752 



Insect, Fungus, and other Pests. 



[jan. 



taining a little bisulphide of carbon may be placed here and 

 there. The room should then be made as nearly air-tight as 

 possible, and be kept closed for 24 to 48 hours, after which 

 it should be ventilated for an hour or two before being 

 used. 



Black Currant Bud Mite. — A case of big bud on currants, 

 caused by the bud mite Eriophyes ribis, was received early in 

 November. The variety was " Black Naples," budded on 

 "Boskoop Giant," and as that operation took place last July 

 it is evident that the mite has appeared in a shoot which has 

 grown since that time. This raises a point of considerable 

 interest. It is possible that the mites entered the buds on the 

 new shoots (1) from the " Boskoop Giant," as the migration 

 period, although probably at its height about June, is really 

 extended over a wide period, or (2) from the bud of the " Black 

 Naples." In any case it is an example of one of the great 

 difficulties in connection with the reappearance of the currant 

 bud mite, which is that, although black currants may be cut 

 right back, yet the mite may still appear in numbers. It is 

 possible that there are temporary shelter places other than 

 the buds. (See Leaflet No. 1.) 



Chrysanthemum Rust. — Chrysanthemum leaves received 

 from Limpsfield (Surrey) were found to be affected with the 

 chrysanthemum rust Puccinia chrysanthemi, Roze., in con- 

 siderable quantity. Diseased plants should be removed from 

 the neighbourhood of healthy ones, and both diseased and 

 healthy plants should be sprayed at intervals of five days with 

 a solution of liver of sulphur in water — 1 oz. to 3 gallons 

 of water. 



Diseased Apple Leaves. — Specimens of apple leaves were 

 forwarded from Crewkerne, and were found to be attacked by 

 the minute fungus, Phyllosticta mali, Prill, and Del. Recent 

 experiments have shown that trees which were sprayed with 

 Bordeaux mixture for the prevention of the "apple scab" 

 remained perfectly free from the Phyllosticta spot. 



Various Fungus Diseases. — Among other specimens 

 affected with fungus diseases were tomato plants from Camp- 

 den (Glos.), attacked by Septoria lycOpersici (see Journal, 

 May, 1908, p. 111). No method of destroying the resting- 



