Show casein superior spray spreader makes it easier to give fruit complete coat of lead arsenate kid by br th united states department of aar cultum A mixture of 0 lead arsenate and water when hen sprayed on the fruit and foliage ot of a tree does not spread as aa evenly over tho the surface as Is desirable the liquid tends to collect in drops and much of 0 it rolls off to overcome t this b I 1 a certain materials known as spreaders spread era are usel used use Is new the use ot of spreaders in codling cioth mot h sprays Is comparatively new says the bureau of 0 entomology united states department of agriculture so far as Is known at present a spreader Is a desirable addition to a lead arsenate spray itla it Is po possible to control the insect just as thoroughly without the spreader as with it it Is somewhat ehat easier however hoever to give the fruit a complete coat of poison when a spreader Is included the spreader canno cannot at be depended on to make the spray go further except that without it there Is a tendency to over spray until the material collects in relatively large drops the spreader added to lead arsenate has the advantage of eliminating the conspicuous white blotches blotcher blot ches that usually appear on fruit sprayed with the arsenical alone chemical analyses show that there Is just as aa much polson poison on an apple when lien a spreader has been used as when nheu it lias has not the difference Is that the poison is mure more evenly distributed among best spreaders among the best sr spreaders readers are soap certain oil emulsions glue and casein casein Is by far the most satisfactory spreader obtainable at present in its pure form it does not mix with water and it must be combined with an alkali before it can be put into the spray tank the manufacturer generally does this but any grower can mix his own spreader by directions the department of agriculture will furnish upon application |