352 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



the salt, let this boil for some time and then add the full quantity of 

 water. 



Uses. — For destroying the pear leaf blister mite and as a scalecide. 



Application. — On dormant wood only. In case of the pear spraying 

 must cease as soon as the bud scales are fully opened. A heavy spraying 

 is best. 



This is better than the Californian wash given below : — 



Quicklime 6 lb. 



Sulphur 3 lb. 



Salt . . . . . . . 3 lb. 



Water 10 gallons. 



Mix 1, 2, and 3 with enough water to slake the lime. While still hot 

 add more water and boil for forty-five minutes, then bring up to ten 

 gallons. 



ARSENICAL WASHES FOR MANDIBULATE INSECTS. 

 Arsenical Washes. 



A. Arsenate of Lead. 



B. Paris Green. 



C. Calcium Arsenate. 



D. London Purple. 



E. Arsenite of Soda. 



A. Arsenate of Lead. 



Formula : 



(1) Arsenate of soda (pure or crystalline) . 3^ oz. 

 Acetate of lead . . . . . . 7 oz. 



Water 10 gallons. 



(2) Arsenate of soda (dry) . . . . 2 oz. 



Acetate of lead 7 oz. 



Water 10 gallons. 



Preparation. — Dissolve both together in the water and well stir, and 

 then add 1 lb. of treacle. 



This insecticide may be obtained as a paste called Swift's Arsenate of 

 Lead Paste. 



Uses. — It destroys all biting insects, such as caterpillars and beetles ; 

 especially beneficial against winter moth, codling moth, lackey moth, 

 currant moth, gooseberry and nut sawflies, slugworm, &c. 



This wash may be mixed with Bordeaux mixture and also paraffin or 

 paranaph. 



Time of Application. — The first spraying should take place as soon as 

 the buds shows signs of bursting, and again as soon as the blossom has 

 fallen. Now and again a third spraying may be necessary, to kill gold- 

 tail and vapourer moth caterpillars, &c. It should be used as a fine spray, 

 and the spraying should cease as soon as the leaves are seen to be 

 dripping. 



