32 On an Insect injurious to Fruit-trees. 



with the object I have in view, that of enabling any gardener 

 to recognise the moth in question. 



How long these moths live after being excluded from the 

 chrysalis, I am not able to say : but from analogy, and the 

 circumstance that some which I reared under a glass jar did 

 not survive above a week, I conclude their term of existence 

 does not much exceed that period. Hence, as I find them 

 in my garden from May to the middle of August, it is clear 

 that they are not, like many other insects, confined to one 

 term of exclusion, but are issuing from the chrysalis through- 

 out the whole summer ; in greater number, however in June 

 than afterwards. In the day time they usually remain sit- 

 ting at rest on the trunks and branches of the trees from 

 which they have emerged ; flying about, like other moths, 

 only in the night. The sexes, judging from those I reared 

 under glass, copulate soon after their exclusion from the 

 chrysalis; and as the female, as remarked by Brahm, is 

 not provided with any instrument for piercing the bark, it is 

 probable that she deposits her eggs on the outside of it, the 

 young larva? subsequently making their way into the tree. 



The only work in which I have found any allusion to the 

 economy of this insect, is a German publication, Brahms 

 Insehten Kalender. In this it is briefly observed, that the 

 larva? winter in the trunks of Apricot and Almond-trees, upon 

 the sap of which they are supposed to live, and to which it 

 is conjectured they are very injurious. 



With regard to the best mode of destroying these insects, 

 when their attacks are injurious, I have nothing better to 

 offer than a few imperfect hints. The first and most essen- 

 tial process evidently is, to cut away the edges of the cankers 



