DEPARTMENT OF AGRICULTURE. 



. _ 



the market at the present time, a large number can be discarded, which do not come 

 up to the best ones when considered from the above factors. New sprays are being 

 frequently advertised, and the growers are warned against their extensive use until 

 they have been tried and proved safe, economical, and successful by the experiment 

 stations. A great deal of damage has been done in the past through the use of new 

 sprays before they had been thoroughly tested by the experiment stations. 



INSECTICIDES. 

 >B THE COATBOL. OF BlTISG-IXSECTS.) 



Arxenate of Lead (Paste Form). Two to four pounds to 40 gallons of water. 

 Keep the lead covered with water so it will not dry out. Stir well the required 

 amount of poison with a small amount of water before adding to the spray barrel 

 or tank, so as to ensure a good mixture. 



Ar*etuitf of Lead (Powdered Form). Seldom used in this country and not 

 recommended in this bulletin in any of the forniulte given. This form is twice as 

 strong as the paste form, and should any one desire to use it only one-half the 

 quantity of paste should be used. One to two ] omuls to 4O gallons of water. 



White Hellebore. Loses its poisoning properties after being exposed to the air. 

 Sometimes for this reason it can be used on small fruits and on plants when the 

 fruit is just about ready to be picked with much more safety than the mineral 

 poisons. This also shows the necessity of using fresh material from which the air 

 has been excluded. Can be used either in the powdered form or diluted with water, 

 oz. to 2 gallons of water. 



Paris Gnen. Much less satisfactory than arsenate of lead. It washes off the 

 plants easier, does not spread so well, and sometimes burns foliage. Used occasion- 

 ally against insects that require a large amount of poison to kill them. It should 

 not be used with lime and sulphur, but may be used with Bordeaux, which usually 

 carries an excess of lime. 



Paris green is usually used at the rate of about % Ib. to 40 gallons of water. 

 It is always well to mix about 1 Ib. of freshly slaked lime in the water and let stand 

 a while before using. This will overcome the danger of burning to a large extent. 

 It can also be used in the powdered form and dusted on the plants to be treated. 

 This is best accomplished in the morning before the dew has dried off the plants. 



Cai1toli<- 'ilxion. dissolve 1 Ib. of hard soap, shaved fine, in 1 gallon 



of boiling water: add 1 pint of crude carbolic acid and churn violently. For use. 

 dilute to 25 gallons. Sometimes used around the base of cabbage-plants to destroy 

 the cabbage-maggot. 



-'/nod Bran-maxh. Fur use in the control of cutworms. Mix well 1 Ib. of 

 Paris green with 50 Ib. of bran, moisten to the consistency of fresh sawdust, and 



ten with a little sugar or molasses. 



CONTACT INSECTICIDES. 

 (FOB THE COXTBOL OF SfCKIXG-IXSEi - 



(1.) Forty-per-eent. yicotiite Sulphate (Black Leaf W). This is a liquid prep- 

 aration made from tobacco-stems and waste material in the large tobacco plants, and 

 is put up in various size tins. The best-known form is the proprietary " Black Leaf 

 40." For the control of green aphis % pint of the nicotine solution and 3 to 5 Ib. 

 of soap in 100 gallons of water. In mixing soap, shave it fine and dissolve in hot 

 water so that it will mix readily. Fr woolly aphis and rosy apple-aphis use 1 pint 

 nicotine sulphate and 4 or 5 Ib. soap to 100 gallons water. 



Whale-rjil $oap and QMa##ia-ehip* 



Whale-oil soap 1 Ib. 



Quassia-chips 1 Ib. 



Water . 12% gals. 



