CONFERENCE ON FRUIT GROWING. 



31 



It is the same with caustic washes and with most arsenites, and "even 

 delicate foliage is injured by soft soap. 



During the past season I have tried against these the effects of 

 vegetal insecticides, and have found that at almost any strength delicate 

 plants are not affected by them. 



There are three well-known vegetal insecticides : tobacco, hellebore, 

 and pyrethrum. Both hellebore and pyrethrum are known poisons for 

 mandibulate insects, and I have recently found that excellent results can 

 be obtained with tobacco wash. 



The subject of these vegetal washes is one that I think growers and 

 others might well pay some attention to. There is no doubt that waste 

 tobacco can be obtained very cheaply, and its importation free of duty for 

 such purposes would, no doubt, be sanctioned. It certainly is a most 

 effective general insect-killer, and has the advantage of being quite harm- 

 less to vegetation. 



Sfhce these remarks were made I have tried vegetal oils for scale 

 insects at Mr. Bunyard's suggestion, and find the results most satisfactory ; 

 the cost, however, prohibits their use except for special purposes. — F. V. T. 



Appendix. 



The following washes have been referred to in this paper : 



Lime, Salt, and Sulphur Wash. 

 Quicklime ... 7 lbs. a. Boil half lime with sulphur in 3 galls. 

 Sulphur .... 3 lbs. of water, 1 hour. 



Salt ..... 3 lbs. b. Rest of lime and salt, add a to b, and 

 Water .... 10 galls. then add the rest of the water. 



Arsenate of Lead Wash. 



Acetate of lead 2§ ozs. 



Arsenate of soda . . . . . . . 1 oz. 



Water 10 galls. 



Treacle . . 1 lb. 



Hellebore Wash. 



Hellebore 2| lbs. 



Water . . . . . . . . . 10 galls. 



Caustic Wash. 



Soda carbonate (98 p.c.) ..... 3 lbs. 



Potash carbonate (98 p.c.) . . . . . 1 lb. 



Soft soap 3 lbs. 



Water 10 galls. 



Tobacco Wash. 



Tobacco . . 2 lbs. 



Water . . 10 galls. 



Pyrethrum Wash. 



Pyrethrum ... 2 lbs. Infuse the pyrethrum for 3 hours and 

 Water .... 10 galls. add the water to it warm. 



Mr. F. Smith (Loddingfcon, Maidstone) : I have ceased to band trees 

 for the destruction of winter moth, except in the case of large orchard 



