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 (Phorbia Ceparum, Meigen). Much like the 

 cabbage-maggot, which see. 



Remedies. Carbolic acid emulsion. Bisulphide of 

 carbon. 



Orange. KATYDID (Microcentrum 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. 



Remedy. Collect the eggs, which are conspicuous on 

 the borders of the leaves. 



LEAF-NOTCHER (Artipus Floridanus, Horn). Beetle, one- 

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

 the edges of the leaves. 



Remedy. Jarring. 

 MITE (Tetranychus 6-maculatus, Riley). On the leaves. 



Remedies. Kerosene emulsion. Sulphur. Practise 

 clean culture. 

 SCALE. Many species, preying upon the leaves and shoots. 



Remedies. 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 



