197 



GoDET (C). Rapport sur I'Activit^ de la Station d'Essais viticoles a 

 Auvernier. Exercice 1918-1919. — Ann. Agric. Suisse, Lucerne. 

 xxi, no. 2, 1920, pp. 25-112, 6 figs., 4 graphs. 



The chief vine pest of Neuchatel, Clysia amhiguclla, was rather less 

 destructive than in preceding years. It is noticeable that in vineyards 

 where two apphcations of Bordeaux mixture and nicotine were given 

 against the eggs, the number of larvae was appreciably smaller. 

 Numerous experiments were made with light-traps against the moths, 

 and have led to the conclusion that these have not only not been 

 efficacious, but are a considerable expense. While in some localities they 

 gave apparently favourable results, it is impossible to say whether the 

 success was due to them or to natural conditions. Light-traps placed 

 at 20 yards distance from each other captured more moths than those 

 at 30 yards intervals. For the first generation the height of the traps 

 from the ground seemed to be immaterial ; for the second generation 

 a height of 24 inches from th'e ground was the most successful, especially 

 for the traps placed 30 yards apart. The time and duration of flight 

 of the moths apparently depend entirely upon temperature ; it seems 

 probable that an average day temperature of 59° F. is necessary for 

 the emergence of moths, bvit meteorological conditions do not appear 

 to be the only factors in the great variations observed during their 

 principal flight. 



Leefmans (S.). Het Cheveluremotje [Miisotima snffusalis, Hamps.). 

 [The Maidenhair Moth, M. snffusalis.] — Teysmannia, Batavia, 

 xxxi, no. 9, 1920, pp. 428-431, 1 plate. 



The caterpillars of Miisotima suffusalis, Hamps., infesting maidenhair 

 ( Adiantum), are not easy to detect, as they are only ^/^ in. long, green 

 to the naked eye, and usually located on the underside of the leaves. 



In breeding experiments larval stages of 14 and 19 days were 

 obtained. Before pupating the caterpillar binds the leaves with webs, the 

 cocoon hanging within them. The pupal stage lasted 7 days in most 

 cases observed. The eggs are laid on the underside of the leaves, 

 the egg stage lasting five to six days and the total life-cycle requiring 

 25-31 days. Under favourable conditions 12 or more generations 

 a year may occur in the Dutch East Indies. 



Infestation in general is more marked during the wet season, but 

 in the dry season the infestation of maidenhair growing in verandas 

 is greater. Thisis probably due to unfavourable conditions in the open 

 causing the well- watered house-plants to become increasingly attractive. 



d'Angkemond (A.). Onderzoekingen over het Dooden van Lasioderma 

 serricorne, Fabr., in Tabak, door Middel van I'' Verhitting, 2° 

 Benzine. [Investigations on the Destruction of L. serricorne in 

 Tobacco by means of Heat or Benzine.] — Meded. Proefsi. Vorsten- 

 landsche Tabak, Klaien xxxvi, 1919, 28 pp. (With a Summary 

 in English). [Received 18th February 1921.] 



When a shortage of carbon bisulphide in the Dutch East Indies 

 was threatened in 1918 owing to shipping difficulties, attempts were 

 made to destro}' Lasioderma serricorne, F., in stored tobacco, by 

 exposure to heat and by fumigation with benzine. Both these methods 

 gave good results. 



