42 HORTICULTURIST'S RULE-BOOK. 



Rose. ROOT GALL-FLY. See uader RASPBERRY. 



MEALY-BUG. On roses, a gill of kerosene oil to a gallon of 

 water is said to be a good remedy. Syringe the plants in 

 the morning, and two hours later syringe again with clean 

 water. See also under MEALY-BUG. 



ROSE-BEETLE, ROSE-CHAFER or " ROSE-BUG " (Macrodacty- 

 lus subspinosus, Fabr.). Beetle three- fourths inch long, 

 light brown, feeding upon the leaves, blossoms, and fruit. 



, A very difficult insect to fight. Most abundant upon sandy 

 lands. Often invades fruit plantations, devouring almost 

 everything before it. All methods of dealing with it are 

 unsatisfactory. 



Remedies. Hand-picking. Knocking off on sheet early 

 in morning. Bagging. Pyrethrum. Kerosene emulsion. 

 Pyrethro-kerosene emulsion. Eau c61este. It is said to 

 prefer Clinton grapes, spireas, rose-bushes and magnolias, 

 and it has been suggested that these plants be used as a 

 decoy. Open vials of bisulphide of carbon hung in bushes 

 and vines are recommended by some. Sludge-oil soap, a 

 manufactured material. Spraying with dilute lime white- 

 wash. Hot water, at a temperature of 125 to 130 Fah- 

 renheit. To prevent the insects from breeding, keep the 

 light lands in which they breed under thorough culti- 

 vation, and especially never seed them down. 



ROSE LEAF- HOPPER (Typhlocyba Rosce, Harris). Hopper, 

 very small, white, often mistaken for thrips ; lives on the 

 leaves of roses. Various stages of growth may be found 

 in the leaves throughout the summer, and even on indoor 

 plants. 



Remedies. Whale-oil soap. Kerosene. Kerosene 

 emulsion. Nicotyl vapor. Dry pyrethrum blown on the 

 bushes when they are wet. 



San Jos6 Scale (Aspidiotus perniciosus, Comst.). A scale- 

 insect recently introduced into the East from Cali- 

 fornia (supposed to be native to Chile), living upon a 

 variety of fruit-trees. The scale is generally circular, rarely 

 a little elongated or irregular, one-sixteenth inch across 



