Insects, etc., Injurious to the Plum. 379 



all the winter and pnpate in February. A single brood only occurs. 

 The sawflies, like those which attack the apple, are only seen on the 

 win^r in bright still weather. 



PREVENTION AND TREATMENT. 



There seems to be no way of preventing the insects from laying 

 their eggs. It is advisable when a single tree is affected in a garden 

 or plantation to have the whole of the fruitlets picked and burned, 

 so as to stamp the insect out ; if this is not done it may spread to 

 the surrounding trees another year. All infested fruitlets should 

 be picked up and destroyed at once. Land beneath trees which 

 have been attacked might be dug over, well prong-hoed and heavily 

 dressed with gas lime in winter. No trials have been made, but it 

 is quite possible that a long sticking arsenical wash, such as Swift's 

 Arsenate of Lead Paste, sprayed over the young fruit would poison 

 many of the larvse as they bore into fresh fruitlets ; it is certainly 

 worth a trial where this insect is very harmful. 



References. 



(1) Theobald, F. V. Eeport on Economic Zoology for the year ending 



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



(2) Ormerod, E. A. ' Handbook of Insects Injurious to Orchard and Bush 



Fruits,' p. 182 (1898). 



(3) Theobald, F. V. Eeport on the Orchards and Fruit Plantations of 



Worcestershire, p. 14 (1906). 



(4) Kollar, V. ' A Treatise on Insects ' (Eng. Trans.), p. 268 (1837). 



(5) Taschenberg, E. L. ' Praktische Insekten-kunde,' II., p. 324 (1879). 



THE LEAF-CURLING PLUM APHIS. 



(Aphis pruni. Pieaumur.) 



The Plum Aphis (A2)his pruni, Pteaumur) is one of the most 

 destructive plum pests, and has been unusually severe in its attack 

 in recent years. Complaints have come to hand from all parts of the 

 country regarding the harm done by this aphis. Its attack is very 

 characteristic, the edges of the leaves gradually rolling around and 

 forming nests for the rapidly increasing insects ; in bad attacks the 

 curled leaves die, and then the fruitlets soon commence to fall. 

 Sometimes the young leaves that are attacked fall prematurely when 

 still green, but, as a rule, they hang on until dead and the tree 

 presents a strikingly characteristic appearance. 



