34 horticulturist's rule-book. 



off the foliage by the hose, an hour or two after the 

 application. 

 Mushroom. — Mushroom-Fly. — The larva bores through the 

 stems of the mushrooms before they are full-grown. 



Preventive. — Keep the beds cool so that the fly cannot 

 develop. When the fly is present, growing mushrooms in 

 warm weather is usually abandoned. 

 Onion. Maggot {Phorhia Ceparum^ Meigen). — Much like the 

 cabbage-maggot, which see. 



Bemedies. — Carbolic acid emulsion. Bisulphide of 

 carbon. 

 Orange. Katydid (3Iicro centrum retinervis, Burm.). — A 

 large green grasshopper-like insect, feeding upon the foli- 

 age. It is largely kept in check in some localities by a 

 parasitic chalcid fly. 



Bemedy. — Collect the eggs, which are conspicuous on 

 the borders of the leaves. 

 Leaf-Notcher {Artipus Flo7ndanus, Horn). — Beetle, one- 

 fourth inch long, greenish blue or copper-colored, eating 

 the edges of the leaves. 



Bemedy. — Jarring. 

 Mite {Tetranychus G-maculatus., Riley). — On the leaves. 



Bemedies. — Kerosene emulsion. Sulphur. Practise 

 clean culture. 

 Scale. — Many species, preying upon the leaves and shoots. 



Bemedies. — Kerosene emulsion applied with a brush or 

 in spray, just before the trees bloom, and at intervals of 

 two or three weeks as occasion may require. Lye wash. 

 Lye-and-sulphur wash. Pyrethrum decoction. Resin and 

 fish-oil soap. When young the scale is more easily de- 

 stroyed. Some species are held in check in California by 

 an Australian lady-bird beetle, which has been introduced 

 for this purpose. 

 Parsley. Parsley- Worm (Papilio Asterias., Cramer). — 

 Larva, inch and a half long, light yellow or greenish yellow 

 with lines and spots ; feeding upon leaves of parsley, celery, 

 carrot, etc. When the worm is disturbed it ejects two 



