74 Tin-: appli-: leaf ]I()Ppi-:r 



culio, codling irotli. lent caterpillar, canker worms, etc. We much 

 prefer arsenate of lead to Paris green. If Paris green is used it should 

 be of good qrality. Insist upon Paris green being sold you in sealed 

 packages ; do not purchase an article which looks pale green. If an 

 eighth of a teaspoonful of Paris green is placed in a wine glass full 

 of strong ammonia, and stirred with a stick sharpened to reach the 

 lowest point of the liquid, it turns the latter blue, and there should 

 be little or no sediment in the glass after stirring. The presence of 

 sediment indicates adulteration. Minnesota would do well to enact 

 laws preventing the sale of adulterated Paris green. 



Arsenical sprays (Paris green or arsenate of lead) being infernal 

 poisons, should never be used against sucking insects, such as plant 

 lice, scale insects, squash bugs, etc. Use soapy solutions, or kerosene 

 emulsion for lice ; crude petroleum or lime-sulphur solution on dor- 

 mant trees for scale insects. 



Paris green, when added to Bordeaux mixture, can be safely 

 used in greater proportion than one pound to one hundred gallons, 

 and we believe, v\'ith profit. Inasmuch as it is the minute particles of 

 Paris green adhering to leaf and fruit which the insect eats with fatal 

 results, it follows that the more of such particles there are to a square 

 inch of surface the greater the chance of a pest, the apple worm, for 

 instance, getting the poison before it gets out of danger, inside the 

 apple for example. It would be unsafe for a fruit grower to use, on 

 his fruit trees, P'aris green and water alone, stronger than one pound 

 to every one hundred and fifty gallons, but if lime were added the acid 

 burning qualities of the fatal arsenic in this compound would be neu- 

 tralized in ])ropcrtion to the amount of lime used, and might be entirely 

 done away with. 



The 3-3-50 Bordeaux mixture docs this, and we have personally 

 used one pound of Paris green in every fifty gallons of this mixture 

 as a spray upon tender foliage of apple and plum as well as upon 

 young tomatoes in the greenhouse. We have preferred, however, in 

 this report, to conform to the more conservative views of some of 

 our fruit growers, and have advised one pound of Paris green in every 

 one hundred gallons of the above mixture. JVe strongly urge the use 

 of arsenate of lead in prefcrcjice to Paris green. 



In this connection it is interesting to note the remarks of Dr. Mar- 

 latt in Farmers' Bulletin No. 127, issued by the U. S. Department of 

 Agriculture, April 14, 1908, in which he states (p, 11) that "If it be 

 desirable to apply a fungicide at the same time, as on the apple for 

 the Codling Moth and the Apple Scab Fungus, the Bordeaux mixture 



