INSECTICIDE FORMULi^. 23 



minutes, and then suddenly turning it into 50 gallonis of 

 cold water and stirring thoroughly. It has been used 

 successfully on cinerarias and marguerites. The spray- 

 ings were made five or six times during the season. 

 Growers of celery might try it against the Celery Fly 

 which causes so much damage to the crop. 



Uses. — See above remarks. 



Time to Apply. — Spring and summer. 



18. Powder Insecticides.— The use of fungicides 

 and insecticides in the form of fine powders applied in the 

 dry state is not very widespread, and in this country is 

 almost confined to the application of sulphur or lime and 

 sulphur mixed. The writer has tried a mixture of straw- 

 sonite and lime (slaked and sifted finely) on potatoes, with 

 very good results in protecting the crop from disease. 

 A mixture of two parts sulphur to one of slaked 

 lime has been recommended by the Board of Agriculture 

 for the treatment of Onion Mildew. The best way of 

 applying the powder is by means of a powder pump, at 

 least two makes of which are to be had in the handy 

 knapsack form. The lime-and-sulphur mixture is most 

 us-eful for dusting among plants to prevent damping off. 

 Pyrethrum powder and hellebore are also applied dry in 

 some cases. 



Time to Apply. — In summer. 



19. Soil Disinfectants. — Following are remedies 

 for disinfecting soil in which diseased tomatoes or plants 

 have been grown: Carbolic, 1 gallon to 50 gallons of water, 

 used when the land can be allowed to rest for one month 

 before the next crop. Permanganate of potash, lib. to 

 50 gallons of water. Planting may take place as soon as 

 the borders are dry enough. The writer has watered a 

 tomato growing in a pot with this strength, giving three 

 waterings, one after the other, without hurting the plant. 

 One pound of permanganate to 100 gallons of water may 

 be safely used for watering purposes, and will be bene- 

 ficial to the crop. 



