344 



takes place in the leaf-axis of rape, cabbage and Mathiola incana. 

 The beetles drop when the plants are gently shaken and are easily 

 captured by means of tarred boards. Another larva injurious to 

 the stems is that of the weevil, Baris chlorizans, Germ., the hibernating 

 adults of which deposit their eggs in spring in the stems of young 

 rape and beet, near the leaf-axis. All stumps of rape, beet and 

 cabbages should be pulled up and burnt immediately after harvesting. 

 The flowers of cruciferous plants are attacked in May by Meligethes 

 aeneus, F. This beetle may be captured like P. chrysocephala ; in 

 pre-war times dusting with a mixture of 1 part insect powder and 

 2 parts flowers of sulphur was resorted to. Ceuthorrhynchus asswiilis, 

 Payk., also gnaws the flowers and buds. Its larva feeds on the pistils 

 di the flowers and on the unripe seed of the yoimg pods, which then 

 open prematurely. The injury resembles that oiPerrisia{Dasyneura) 

 brassicae, Wied. (cabbage gall- midge), but the larvae of P. brassicae 

 are found in numbers (up to 50-60) in a pod, whereas that of 

 C. assimilis occurs singly. No remedies are known against either of 

 these pests, which, however, do less damage than the caterpillars of 

 Evergestis extimalis, Scop., which feed on the seeds and pods of rape, 

 radish, cabbage and mustard. Deep ploughing after the harvest 

 destroys the overwintering caterpillars. The caterpillars of Phalonia 

 (Conchylis) epilinana, Zell. , attack flax-seeds in their capsules. Infested 

 flax must be threshed out soon after the harvest. In some years 

 the foliage of rape, mustard and flax is seriously injured by the larva 

 of the sawfly, Athalia colibri {spinarum), which also lives on all varieties 

 of cabbage and on many weeds. Collection of the larvae or their 

 destruction by cultural methods when hibernating in the soil are the 

 measures advised. Euxoa (Agrotis) segetum proved especially harmful 

 in Germany in 1917. Ceuthorrhynchus sulcicollis, Gyll., oviposits in 

 May in the roots of rape and the larva is. enveloped in a gall which 

 reaches the size of a hazel-nut. After about a month the larva bores 

 its way out and pupates in the ground ; the beetles emerge about a 

 month later. All stumps should be pulled up and burnt immediately 

 after the harvest and ploughing, rolling and harrowing are also useful 

 measures. 



Mazieres (A. de). Nouveau Proc6d6 de Destruction de la Mouche de 



rOlive. [A New Method of Destruction of the Olive-fly.] — Rev. 

 Hortic. de VAlgerie, Algiers, xxii, nos. 4-5, April-May 1918, 

 pp. 62-63. 



This paper describes the device invented by Lotrionte for trapping 

 the adults of Dacus oleae [see this Review, Ser. A, ii, p. 289], and 

 gives recommendations for preparing and applying the poison [see 

 this Review, Ser. A, ii, p. 452]. 



Yano (M.). Nekirimushi no tekichu ni tsuite. [On the Insect Enemies 

 of Root-cutting White Grubs.] — Ringyo Shiken Hokoku. [Report 

 of Forest Experiments], Imperial Bureau of Forestry, Toki/o, 

 no. 17, 30th March 1918, pp. 59-66, 1 plate. 



White grubs, or the larvae of Lamelhcorn beetles, are known to do 

 formidable damage to the roots of young forest trees, sugar-cane 

 and many farm crops. There are no known eft'ective measures against 



