Pacific service magazine . Prune orchard near Yuba City. The tree in the foreground shows the result of sulphur compound treatment for red spider infestation. The trees in the background were not sprayed. Pacific Service Magazine 401 erties: first, thefineness of division of the sulphur particles;second, a certaincontent of volatile tarry matterwhich is retainedin the sulphurwhen It is re-covered from thesolution withwhich the gas isscrubbed. Thesize of the suhphur particles issmaller than anytype of sublimedor ground sul-phur on the mar-ket and is finer,even, than anyprecipitated sul-phur wit
Pacific service magazine . Prune orchard near Yuba City. The tree in the foreground shows the result of sulphur compound treatment for red spider infestation. The trees in the background were not sprayed. Pacific Service Magazine 401 erties: first, thefineness of division of the sulphur particles;second, a certaincontent of volatile tarry matterwhich is retainedin the sulphurwhen It is re-covered from thesolution withwhich the gas isscrubbed. Thesize of the suhphur particles issmaller than anytype of sublimedor ground sul-phur on the mar-ket and is finer,even, than anyprecipitated sul-phur with which. Pressure tank and coolers for separating benzol from gas. it has been compared. This extreme fine-ness is a distinct advantage in agriculturalusages, either as a spray or dust in control-ling pests, in fertilizing soil and in neutral-izing alkali, because the activity in all theseuses is largely dependent upon the size ofthe particle. The smaller the particle themore quickly it will volatilize and hencegive better action on mildews and rusts, andthe more readily will it enter chemical re-action in soil treatment. These minute par-ticles also adhere to foliage better, the sur-face coverage is better and there is lesstendency to wash off with light rains. A very extensive program of field testshas been undertaken. In the summer of1926 both spray and dust were used uponcantaloupe mildew in the Imperial Valley,grape mildew in the San Joaquin Valley andin several localities upon red spider attack-ing prunes, beans and ornamental trees in Berkeley are now being sprayedfor the con
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