TORTRIX RESINKLLA. 



339 



Other species of pine, such as the Wpymouth pine and Pimis 

 ponderosa, Dough, are hahle to attack. The insect is less 

 common than the preceding. 



r. l!r))if(lit/l Measures. 



The injured buds, which can 



be recognised by their small 



size and dark colour, should be 



cut off towards the end of April. 



5. Tortrix {lietinia) resineUa, L. 

 a. Descripiion. 



Moth with a wing-expanse of 

 16 to 18 mm. ; fore-wings slaty- 

 grey with numerous shining 

 leaden - grey transverse lines 

 forked on the fore-margin ; 

 hind - wings grey - brown ; the 

 fringes pale. Body slaty-grey. 



Caterpillar 11 mm. or more 

 in length, with 16 legs, orange- 

 brown, with brownish-red head 

 and thoracic shiehl. 



/'. Lifr-liisloiij. 

 The eggs are laid in May and 

 June, just under the whorl of 

 buds of the recently - grown 

 shoots of young pines, usually 

 on the lateral shoots. The 

 caterpillar bores into the pith 

 and thus causes the growth of 



a hollow gall-like resinous mass, as large as a pea, in which it 

 passes the winter. In the spring it continues feeding, causing 

 the gall to increase 'to the size of a cherry or of a small 

 walnut, and form a swelling on the underside of the shoot 

 which encircles two-thirds of it. On section the gall is seen 

 to be divided into two compartments by a strong vertical 

 partition. In the larger one the larva lives and pupates (in 



z2 



Fig. 174.— Resin-gall of T. resi- 

 nc/la, L., on a pine shoot. 

 (^Xutinal size.') 



