354 



Kemner (N. a.). Nagra nya eller mindre kanda skadedjur pa 

 frukktrad, jamte en biologisk oversikt av frukttradens gren- och 

 stamskador. [Some new or little known enemies of fruit trees, 

 with a summary of the life-history of those which attack the 

 trunk and the branches.] — Meddelande no. 133, CentralanstaUen 

 for Fdrsoksvdsendet pa J ordhruksomradet, Stockholm, Entomol. 

 Avdln, no. 25, 1916, 21 pages, 11 text-figs. 



Scolytus rugulosus, Ratz., has been found in mountain ash in the 

 vicinity of Experimentalfaltet, having been previously recorded only 

 from the south of Sweden, Scania and Oland. Subsequently branches 

 of apple injured by this beetle were sent from the neighbourhood of 

 Nykoping and it is therefore concluded that this insect is now extending 

 its distribution northwards. The beetle and the larva are described 

 in detail and figured. It chiefly attacks fruit-trees, such as apple, 

 pear, plum and cherry, as well as peaches and apricots in the U.S.A. 

 Other host-plants are bird-cherry, black-thorn, Amelanchier, Cydonia, 

 Crataegus, mountain-ash, etc. This beetle oviposits in the smaller 

 branches avoiding the trunk and larger branches, in contradistinction 

 to the closely related Scolytus jpruni, which specially attacks the latter 

 parts of the tree. The number of generations during a year is not 

 known, but the author is of opinion that there is only one. The damage, 

 natural enemies and measures of control are discussed, but no original 

 observations are given. 



Magdalis 'pruni, L. (ruficornis, L.) occurs in company with 

 S. rugulosus, but is rare, although found throughout the country. It 

 attacks the common fruit trees, as well as apricots and peaches, and in 

 exceptional cases bird-cherry, black-thorn and roses. The attack 

 begins in the spring, when the beetles damage the leaves. The eggs 

 are deposited in crevices on the branches and the young larvae make 

 galleries between the bark and the wood, ending in pupal chambers 

 deeper than the galleries. Anobium rufipes, F., was found in the 

 decayed part of the trunk of an old cherry-tree at Experimentalfaltet, 

 which was completely perforated by the galleries of the larvae, a 

 detailed description of which is given. The imagines swarm in July 

 onwards in warm weather, oviposition taking place on the bark. 

 The larval galleries are very irregular and are completely filled by a mass 

 of densely packed excrement. The beetle attacks chestnut, hazel, 

 beach, walnut, and alder, as well as fruit-trees. It is attacked by a 

 Braconid, Hecaholus sulcatus, Curt. To control it the attacked part 

 of the trunk must be cut out and the surface covered with tar. A useful 

 key to the insects attacking the branches and trunk of fruit trees, 

 according to the nature of the injury, is appended to this paper. 



Kemner (N. A.). Otiorrlnjnchus sulcatus, F., ett skadedjur bland annat 

 pa krukvaxter. [Otiorrhynchus sulcatus, F., an enemy of pot 

 plants.] — Trddgarden, Stockholm, no. 18, 10th May 1916, p. 145, 

 2 figs. 



The larva of this weevil is often introduced into pots with soil 

 from infected hot-houses, and instances are known when as many as 

 20 larvae have been found in one pot. In the open the adults appear 

 in the spring but in hot-houses they also occur at other times of the 



