Introduction

493
How it Works:
The active ingredient mono- and di-potassium salts of phosphorous acid is a phosphonate fungicide with systemic
activity to suppress pathogen inoculum. To be used as a preventative fungicide application on harvested tubers. For more
information refer to “Fungicide Modes of Action” on page 435.
Tank Mixes:
None registered.
Restrictions:
• Resistance management: Refer to page 434.
• Preharvest interval: DO NOT apply within 1 day of harvest.
• Re-entry: No restrictions listed.
• Re-cropping: No restrictions listed.
• Storage: DO NOT store near food or feed.
• Environment: DO NOT contaminate irrigation or drinking water supplies or aquatic habitats by cleaning of equipment
or disposal of waste.
Hazard Rating:
Caution – Eye irritant
For an explanation of the symbols used here see page 4.
Foliar Fungicides
Phostrol
Company:
Engage Agro Corporation – PCP#30449
Fungicide Group
33
Refer to page 437
Formulation:
53.6% mono- and dibasic sodium, potassium, and ammonium phosphites formulated as a liquid flowable.
• Container size - 2 x 10 L and 1000 L
Crops, Diseases, Rates and Timing:
Crop: Diseases: Application Rate Application Timing:
Potato Suppression of pink rot
2.3 to 4.7 L In-furrow: Apply in a band at planting directly over
(Phytophthora erythroseptica)
per acre the seed pieces prior to row closure.
Control of late blight
(Phytophthora infestans)
Suppression of pink rot
(Phytophthora erythroseptica)
Control of late blight (Phytophthora
infestans), pink rot (Phytophthora
erythroseptica)
1.2 to 4.7 L
per acre
2.3 to 4.7 L
per acre
0.42 L in 2 L
water to
1 tonne tubers
Foliar applications: For preventative control of
late blight and preventative suppression of pink
rot begin applications when conditions favouring
disease development exist and continue on a
7 to 14 day interval.
Post harvest control: Apply directly to the tubers
and ensure complete and even coverage.