78 Bureau of F^uimeks' .L\.stitltes. 



29 Pigeon Tremex {Tretnex columba). Adults, frequently known as 

 " horn tails," are usually found in July around diseased and dying tree 

 trunks. The young borers occur near the surface, but full grown ones 

 may make their way to the center of even large trees. Not usually very 

 Injurious. 



Treatment: cut and burn badly infested trees. 



30 Lunate long sting {Thalessa lunator). Brownish, wasp-like insect 

 with yellow markings and a slender ovipositor or " tail " 2 to 4 inches long. 

 Frequents elms and maples Infested by the pigeon Tremex and is occa- 

 sionally found with the ovipositor stuck in the wood. The white, legless 

 grubs attach themselves to the borers and suck their life out. This insect 

 should therefore be protected. 



31 Cottony maple tree scale insect (Pulinnaria iunumcrabiUs). Under 

 side of smaller limbs sometimes festooned with this cottony insect, though 

 more frequently it occurs in small masses. Young appear in July. 



Treatment: spray with kerosene emulsion or whale oil soap solution. 

 Brush or scrape off and destroy the old scales. 



32 Sugar maple borer {Plagionottis speciosus). Diseased or loose bark 

 and exposed dead wood indicate the work of this pest. The grubs fre- 

 quently cause serious injury by running transverse burrows just beneath 

 the bark. The stout, black beetles about 1 inch long with bright yellow 

 markings, occur from June to August. 



Treatment: burn badly infested trees. Dig out the young borers in the 

 fall. Protect trees with carbolic soap wash from June to August. 



33 Maple ti-ee pruner {Elaphidion mllosum). Small limbs of maple, oak 

 and other trees nearly eaten off by an insect and dropping in September, 

 usually contain the pupae of this species. 



Treatment: collect infested limbs on the ground and burn before spring. 



Si Elm leaf beetle {Galerucella luteola). Irregular round holes eaten in 

 young foliage followed by the grubs gnawing the under portions of the 

 leaves, which then dry and turn brown. The yellowish, black striped 

 .beetles, about i/4 inch long, appear in early spring and lay eggs in May. 

 The grubs feed in June, changing to yellow pupae the latter part of the 

 month. A second brood occurs in July and extends into September. 

 Known in this State only on Long Island, in the Hudson River valley 

 and in scattered localities in central New York. 



Treatment: spray foliage of infested trees with poison, which must be 

 applied to under surface of the leaf in order to kill the grubs. Kill larvae 

 and pupae on and near trunks of the trees. 



35 Elm bark louse (Gossyparia tilmi). Adult females in June appear like 

 clusters of small lichens on the under side of the smaller limbs olJ 

 European elms. Young emerge in July. 



Treatment: spray with kerosene emulsion or whale oil soap solution. 



