32 HORTICULTURIST'S RULE-BOOK. 



Hollyhock. BUG (Orthotylus delicatus, Uhl.). A small 

 green bug, attacking the hollyhock with great damage. 



Remedies. Kerosene emulsion. Pyrethro-kerosene 

 emulsion. 



House-Plants. See APHIDES, MEALY-BUG, MITES, and RED 

 SPIDER. 



Lawns. ANTS (Formica sp.). Insects burrowing in the 

 ground, forming "ant-hills." 



Eemedy. A tablespoonful of bisulphide of carbon 

 poured into holes six inches deep and a foot apart, the 

 holes being immediately filled up. 



Leaf-Cnimpler (Phycis indigenella, Zeller). Larva, brown, 

 wrinkled, found on leaves of various kinds, which it brings 

 together in masses and attaches them to each other and to 

 the twigs by means of silken threads. The next season 

 young worms appear from the mass and feed on the new 

 crop of leaves. 



Eemedy. Gather the masses and burn them. Arsenites 

 before the larvae cover themselves up. 



Lettuce. APHIS or GREEN-FLY. A plant-louse on forced 

 lettuce. 



Preventive. Tobacco-dust applied on the soil and plants 

 as soon as the aphis makes its appearance, or even before. 

 Renew every two or three weeks if necessary. Fumigating 

 with tobacco is the surest remedy. (See FUMIGATION, 

 Chap. I.) 



GREEN LETTUCE-WORM (Plusia Brassice, Riley). Larva, 

 somewhat over an inch long, pale green, with stripes of a 

 lighter color, feeding upon leaves of many plants, as cab- 

 bage, celery, and endive. 



Remedies. Pyrethrum diluted with not more than 

 three times its bulk of flour. Kerosene emulsion. Hot 

 water. 



Lice. See APHIDES. 



May-Beetle or May-Bug (Lachnosterna fusca, Frohl.). A 

 large and familiar brown beetle, feeding upon the leaves 

 of many kinds of trees. The common white grub is the 



