561 



Brown (N. E.). Scale-insects and American Blight on Fruit Trees. — 



Gardeners' Chronicle, London, Ixii, no. 1608, 20th October 1917, 

 p. 162. 



A severe infestation of an apple tree by brown scale-insects is 

 recorded, the trunk and lower branches being so thickly covered that 

 the individual insects touched one another. Treatment consisted in 

 thoroughly scrubbing the tree from the ground upwards with a vei^^- 

 strong mixture of crude Sanitas and water ; this was allowed to dry 

 on the tree, which was then thoroughly painted with linseed oil. The 

 insects were exterminated by this means, and the following year the 

 tree increased in vigour, the old bark being thrown off. 



Patches of woolly aphis [Eriosoma lanigerum] on another tree were 

 destroyed with linseed oil and, thousrh this pest reappeared in 

 subsequent years, a further application of the oil at once controlled it, 

 mthout in any way injuring the tree. 



DoBRovLiANSKY (V. V.). CnwcoHij TJieM , BCTptMawiuiixcfl Ha Kynbjyp- 

 Hbix-b pacreHiflXTj btj XapbHOBCKOM ryOepHiu. [A List of Aphids 

 found on cultivated Plants in the Government of Kharkov.] — 



Reprint from « BionneTeHb Bpeflmejiflxi» cenbCKaro xo3flMCTBa.» 



[Bulletin on Pests of Agricidture], Kharkov, 1916, 6 pp. [Received 

 5th October 1917.] 



This list has been prepared by the author from a collection of Aphids 

 submitted to him by V. G. Averin of the Kharkov Entomological 

 Bureau ; some data on the biology of the individual species are added, 

 partly from the author's own observations. 



The following are the species dealt with : Acyrthosiphon pisi, Kalt., 

 found on Medicago sativa, L. Macrosiphum rosae, L., on roses, being 

 the most injurious of all Aphids found on this plant ; in the summer 

 it is also found on Dipsacus silvesler, Knmdia arvensis and Scabiosa 

 eolumbaria. M. granarium, Kirby {Sitobium cereal is, Kalt.), on rye; 

 there is some conflict of opinion as to the life-history of this species ; 

 according to Kollar, the %vintering eggs are laid on cereals, and this is 

 confirmed by the observations of the author, who has observed 

 ovipositing females of M. granarium on winter wheat in autumn and 

 the stem-mothers in early spring ; on the other hand, Borner regards 

 cereals only as intermediate food-plants, the wintering eggs according 

 to him being laid on roses and bramble. Mgzus cerasi, F. {aparines, 

 Kalt.), is, according to the author's observations, only a partially 

 migratory species ; in summer it migrates from plums and cherries to 

 Galium and Veronica chamaedrys, but also continues to breed on its 

 chief host-plants, although to a less extent than in the spring. 

 Chaitophorus ribis, L., occurs on red currants ; the species found on 

 black currants, which was previously mistaken for this one, has been 

 now identified by Miss Patch as a distinct species, Myzus dispar, Patch. 

 Ehopalosiphiwi ribis, Buckt. (lactucae, Kalt.), is found on flower-buds 

 of Lactuca hispida and on Sonchus, these being the intermediate food- 

 plants of this species, the chief being black currant. Hyalopierus pruni, 

 E., is found on plums, blackthorn {Prunus spinosa) and reeds (Phrag- 

 mites communis), to which last plant this species migrates in summer, 

 though continuing to breed on plimis. Rhopcdosiphum nyinphaeae, L. 



