58 REPORT ON INJURIOUS INSECTS FOR 1904. 



GENERAL NOTES ON OTHER INJURIOUS INSECTS, ETC. 



GALLS ON ELM LEAVES. A correspondent forwarded leaves 

 of Elm from Whitchurch, near Strat ford-on- A von, with the well- 

 known galls of Tetraneura ulmi, De Geer, or the Elm Gall Aphis, 

 stating " our young Elms are attacked rather badly, at least half 

 the leaves are affected." 



Young trees should be gone over carefully before the galls 

 open, and picked off and burnt. Spraying with paraffin emulsion 

 in the spring and as soon as the winged forms appear, is the only 

 other remedy I know of. 



GALLS ON LIME TREES. From Whitchurch the correspond- 

 dent referred to above, forwarded twigs of Lime with galls not 

 unlike those on the Elm leaves, but in this case they were on the 

 leaf stalks. The insect forming these is, however, very different 

 to that which produces galls on the Elm leaves. It is a Dipterous 

 fly known as Cecidomyia tiliae, Schrk. 



RED " SPIDER " ON GOOSEBERRY BUSHES. In March a 

 correspondent at Evesham reported that this mite (Tctranychus 

 telarius, Linn.), was proving troublesome on Gooseberry bushes. 

 Spraying with a fairly strong solution of soft-soap was recom- 

 mended. 



THE ELM LEAF APHIS. Leaves of Ulmus campestris were 

 received, filled with the winged viviparous females of Schizoneura 

 ulmi, Linn. The presence of this insect may generally be 

 determined by the curling of the leaves from above downwards so 

 as to form a roll of a sickly yellowish-green colour. Spraying 

 with paraffin emulsion in the spring and again when the winged 

 forms appear, is the best remedy I know of. After the fall of 

 the leaves the bark should be well sprayed with soda and potash 

 to destroy the eggs. 



WILLOW LEAF GALL SAWFLY. The galls of Nematus galli- 

 cola (Westwood), have been received from numerous corres- 

 pondents throughout the Midlands. An examination of a large 

 number of leaves gave an average of eight galls per leaf, the 

 minimum being one and the maximum twenty- two. Cameron (t) 

 states that the greatest number observed by him on a leaf 

 as thirteen. He also states that the galls '' are always placed on 

 the edges of the leaf," but from observation I find this is not invari- 



i. Brit. Phytop. Hymen., 1885, vol. ii, p. 203. 



