2022 Harrell's Coastal Plains and Southeast Resource Guide

Fungicide pH Guidelines

Half-Life at Various pH Levels

Optimum pH

Needs Buffer

Pesticide Brand Name

Generic Product Name

Alkaline

Neutral

Acidic

9.0

8.0

7.0

6.0

5.0

JUNCTION®

COPPER HYDROXIDE & MANCOZEB

5

YES NO NO NO NO NO NO NO NO YES YES NO NO NO

Optimum pH range 4.0–7.0

KOCIDE

COPPER HYDROXIDE

6.5

MEDALLION PALLADIUM

FLUDIOXONIL

CYPRODINIL/FLUDIOXONIL

PENTATHLON DF

MANGANESE/ZINC/ ETHYLENEBISDITHIOCARBAMATE

PROSTAR® RENOWN RUBIGAN SEGWAY

FLUTOLANIL

Stable pH 3.0 - 11.0

CHLOROTHALONIL/AZOXYSTROBIN

FENARIMOL CYAZOFAMID

7

Decompose in acidic solutions

SPECTRO™ 90 SUBDUE MAXX®

CHLOROTHALONIL, THIOPHANATE-METHYL

6.0–7.0 5.0–9.0

Buffer to a pH of 6.0 to 7.0 prior to addition of 3336

METALAXYL

Buffer to a pH of less than 7.5

TARTAN

TRIFLOXYSTROBIN/TRIADIMEFON

TERRAZOLE®

ETRIDIAZOLE

Stable over wide pH range

ZERO TOL

HYDROGEN DIOXIDE

9/19

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