Reports to various Correspondents. 37 
twigs and stems, and when so situated are extremely difficult to 
see. 
This pest seems to affect only young stock, but I have observed 
it on trees twelve years old. 
That hand-picking the attacked shoots does much good is evident. 
Mr. William Bear writes on May 29th that “ There is not so much 
damage from pith moth as there was last year, probably because I 
cut off and burnt every infested shoot that I saw, and I am doing so 
again this season.” 
The Apple Leaf Miner. 
(. Lyonetia clerckella , L.). 
An ordinarily harmless insect feeding on any of our fruit trees or 
other crops is always liable under certain conditions to increase 
abnormally and so become destructive. This has been the case with 
the small blister moth of the apple and pear, Cemiostoma scitella, 
Zeller, a beautiful little Tineicl which did a great deal of harm in 
1898 in East Lothian and Cambridge A In writing upon the life- 
history of that pest I mentioned that “ another genus, Lyonetia, has 
one species — L. clerckella — whose larvae form long sinuous tunnels in 
apple and cherry trees, but do not appear ever to be abundant 
enough to do any harm, although I have had enquiries concerning 
the economy of this species.” This Apple Leaf Miner has during 
the past season been unusually prevalent, and, in a few cases reported 
has damaged the foliage of dwarf apple trees very considerably. In 
one instance the attack was personally investigated in Huntingdon- 
shire 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, 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 larvae 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 lias been especially 
* Jour. 8. E. Agric. College, No. 8, p. 21, 1808. 
