No. 6. DEPAKTMKNT OF AGRICUI.TIIRE. §47 



Tor Ibeir insect pests. It is in common use. Tlie lioi-deaux mix 

 ture itself without the Taris green is a fungicide rather than an in- 

 secticide. The former is made as follows: 

 4 pounds copper <^ulphate (blue vitriol). 

 4 pounds unslaked lime. 



25 gallons of v»'ater ("full strength solution"), or 



50 gallons water ('iuilf strength solution"). 



Do not use metal. Dissolve the copper sulphate in water. Solu- 

 lion can be hastened by heating. Slake the lime separately in 

 enough water to make a "cream." Pour the copper solution in(o the 

 larger vessel of water, and strain the "milk of lime" into it through 

 a fine sieve or cloth, stirring the liquid into which it is strained. 



Whenever lime is to bo used iu any substance to be applied as a 

 ^pray it should first be strained carefully to prevent it clogging the 

 nozzle. 



To complete the mixture as an insecticide use four ounces of 

 Paris green to every fifty gallons of the Bordeaux mixture as made 

 according to the formula here given. 



This mixture is particularly recommended for Thrips, Flea-beetles, 

 etc. 



B. Contact Applications, for Suctorial Insectt*. 



6. Kerosene Mixture with Water. It has recently been determined 

 that it is not necessary, in combatting most insects, to take the 

 ti'ouble of making a kerosene emulsion (7), as a mere meclianical mix- 

 ture of oil and water is sufficient if the kerosene is thrown in a very 

 fine spray. The mixing is done by the apparatus as it throws the 

 spray, the kerosene being carried in a vessel separate from the water. 

 Several devices for this purpose are now on the market, but one of 

 the best is the Kerowater Knapsack Sprayer. It can be purchased 

 of most dealers. It can be set to make the mixture of any desired 

 percentage. For Cucurbits it should not be used above eight per 

 cent., and five per cent, will generally be found strong enough. 

 Wherever the insects are not on plants that are to be kept growing 

 ii can be increased to twenty per cent, and will then prove certain and 

 speedy death. It is particularly recommended for Squash-bugs. 

 Even though plants are to be burned after frost, they should first be 

 well sprayed with a strong mixture to kill the bugs that then col- 

 lect on thera and would remain over winter to infest the next spring's 

 crop. 



7. Kerosene Emulsion. This is a famous remedy for all kinds of 

 suctorial insects. Formula: 



I pound hard common coni'se laundry soap. 



1 gallon water. 



2 gallons kerosene. 



