Injurious Insects. 35 



Potato. Colorado Potato-Beetle (Doryphora decemlineata 

 Say). — Beetle and larva feed upon the leaves. 

 Remedies. — Arsenites. Hand-picking the beetle. 

 Mole-Cricket {GrylloMpa borealis, Burm.). — Mature insect 

 curiously formed, whitish, feeding on tubers in low and 

 mucky ground. 

 ■ Preventive. — Plant potatoes on upland. 

 Stalk- Weevil (Trichobaris trinotata, Say). — A grub boring in 

 the stalk of the potato near or just below the ground. Seri- 

 ous at the west and in some places eastward. 

 Remedy. — Burn all infested vines. 



Privet or Prim. Privet Web- Worm (Margarodes 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 Apples. 

 SLUG.^See under Cherry. 



Radish. Maggot {Anthomyia raphani, Harris). — Indistinguish- 

 able from the cabbage-maggot, which see. Sowing copperas 

 upon the soil before planting is sometimes adopted as a pre- 

 ventive of attack. 

 Raspberry, Cane-Corer {Oberea bimaculata, Oliv.). — Beetle, 

 black, small and slim; making two girdles about an inch 

 apart near the tip of the cane, in June, and laying an egg 

 just above the lower girdle ; the larva, attaining the length 

 of nearly an inch, bores down the cane. Also in the black- 

 berry. 



Remedy. — As soon as the tip of the cane wilts, cut it off at 

 the lower girdle and burn it. 

 Raspberry Root-Borer (Bembecia marginata, Harris). — Larva 

 about one inch long, boring in the roots, and the lower parts 

 of the cane, remaining in the root over winter. 

 Remedy. — Dig out the borers. 

 Raspberry Saw-Fly (Selandria rubi, Harris). — Larva about 

 three-fourths inch long, green, feeding upon the leaves. 

 Remedy. — Hellebore. Arsenites, after fruiting. 



