for the decay of the branches of cherries, plums, almonds, 

 ^kiidiPrunus triloha fl,. pi. M. laxa attacks apricots, and M. Linliartiana }' 

 peaches. h 



American Gooseherry Mildew. — Eepeated spraying wuth a 4 per 

 cent, solution of potassium sulphide is recommended. American 

 Mountain gooseberry, ' Compagnon,' ' London,' resist this fungus. ! 



Gloeosporiuni ribis causes currant bushes to lose their leaves. The 

 young leaves must be sprayed w4th a 2 per cent. Bordeaux mixture at j 

 the beginning of May, and tv/ice again at intervals of a fortnight. The 

 fallen leaves must be destroyed. 



No remedy is known for the strawberry mite Tarsonemus fra- 

 gariae. 



Vines attacked by false mildew, Peronospora viticola, should be | , 

 sprayed with Bordeaux mixture. — S. E. W. 



Plant Diseases and Pests, Recent Advances in ouf Know- I 

 ledgre of. By Gunther (Gartenflora, vol. lix. pt. xvii., pp. 369-373). — 

 Finger and toe disease [Plasmodiophora hrassicae) has destroyed from ! 

 60 to 100 per cent, of the cabbage crops in some districts in Germany. 

 Diseased plants should be burned and the ground treated with quick- ; 

 lime. The use of nitrogenous manure alone is to be avoided, and an ! 

 adequate supply of phosphates and potash must be ensured. Cabbage : .. 

 black rot, caused by Pseudomonas campestris, has been introduced into \ 

 Bavaria from America. Burning the plants and liming the soil are 

 advisable. 



Cucumbers have been attacked by false mildew, Peronospora 

 cuhensis. Spraying with Bordeaux mixture is the best remedy. 

 Marsonia Panattoniana causes brown spots on lettuce. The beds 

 should be sprayed with copper sulphate solution and the young plants 

 with ^ or 1 per cent, solution of Bordeaux mixture. 



Cabbage fly {Anfhoniyia hrassicae) and asparagus ily have been 

 very destructive. Sprinkling kainit on the soil appears to check the 

 ravages of the cabbage fly. 



Savin trees act as hosts to the spores of GjiiiiuosporaiKjiinii ^ahiiiae; 

 they should not be planted near pear orchards, as the fungus causes 

 fleshy orange-coloured swellings on tlie under surface of tlie leaves of , 

 pear trees. Oak trees suffered from an epidemic of mildew, and 



