58 



species and accompanies the pine to its limits. The other species of 

 Diprion have two generations a year in Germany. Since the planting 

 of pines was carried out in Denmark, species of Diprion have appeared, 

 apparently coming from south Sweden. In Denmark, D. pallidum 

 alone has two generations, the others only one — probably as an 

 adaptation to the northern cKmate. 



The third part of this paper deals with the Nematids of the larch 

 and fir. Of the three forest larch Nematids, Lygaeonematus wesmaeli, 

 Tischb., is the least knowTi. In June 1908 the author found consider- 

 able damage by this species in a jilantation of vigorous 6-9 foot larches 

 in Oberlausitz. Only the fresh and still very sappy, long shoots were 

 attacked, all the needles being removed. Up to this point the damage 

 resembles that done by L. abietinus, Christ {Nematus abietum, Htg.) on 

 the May growth of the fir. At the time of inspection in June, numerous 

 females were still around the larches, so that it is possible that with a 

 great increase of numbers the attack may also extend to the short 

 shoots, as in the case of L. laricis, Htg. This is, however, in sharp 

 contrast to the injury caused by L. {Holcocneme) erichsoni, Htg., which 

 oviposits on the ends of the long shoots and then migrates to the short 

 ones. L. tvesmaeli has only a single generation, while L. laricis has 

 two. The author has not succeeded in distinguishing the larvae of 

 these two species with any certainty. 



TuBEUF (Elisabeth v.). Die Weisspunktkrankheit und ihre Erreger. 



[The Whitespot Disease and its Cause.] — NaturwissenscJiaftl. 

 Zeitschr.f. Forst- u. Landwirtschaft, Stuttgart, xiv, no. 9, September 

 1916, pp. 436-446, 5 figs. [Received 1st November 1916.] 



A whitespot disease occurring on a number of plants was found in 

 1916 to be due to infestation by Jassid larvae, which were associated 

 with Aphids. These have been determined by Dr. Melichar as those 

 of Typhlocyha rosae, T. ulmi, Chlorita flavescens, Eupteryx loewi and 

 E. concinna. 



ScHAFFNiT & LiJSTNER. (1) Bericht uber das Auftreten von Feinden 

 und Krankheiten der Kulturpflanzen in der Rheinprovinz ira Jahre 

 1913. (2) Berichte iiber Pflanzenschutz der Pflanzenschutzstellen 

 an der Kgl. Landw. Akademie von Bonn-Poppelsdorf und an der 

 Kgl. Lehranstalt ftir Obst- u. Gartenbau Geisenheim. [ (1) Report 

 on the Occurrence of Enemies and Diseases of cultivated Plants 

 in the Rhine Province in 1913, (2) Reports on Plant Protection 

 of the Plant Protection Stations at the Royal Agricultural 

 Academy at Bonn-Poppelsdorf and at the Royal School for Fruit 

 and Clarden Cultivation at Geisenheim.] — Zeitschr. f. Pflanzen- 

 hranMieiten, Stuttgart, xxvi, no. 3-4, 1st June 1916, pp. 194-196. 

 [Received 1st November 1916.] 



This paper is an abstract from the three original reports. 



Many methods of control were tried against the vine moths, Clysia- 

 ■ambigueUa and Polychrosis botrana . The latter is becoming increasinglv 

 dangerous in the middle Rhine vine-growing areas, particularly in the 

 valley of the Rhine. Nicotine solutions and powders usuallv give the 

 best results against it. To control Otiorrhynchus sulcatus, the ground 

 around the vines was dug up to a depth of about 6 inches, stones were 



