INJURIOUS INSECTS. 39 



bores a round hole in the plum, instead of making a cres- 

 cent mark like the curculio. 



Remedy. Same as for curculio. 



SCALE (Lecanium sp.). A large circular scale occurring 

 upon plum (and perhaps other) trees in New York. 



Remedy. Thorough spraying with kerosene emulsion 

 (2) (1 part to 5 of water) in the winter. More dilute 

 emulsion in midsummer when the young insects are on the 

 leaves and young shoots. 

 SLUG. See under CHERRY. 



TWIG-PRUNER. See under APPLE. 



Poplar. COTTONWOOD LEAF-BEETLE (Lina scripta, Riley). 

 A striped beetle feeding on the leaves and shoots of poplars 

 and willows. 



Remedy. Arsenites. 

 WILLOW- WORM. See under WILLOW. 



Potato. COLORADO POTATO-BEETLE (Doryphora decemlineata, 

 Say). Beetle and larva feed upon the leaves. 



Remedies. Arsenites, either dry or in spray, about a 

 third stronger than for fruits. Handpicking the beetle. 

 MOLE-CRICKET (Gryllotolpa borealis, Burm.). Mature in- 

 sect curiously formed, whitish, feeding on tubers in low 

 and mucky ground. 



Preventive. Plant potatoes on upland. 



STALK- WEEVIL (Trichobaris trinotata, Say). A grub bor- 

 ing in the stalk of the potato near or just below the ground. 

 Serious at the west and in some places eastward. 



Remedy. Burn all infested vines. 



Privet or Prim. PRIVET WEB- WORM (Margaronia quadristig- 

 malis, Gn.). Small larva feeding in webs on the young 

 shoots of the privet, appearing early in the season ; two to 

 four broods. 



Remedies. Trim the hedge as soon as the worms appear 

 and burn the trimmings. Attract the moths at night by 

 lights. Probably the arsenites will prove useful. 

 Quince. ROUND-HEADED BORERS. See under APPLE. 

 SLUG. See under CHERRY. 



