Reports to the Boai'd of Agriculture. Tj 



were shrivelled and killed, as also were the two Psylla eggs ; some of 

 the former, however, had liatched out. Psylla mali has been most 

 destructive during the past season, both in Worcestershire and 

 Herefordshire, and has been more or less troublesome in Kent. 



For these two pests a combined wash of paraffin emulsion and 

 sulphur should be used. Ordinary paraffin emulsion may be made 

 by mixing e(iual portions of boiling soft soap solution and paraffin 

 together, and then churning them up by means of a force pump until 

 a creamy emulsion is produced. When required for use, this may be 

 mixed with twenty-five times its bulk of warm water. 



To every three gallons of this dilute emulsion, add one ounce of 

 liver of sulphur and well mix. Spray in a fine spray, so that every 

 part of the tree is wetted. 



(ii) The only thing to do after the buds have burst to destroy 

 mussel scale is to wash with paraffin emulsion two or three times 

 during the late spring and early summer. Commence at end of 

 April — if possible a look out should be kept — and as soon as any 

 signs of the yoimg active scale insects are noticed crawling about 

 the trees washing should be carried out ; the corroding effect of 

 paraffin emulsion is not great on the mature scales, but it soon 

 destroys the immature forms. 



The wash recommended for the two former insects will do also 

 for this scale. 



Aphides {A. mali, Fabr.) on Apple Trees. 



Some insects sent by a correspondent of the Board from Chesham 

 proved to be the Apple Aphis {Aphis mali), which has been doing an 

 enormous amount of damage this season (1902) in the South of 

 England — many orchards being covered by them. Steps should be 

 taken as soon as the plant lice are seen to destroy them. This can 

 easily be done if the leaves are not too far curled up, but even then 

 some good can be done by spraying. 



The best wash to advise for this Aphis is soft soap and quassia, but 

 if the operator has proper sprayers, paraffin emulsion. It should be 

 pointed out that the wash must go on the under surface of the leaves. 

 Two washings, at a few days' interval, are usually necessary for this 

 pest. 



This pest was also reported as doing considerable damage at 

 Tunbridge Wells, and also from Glazebrook, near Manchester. 



