WETTABLE, FLOWABLE, OR DUST: CHOOSING AN AGRICULTURAL SULFUR

Agricultural sulfur products are generally finely divided, averaging 93 percent through a number 325 US sieve. The formulation, not the element, decides how a product handles in the field. Here is how the three families differ and where each one earns its keep.

Wettable powders blend dispersants and surfactants into finely milled sulfur, so the powder mixes into a spray tank instead of floating on it. Yellow Jacket® 90 Wettable Sulfur II is the flagship: 90 percent sulfur, 93 percent through 325 mesh, registered with the EPA and listed for organic programs.

Flowable products are homogenized to an average particle size of 2.5 microns and suspended at six pounds of sulfur per gallon. The benefits are practical: easy measurement, easy spray application, and no irritating dust. The micronized particle also covers more leaf per pound, which is what efficacy comes down to.

Dusting sulfur goes on dry at up to 98 percent sulfur, by ground rig or by air. It is the oldest tool in the box and still the fastest way to cover a vineyard block ahead of weather. If immediate soil correction is the goal instead, degradable and bentonite forms feed sulfur as they split apart with moisture.

When in doubt, start from the crop and the applicator, then pick the particle size. Our sales team will spec the rest, and the label always governs.