64 



Tragardh (I.). Nagra anteckningar om barrlossens forekomst pa 

 vara odlade barrtrad. ^Some Notes on the Occurrence of Chermes, 

 on our Cultivated Coniiers.l—Lustgdrden, Arsskrift for Foreningen 

 for Dendrologi och Parkvdrd, i., 1920, pp. 108-118, 6 figs. 



This paper contains a popular account of the biology of Chermes, 

 and gives a preliminary list of the species hitherto found in Sweden 

 and of the trees on which they were found. 



Galls of C. abietis have been found on Picea alba, P. engdmanni, 

 and P. sitchensis, though comparatively seldom on the latter. On 

 P. orientalis, in Scania, a gall was found, possibly produced by 

 C. (Pineus) pint. Of species not producing galls, C. piceae and 

 C. nusslini are the most important, the former occurring on the trunk 

 and the branches of Abies pectinata, while the latter attacks only the 

 shoots and needles of both young and older trees. C. piceae has been 

 found by the author in Scania, and has also been recorded from 

 Abies nordmanniana at Alnarp. Abies sibirica was attacked in a 

 nursery at Stockholm by a species that probably is C. pecfinatae, 

 Choi. On Abies sibirica, A. nobilis, A. balsamea, A. nordmanniana 

 and A. pectinata, the shoots often become deformed b}'' the attack 

 of these Aphids, the buds disappearing through the excessive growth 

 of the bark-tissue of the shoots. C. {Pineits) pint is recorded on 

 Piniis silvestris, and C. {Pineus) strobi on Pinns sirobus. On Abies 

 subalpina, A. arizonica and A. cilicica other species of Chermes have 

 been found, but have not yet been identified. 



Tragardh (L). Tallbastborren och granbastborren, tva fiender till 

 skogskulturer. [Hylastes ater and H. cunicularins, two Pests 

 of Forest Plantations.] — Staiens Skogsforsoksansialt, Stockholm, 

 Flygblad no. 19, 1920, 6 pp., 5 figs. 



A popular account is given of these two beetles, based on investi- 

 gations conducted by the author in Sweden during recent years. 

 The scarcity of data relating to injuries caused by them is undoubtedly 

 due to the fact that such injuries are commonly confused with those due 

 to Hylobius abietis. Injury by Hylastes is, however, chiefly to be 

 found' on the roots and at the base of the stems, and the mines are 

 more or less gallery-shaped, with the edges overhanging the galleries, 

 whereas those made by Hylobiits are more or less rounded and narrowest 

 at the bottom, with gradually sloping sides, and occur higher up on the 

 trees. Hylastes ater seems to swarm a little earlier than H. citnicularius, 

 both species appearing after Myelophilus and Hylastes [Hyliirgops) 

 palliatus, but earlier than Ips typographns. 



Control measures are essentially the same as against Hylobius. 

 Plantations should not be started in the vicinity of recent cuttings 

 during the two following years. Injured trees must be removed and 

 burned, care being taken to remove gently at the same time the earth 

 surrounding the roots, many beetles being found there, which would 

 otherwise escape. 



Tragardh (I.). Bokskoldlusen. [Cryptococcus fagi, Baer.] — Statens 

 Skogsforsoksanstalt, Stockholm Flygblad no. 21, 1921, 4 pp., 1 fig. 



Cryptococcus fagi occurs in Southern Sweden, but is comparatively 

 rare ; in some localities only have severely attacked beeches been 

 found, the trunks up to 10-13 feet above the ground being covered 



