REPORT OF STATE ENTOMOLOGIST 1899 581 



T r e m e x and occasionally 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, 



30 Cottony maple tree scale insect (Pulvinaria innumer- 

 abilis). 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 young with kerosene emulsion or whale oil soap 

 solution. Brush or scrape off and destroy old scales. 



31 Sugar maple borer (Plagionotus speciosus). 

 Diseased or loose bark and exposed dead wood indicate the work of 

 this pest. The grubs frequently cause serious injury by running trans- 

 verse burrows just beneath the bark. The stout, black beetles, about 1 

 in. 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. 



32 Maple tree pruner (Elaph'idion villosum). Small 

 limbs of maple, oak and other trees nearly eaten off by an insect and 

 dropping in September, usually contain the burrows of this species. 



Treatment: collect infested limbs on the ground and burn before 

 spring. 



33 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 yel- 

 lowish, black-striped beetles, about j£ in. 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 and 

 in the Hudson river valley. 



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. 



34 Elm bark louse (Gossyparia ulmi). Adult females in 

 June appear like clusters of small lichens on the under side of the 

 smaller limbs of European elms. Young emerge in July. 



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



35 Elm borer (Saperda tridentata). Diseased or dead 

 bark, and in inner portions white, flattened, legless grubs, which frequently 



