September/October 2017


Continued from Page 19

action in the soil. Typically,

this is done with soil

drenches using irrigation

water, whereby the biocidal

material is dissolved in the

irrigation water, which is

then applied at or near the

soil surface to percolate the

soil matrix. Depending on

the soil depth targeted, this

could be up to 6 inch/A of

water for a five-foot depth

of application. The key

to ensure efficacy of this

material is delivery to the

target site. Some air quality

issues limit the use of this

material. The water-drench

logistics for application

as pre-plant material in

deep-rooting perennials

somewhat hinders its’

widespread adoption.

Allyl isothiocyanate

(AITC) is the new biofumigant

active ingredient

formulated as Dominus®.

This synthetically-produced,

but chemically

identical, version of the

naturally-occurring compound

present in many

Brassica species is used

for biocidal treatments.

Although general knowledge

of plant-derived

AITC is robust, its development

as a pure-form

soil fumigation product is

recent. Currently, AITC

can be applied by shank

application or drip irrigation

(“chemigation”) for

use in annual crops, but

has less demanding labels

than the traditional soil

fumigants. For example,

Dominus has no, or very

small, buffer zones and

its use currently does

not require a written

Fumigant Management

Plan (a highly detailed,

Almond trees planted at the same time in fumigated soil (lower image)

and non-fumigated soil (upper image).

20 Progressive Crop Consultant September/October 2017

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