627 



Boas (J. E. V.). Bladfald fra B0g i Juni. [Fall of Beech Leaves in 

 June.l — Fra Skovcn os, Traemarkedd, Copenhagen, iii, no. 14, 

 15th July 1921, pp. 10Vl07. 



Rhynchaenus {Or chest es) fagi was exceedmgly common in 1921 in 

 the Danish beech forests. The brown marks on the leaves indicating 

 larval mines were so numerous that the forests had a brownish hue. 

 The attacks also seriously affected the development of the nuts. The 

 most characteristic damage was, however, met with on the petioles 

 and median ridges of the leaves, which were gnawed to such a degree 

 that the petiole was broken, resulting in a heavy fall of the leaves 

 and a serious check to the growth of the trees. 



Thomsen (M.). B0geloppen i Skoven og Fmgthaven. [Rhync-haenus 



fagi in Forest and Orchard.] — Ent. Medd., Copenhagen, xiii, 

 no. 7, 1921, pp. 336-337. 



In addition to the damage to beech forests recorded in the foregoing 

 paper, Rhynchaenus (Orchestes) fagi in 1921 in Denmark also infested 

 the fruits of apple, pea,r, cherry and plum. Holes of some size were 

 gnawed in the fruits, as many as thirteen individuals occurring in 

 a single hole, with the result that a great quantity of fruit became 

 imsaleable. 



RosTRUP (S.). Om Krusesyge i Guler0dder og korsblomstrede Kultur- 

 planter. [On Curlv-leaf Disease in Carrots and culti\'ated 

 Crucifers.] — Beretning om Nordiske J ordhrugsforskeres Forenings 

 Kongres i K0benhavn, Jtdi 1921, Copenhagen, 1922, pp. 301-312, 

 2 figs. 



The results formerly published \R.A.E., A, ix, 452] on curly-leaf 

 disease in carrot, due to Trioza viridida, are reprinted. Spraying with 

 a solution of tobacco or nicotine sulphate containing • 1 per cent, 

 nicotine is recommended against the ovipositing females just when 

 the leaf curl begins to appear ; this must be repeated twice at intervals 

 of 10 days to destroy the larvae. The attacks in Denmark were heavy 

 in 1900-10, and again in recent years, especially in 1920. 



As regards curly-leaf disease in crucifers, due to Contarinia nasturtii, 

 the results of Taylor and Dry [R.A.E., A, iii, 500] are recorded and 

 confirmed. Serious outbreaks in Denmark were recorded in 1918 

 on swedes, and subsequently especially on cauliflowers, fields planted 

 in April 1920 being nearly destroyed. The curled leaves caused the 

 young heads to decay. Early sown fields were the most heavily 

 attacked. As the midges do not fly well or far, the distance from a 

 field infested the preceding year is of great consequence. No effective 

 spray has as yet been found. 



Brethes (J.). Seccion Entomologica. [Report of the Entomological 

 Section.] — Mem. Trab. Inst. Biol. Sac. Rur. Argentina, 1921-22, 

 Buenos Aires, 1922, pp. 40-43. 



Against Eriosoma (Schizoneura) lanigeriim, Hausm., biological con- 

 trol by means oi Aphelinus mali, Hald., promises to be very successful. 

 In timber a Cerambycid, Hylotrnpes bajuhis, L., imported from Europe, 

 is one of many injurious borers: An insect that occurred in large 

 numbers and was suspected of being a pest was found to be a Melyrid 

 beetle, Astylus quadrilineatus, Germ., which is beneficial as a destroyer 



