AND OTHER INJl'RIOUS INSFXTS OF I907 AND I908. 75 



may be used instead of water, adding the arsenical to it at the same 

 rate per gallon as when water is used. The lime in this fungicide 

 neutralizes any excess of free arsenic, and makes it an excellent med- 

 ium for the arsenic, as it removes liability of scalding the foliage, and 

 pcniiits ail application of the arsenical, if necessary, cigJit or ten times 

 as strong as it could be employed zvith water alone." The italics are 

 the writer's. However, as stated above, we strongly urge the use of 

 the always safe arsenate of lead in preference to Paris green. 



2. Arsenate of Lead (Disparene) sells for about the same 

 price as Paris green, remains longer on leaf and fruit, and cannot burn 

 the foliage. We regard it as far preferable to Paris green for the rea- 

 sons stated. Fig. 30 illustates apple leaves from a tree sprayed with 

 Bordeaux and Paris green in 1908, three weeks and three days after 

 spraying, during which period there was much rain. Although the 

 Bordeaux shows on the leaf, chemical analysis gave no arsenic, where- 

 as. Fig. 31 represents plum leaves, sprayed in 1908 with Bordeaux 

 mixture and arsenate of lead (three pounds to fifty gallons), the photo 

 being taken after four weeks' of exposure to rain and varying weather. 

 In this case not only does the compound show on leaf very clearly, 

 but upon chemical analysis a trace of arsenic was found. W'e have 

 the highest respect for arsenate of lead, both as regards its "staying 

 qualities," and also its freedom from the injurious burning ciualities 

 which make Paris green dangerous to foliage unless carefully handled. 

 In this connection it is to be noted that while arsenate of lead costs 

 about the same as Paris green, it is used from three to six times as 

 strong, making an application more expensive than a similar one with 

 Paris green. Yet it lasts on the foliage and fruit so much longer than 

 the latter that it calls for fewer sprayings, and would seem to be in 

 the end, fully as economical. Arsenate of lead and other spraying 

 compounds can be purchased in quantities at the leading wholesale 

 drLig houses. 



3. Paris Green: See above. In water for use on fruit trees 

 should be employed at the rate of one pound in every one hundred 

 and fifty gallons. This should be kept continually stirred, otherwise 

 the Paris green sinks to the bottom of the liquid. A pound of quick 

 lime for every ten gallons of the solution will do much to overcome the 

 burning propensity of this compound. 



4. Ivory Soap: Excellent for plant lice in the flower garden. 

 A five-cent cake cut up and dissolved in six or seven gallons of hot 



"water is excellent against lice on golden glow, sweet peas, roses, etc. 



