Insects, etc., Injurious to the Plum. 



385 



on Pershores, greengages and damsons. Buckton says it infests 

 many kinds of plums, both wild and cultivated, being common on 

 Primus spinosus and P. insititia. 



TREATMENT. 



This consists of spraying .with some wash having soft soap as a 

 base. Frequent use and experiments have shown that it is most 

 difficult to kill with ordinary paraffin emulsion, and almost impossible 

 with quassia and soft 

 soap. It has recently 

 been clearly demon- 

 strated by Mr. Getting 

 that it can easily be 

 destroyed by adding 

 to the paraffin emul- 

 sion liver of sulphur 

 at the rate of 1 Ib. 

 to the 100 gallons of 

 wash. 



Experiments with 

 a patent wash con- 

 taining this ingredient 

 were also completely 

 succsssful. Owing to 

 the leaves remaining 

 flat they are easily hit by a wash. Mr. Getting, however, tells me 

 he believes now and then they curl the leaves or else go to leaves 

 curled by ApliiB prutii. 



[F. Edenden. 



FIG. 257. MEALY PLUM APHIS (Hyalopterus pruni). 



Winged viviparous female, found in November, showing living 



young within. 



NATUKAL ENEMIES. 



This aphis is freely attacked by Chalcid parasites, the pearly dried 

 skins of the parasitised specimens being very noticeable. But in 

 spite of this the aphis often swarms. 



REFERENCES. 



(1) BucMon, G.B. 'A Monograph of British Aphides,' vol. II., p. 110 (1879). 



(2) Theobald, F. V. Report on Economic Zoology for the year ending 



April 1st, 1907, p. 75 (1907). 



(3) Theobald, F. V. Report on Economic Zoology for the year ending 



April 1st, 1906, p. 54 (1906). 



(4) Carpenter, G. H. ' Injurious Insects and Other Animals observed in Ireland 



during 1901,' p. 154 (1902). 



2 C 



