F. V. TlIKoliALD '27 



Ireland. Ratlidrum, Co. Wicklow ; DiiiMlium, Co. Tipperary ; 

 Kilrusb, Co. Clair; Camolin, Co. Wo.xford. 



I liave h(MMi uiialilc to ol)taiii any records from Scotland. 



Fond plants. 



Thoro is no donl)t that the jronus Picea is tho normal food plant of 

 this aphis, l)ut I have taken it in nnmbeis on Scots firs on six occasions 

 and once on a Weyino\ith pine at Wye. 



Its normal food plant is probably Picea excelsa, and until recently 

 I have not seen it on any other species of conifer except the Scots and 

 Weymouth pine^. 



The species of Picea on which it has been recently found are the 

 following : 



Picea excelsa, P. sitchensis, P. jningens, P. engelmannii, P. nigra, 

 P. alba, P. gigantea, P. rubra, P. morinda, P. orienfalis, P. monstrosa, 

 P. omorica, P. kosteriana, P. glehire. 



Apparently immime varieties. 



Certain varieties are apparently immune, such as P. polita, P. hon- 

 doensis, P. alcoguiana and P. aJaskiami and in some places P. omorica 

 has not been attacked. 



Varied degrees of attack on different sjiccies. 



Speaking generally, the Sitka spruce is by far the most damaged, 

 but this does not apply everywhere. For instance in the small nursery 

 belonging to Wye College I was unable in 1913 to find a single specimen 

 of this insect on the Sitkas, but Picea excelsa close to them were found 

 to have any number on them and a few were badly damaged. 



At Kew P. sitchensis, P. pimgens and P. engelmannii were badly 

 damaged, even trees 20 to 30 feet high, P. nigra and P. alba were in 

 some cases damaged, others escaped. It was noticed here that the 

 European and Asiatic species- were damaged much less, the only seriously 

 injured one being P. excelsa. 



In a large nursery I visited at Woking I found it doing great damage 

 to P. pungens, P. alba and P. sitchensis and a great deal on P. excelsa. 



In my garden one large P. excelsa was entirely browned by it and I 

 think is dead, another was partly ruined, whilst P. pungens var. kosteri, 



1 I may point out licie that Dr Henry in the Gartlenerii' Chronicle says the aphis has not 

 been noticed on any genus except Picea. 



