376 Insect Pests. 



The larvte fall readily to the gromid if the tree is Jarred, especiallv 

 wben they are rolled up and not feeding. This enal)les us to cope 

 with this pest mechanically, by jarring them off on to tarred sacks 

 or any other convenient way in which they may be collected. 



Arsenate of lead may be used as a spray or the more conventional 

 hellebore wash. Fortunately, feeding on the under surface of the 

 leaves, they are more readily poisoned than the slugworm, as the 

 poison is not so easily washed off by rain. 



Eefeeences. 

 (1| Ciimeroii, P. 'A Monograph of Britijih Phytopli;igoiit; Hymenoptera,' 



vol. II.. p. 83 (1885). 

 (2) Theohahh F. ]'. Keport on Economic Zoology for the year ending 



April 1st, IflOfj, pp. 18-21 (19051. 



THE PLUM FRUIT SAWFLY. 



(Iloji/iird i/ijHi fiilricoriii--^. Ivlng. ) 



Tlie plum has long lieon oljserved by growers and gardeners to 

 be attacl<ed l.iy a large maggot, which we miw know to be the 

 Hoplocuiiijiii fii/riciu'it/y, (if Ivlug, the TrnfJircdn ninrio of Schmidberger 

 and Kollar (4). 



During the last ten years tlie raviiges of this sawily ha\'e certainly 

 become more marked than formerly. 



Frequent complaints have been sent me Iroui Worcestershire, 

 where in the Evesham district in I'.IOO consideraljle damage was done 

 to several varieties, including greengages. 



From Eoss ^Ir. (Setting wrote first in May lHOo, complaining 

 of the damage, and sending small plums many of wdiich showed the 

 round exit hole of the larva (Fig. 249). 



In June towards the end of the montli he I'ound nurny pierced 

 fruitlets (Ui the ground, but all the grubs had left them (1). In June 

 1(107 he wrote again complaining of a still farther attack and on more 

 trees. In 1889 a Yictoria plum at Houghton was examined, in wdiich 

 every fruitlet had been struck ; since that year the Plum Sawtly has 

 not occurred in the locality. In 1907 a prune on the South Eastern 

 Agricultural College plantati(ui was badly infested, mi trace of it 

 had been seen before anywhere near. 



(-)rmerod (2) records it from Urchester in June, the t.iliserver 

 mentioning that the plums were heavily attacked, qnite half the 

 crop being injured, also from the Toddinglon Fi'uit I'laiitations, and 

 also from the same locality in wdiich complaints wcro made to nu' (o) 



