467 



The first-named never did direct injury to health\- beets. The best 

 remedy is dusting the fields with hme after heav}' rain. In dry weather 

 the ground should be ploughed up on sunny days to let it dr}'. 

 Heterodera schachtii tends to disappear as the planting of beet after 

 beet is now less practised If the dry weather lasts beyond May a 

 mass infestation by the black aphis [Aphis rumicis] is to be expected, 

 and supphes of nicotine should be kept ready. In 1921 Atomaria 

 linearis and milhpedes were common. 



Un Ennemi de la Betterave : La Casside n^buleuse. — La Terre Vaudoise, 

 Lausanne, xiv, no. 25, 24th June 1922, pp. 317-318, 1 fig. 



Beet in Switzerland is attacked by Cassida nebiilosa, a well-known 

 Chrysomelid pest of this crop. After hibernation the beetles mate in 

 spring, and eggs are laid on the upper surface of beet leaves. Though 

 the adults eat the leaf-tissue, it is the larvae that do most of the harm. 

 There are usually two generations a year. As Chenopodiinn album is 

 a favourite food-plant, this weed should be cleared from the infested 

 beet-fields. Early sowing produces vigorous plants before the infesta- 

 tion begins. The destruction of the adults is important ; traps for 

 them may be baited with decomposing meat. The larvae can be 

 destroyed b}^ poultry or by spraying. While colza oil or petroleum 

 emulsions are satisfactory, the best results are obtained with arsenicals. 

 If the plants are sprayed with Paris green or sodium arsenite when the 

 first larv^ae appear, the latter will be killed without any injury being 

 done by the spray. 



Parasites de la Vigne : Eudemis. — La Terre Vaudoise, Lausanne, 

 xiv, no. 27, 8th July 1922, p. 347. 



Polychrosis boirana, Schiff., was first observed in Switzerland in 

 1910 in the Canton of Geneva. Since then it has spread in the vine- 

 growing areas. Being of southern origin, it is favoured by dry, hot 

 vears such as cause a decrease in the numbers of Clysia amhguella, 

 kb. ; the latter has been ver\' scarce in 1922 after the exceptionally 

 hot weather of 1921. This displacement of C. amhiguella by P. hotrana 

 is undesirable, for the latter has three generations a year, whereas the 

 former has two only. 



Miller (D.). Insect Notes : 1921-22 Season.— X.Z. //. Agric, 

 Wellington, xxiv, no. 5, 20th Ivlay 1922, pp. 294-296. 



The insect pests of fruit recorded during 1921-22 include Aemoua 

 hirta (lemon tree borer) in gooseberries and lemons, Aspidiotus epidendri 

 on palms, A. rapax (greedy scale) on various plants, Diaspis {Aula- 

 caspis) rosae (rose scale) on loganberries and raspberries, Bryobia 

 praetiosa [praiensis) (red mite) and Coccus hesperidum (soft scale) on 

 apples, Ctenopsemtis obliqnana (oblique tortrix) on apple and grape- 

 vine leaves, Eriophyes iristriatus (walnut leaf-mite) on walnut leaves, 

 Charagia virescens ("ghost moth) in nectarine trees, Oeceticus omnivorus 

 on foliage of fruit trees, Tetranychiis (Schizotetranychus) mytilaspidis 

 {citrus red spider) on lemon trees, and Cydia pomonella (codling moth), 

 Typhlocyba austral is (apple leaf -hopper) , Eriocampoides liniacina 

 (pear and cherry slug), Perrisia pyri (pear leaf -rolling midge), and 

 numerous scale-insects in orchards. 



