330 Insect Pests. 



HEMIPTERA— ro»f/»7ft'f7. 



x\ppLE Aphis (AjjJiis immi. De Geer). Foliage, p. 130. 



Pear Aphides {Ajjhis jj^ri, Fons., and Aphis jyyraria, Passerini). 



Foliage, p. 352. 

 Mussel Scale {Lepidosajihes ulrni. Linn.). Bark, p. 165. 

 Pear Psyll^. {Psylla simulans, Forst, and P. pyricola, Forst).* 



THYSANOPTERA. 



The Pear Thkips [Thrijjs pliysoims, Linn., and T. fiava, Schr.). 

 Blossoms and foliage, p. 352. 



ACARINA. 



Pear Leaf Blister Mite {Erioj^hyes JW^- Nalepa). Foliage and 

 Fruit, p. 353. 



THE PEAR LEAF BLISTER MOTH. 



(Ccmiosiorna scitclla. Zeller.) 



Although not of very serious nature this small niicrolepidopteron 

 requires notice, for now and again, in widely separate localities, it 

 causes harm to the pear and apple. The first instance of damage 

 done by it was brought to my notice in 1898 from two widely separate 

 localities, namely, in East Lothian, N.B., and in Cambridgeshire. 



In the former county this pretty little moth appears to have been 

 destructive for several years previously. 



The Eev. John Hart of Aberlady sent me specimens, as well as 

 his notes on the damage done. ]Mr. Cliarles Barrett kindly corro- 

 borated the identification. 



The same insect, Mr. Hart wrote me, was doing much harm to 

 pear and apple trees in the Duke of Buccleuch's gardens at Dalkeith, 

 and also at Lord Wemyss's in the same district. In the same year I 

 was called to see many trees in and near Cambridge attacked by this 

 insect, and nearly every leaf on some of the trees was found to be 

 ruined by the larvjo. 



In 1903 specimens of damage were sent me from Great Stanghton, 

 in Huntingdonshire, and the trees were later examined and the leaves 

 found covered with the mines ; apples were mainly attacked. One of 

 the worst attacks I have seen was at Eardiston, in Worcestershire, 

 where Mr. Ballard had a large pear tree with the foliage completely 

 covered with the blisters and quite blackened when I saw it in 

 August 1906. In the previous year it occurred in large numbers in 



* Vide ' Hemiptera-Homoptera of the British Isles.' James Edwards, 

 pp. 239-241. Psyllas are rare on cultivated pears. 



