6 



SPRAYING TO KILL NOXIOUS WEEDS. 



This subject, while somewhat foreign to the present paper, is 

 one on which information is frequently desired. Two com- 

 pounds have been used with some success here — ferrous sulphate 

 and arsenite of soda. Arsenite of soda for weed-killing is pre- 

 pared as follows : 2 lbs. of white arsenic and 6 lbs. of lime are 

 dissolved in one gallon of water and boiled for fifteen minutes. 

 Dilute one pint of this mixture with ten gallons of water, when 

 it is ready for use. Ferrous sulphate dissolves in water and is 

 used at the rate of 3 lbs. of sulphate to 1 gallon of water. 



MATERIALS AND EQUIPMENT. 



Insecticidal materials and spraying apparatus can be pro- 

 cured from (fealers in Honolulu or directly and through agencies 

 from wholesale houses on the mainland. The National Insecti- 

 cide law insures to a certain extent the validity and purity of 

 insecticides. The insecticide to use will depend on the identity 

 of the insect pest and the nature of its injury, and in this regard 

 assistance from the experiment station is always at the command 

 of the agriculturist. The variety and uses of different spraying 

 devices make the recommendation of any one impossible. The 

 grower can determine from catalogues and descriptions the ap- 

 ])aratus most useful for his purposes. Mechanical simplicity in 

 the pump and a nozzle that will give an exceptionally fine spray 

 seem to be desirable features in a machine here. 



PRACTICAL REMEDIES FOR COMMON PESTS. 



Jled spider, Thrips — Dust the leaves or fruit with powdered 

 flowers of sulphur after moistening to make the powder adhere. 



Ticks — Ticks on domestic animals should be dislodged by 

 hand and killed in kerosene. Zenoleum sprayed with consider- 

 able pressure on fowls, cattle, &c., will assist in keeping them 

 free of ticks and mites. 



"Rook lice — Book lice in stored material may be readily killed 

 with chloroform. 



