42 horticultukist's rule-book. 



Rose. Root Gall-Fly. — See under 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 " {Macrodactij- 

 lus siibspinosus, Fabr.). — Beetle three-fourths inch long, 

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

 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. 



Bemedies. — Hand-picking. Knocking off on sheet early 

 in morning. Bagging. Pyrethrum. Kerosene emulsion. 

 Pyrethro-kerosene emulsion. Eau celeste. 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 {Typlilocyha Bosce, 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. 



Bemedies. — Whale-oil soap. Kerosene. Kerosene 

 emulsion. Nicotyl vapor. Dry pyrethrum blown on the 

 bushes when they are wet. 

 San Jos^ 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 



