96 Insect Pests. 



hand-picking we can do nothing to check the increase of this pest, 

 so noticeable during the past few years. 



Some varieties seem more liable to it than others. Mr. Smith of 

 Linton found that "Worcester Pearmains were attacked, but not the 

 alternate rows of Lord Derby (4). 



Eefeeexces. 



(1) Theobald, F. V. First Report on Economic Zoology (Brit. Mus. ISr.H.), 



p. 68 (1903). 



(2) Theobald, F. V. Second Report on Economic Zoology (Brit. ilus. X.H.), 



pp. 35 and 108 (1904). 



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



April 1st, 1905, p. 14 (1905). 



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



April 1st, 1907, p. 26 (1907). 



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



Fruits,' p. 275 (1898). 



(6) Carpenter, G. H. Injm-ious Insects and Other Animals observed in Ireland 



in 1905. Ec. Pro. Royal Dublin Soc, vol. I., pt. 8, p. 333 (1906). 



THE APPLE LEAF MINER. 



{Lyonetia clerckella. Linn.) 



This Apple Leaf Miner was unusually prevalent in 1903 and, in 

 a few cases reported, damaged the foliage of dwarf apple trees very 

 considerably. In one instance the attack was personally investigated 

 in Huntingdonshire and every leaf on two trees was found to be 

 tenanted by the larvae of this minute Tineid. 



The leaves which were attacked had more or less shrivelled, and 

 many had died away in August, the trees thus receiving a serious 

 check, as the sap was still flowing freely. This insect also appeared 

 in plenty in my own garden at Wye, which enabled me to keep it 

 more or less under observation. 



The presence of this leaf miner is easily told by the long, sinuous 

 tunnels caused by the larvte burrowing in the leaves. As a rule, a 

 single tunnel occurs only on each leaf, but where the damage has 

 been noticed, as many as four have been present, the greater part 

 of the chlorophyll being thus destroyed. 



This moth occurs in most parts of England ; it has been especially 

 recorded from Cambridgeshire, Huntingdonshire, iliddlesex, Sun-ey, 

 Kent, and from Bristol, Darlington, Manchester, and various parts 

 of Yorkshire. 



I do not know of any previous record of its doing any appreciable 



