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
FLUTOLANIL
Stable pH 3.0 - 11.0
CHLOROTHALONIL/AZOXYSTROBIN
FENARIMOL CYAZOFAMID
7
Decompose in acidic solutions
SEGWAY
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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