University of Missouri Extension

G1921, Reviewed October 1993

Temperature Effects on Storage of Agricultural Pesticides

Fred Fishel
Department of Agronomy

The normal temperature range recommended for storing liquid pesticides is usually 40 to 100 degrees Fahrenheit. Some pesticide labels state the specific temperature range for maintaining optimal storage shelf life. Temperature extremes in the pesticide storage facility can potentially pose several problems.

Temperature extremes in storage can reduce the effectiveness of pesticides. Freezing of liquid pesticides can result in separation of the active ingredients from the solvents or emulsifiers, or inactivation of emulsifiers, which may lead to crystallization or coagulation of the pesticide. The freezing point of many pesticides is lower than 32 degrees Fahrenheit due to the hydrocarbon solvents or inert ingredients. Some pesticides may be thawed after being frozen, the container rolled, shaken or otherwise agitated to resuspend the contents. Call the manufacturer for advice on reusing specific pesticides if frozen. Excessive heat can cause some pesticides to volatilize and drift away from the storage site. Additionally, some pesticides are flammable.

Temperature extremes can also damage the integrity of the pesticide container. Freezing temperatures can cause glass, metal and plastic containers to break. High temperatures can cause plastic containers to melt and some glass containers to explode.

As a rule, wettable powders and granules are not affected by low temperatures. Moisture is the greatest factor affecting their storage, as it can cause caking that may reduce the effectiveness of the pesticide. Products formulated in water-soluble packets have a high affinity for moisture and become brittle when frozen. If handled when brittle, bags may break open; these products should be stored in a warm, dry area.

Before storing pesticides, the applicator needs to read the "storage and disposal" section of the pesticide label. Many pesticide labels provide specific storage information. The following precautions should be used in the storage of all pesticides:

Fungicides and seed protectants: Storage temperature guidelines
Product Comments
AS-50 Storage should be at a cool temperature with minimum exposure to the atmosphere.
Agri-mycin 17 Storage should be at a cool temperature with minimum exposure to the atmosphere.
Aliette/Maneb 2+2 If allowed to become wet the product will deteriorate and represent a fire hazard. Keep away from sources of ignition (e.g., sparks or open flame).
Benlate Do not allow to become wet.
Benlate SP Do not allow to become wet.
Bravo (all products) Protect from excessive heat.
Captan 50-WP Protect from excessive heat.
Captec 4L Protect from excessive heat. Protect from temperatures below 0F.
Dithane DF and M-45 Do not allow to become wet or overheated.
Dithane F-45 and ST Do not store below 32F. Do not allow to become overheated.
Dithane WSP Do not store below 32F. Do not allow to become wet or overheated.
Enable Do not store below 32F.
KickStart Do not allow to freeze or become overheated.
Kumulus Do not store above 104F.
Maneb 75DF and 80WP Do not allow to become wet or overheated.
Manex II Do not store below 32F.
Mertect LSP Repeated freezing and thawing should be avoided.
Nova 40W Water-soluble pouch may become brittle at storage temperatures below 32F; but the fungicide is not affected.
Nu-Cop 3L Do not store below 32F.
Penncozeb 75DF and 80WP Do not allow to become wet.
Rubigan E.C. Avoid freezing.
System3 Do not store in direct sunlight. Protect from extreme temperatures.
Terraclor Granular and WP formulations Store in a dry location.
Terraclor Emulsifiable Protect from temperatures below 20F.
Terranil S Protect from excessive heat. Frozen product generally can be restored after thawing and thorough mixing.
Trilogy Do not store below 40F.
Vitavax M DC Protect from excessive heat.
Herbicides: Storage temperature guidelines
Product Comments
Accent Gold Do not store above 122F for extended periods of time.
Accord Store above 10F to keep product from crystallizing.
Alanap-L Store between 60 and 80F. This product should not be stored below 60F, or it may crystallize or precipitate.
Amine 4 2,4-D Do not store below 25F.
Aquathol K Storage at temperatures below 32F may result in the product freezing or crystallizing.
Arsenal (all formulations) Do not store below 10F.
Assert Keep from freezing. Do not store below 40F.
Asulox Store above 20F.
Balan DF Do not store in direct sunlight. Do not store above 120F.
Balance WDG Do not store under wet conditions.
Barrage HF Do not store below 0F.
Basagran Do not allow product to freeze.
Beacon Do not store under wet conditions.
Blazer Do not store below 32F.
Broadstrike + Treflan Avoid freezing. Store above 40F.
Bronate Store at temperatures above 3F.
Buctril (all formulations) Store at temperatures above 3F.
Bullet Store above -4F to keep product from freezing.
Chopper Do not store below 10F.
Command 3ME Store above -4F to keep product from freezing.
Command 4EC Do not freeze. Do not store below 40F.
Conclude Ultra Do not store below 32F or above 100F.
Conclude Xtra B Keep from freezing. Do not store diluted spray. Store above 32F.
Conclude Xtra G Keep from freezing. Store above 32F.
Contour Keep from freezing. Do not store below 32F.
Crossbow Store above 10F or agitate before use.
Curbit EC Avoid freezing. Store above 40F.
Curtail Store above 40F or warm and agitate before use.
Curtail M Store above 10F or warm and agitate before use.
Cyclone (both formulations) Store at temperatures above 32F.
Ded-Weed SULV Keep from freezing. Do not store near other herbicides, fertilizers, insecticides, fungicides, or near seeds.
Detail Do not store below 32F. Keep from freezing.
Diquat Store at temperatures above 32F.
DoublePlay Can be stored at temperatures as low as -25F.
Dual: Magnum, II Magnum, and II Magnum SI May be stored at temperatures down to -30F.
Eptam 7-E Can be stored at temperatures as low as -50F.
Eradicane 25-G and 6.7-E Can be stored at temperatures as low as -50F.
Exceed (Custom-Pak) Do not store under wet conditions.
Facet 75 DF Do not store under wet conditions. Handle carefully when stored at temperatures of less than 50F to avoid breaking bags.
Facet GR Do not store under wet conditions.
Field Master Do not store this product or spray solutions of this product in galvanized steel or unlined steel containers or spray tanks.
Flexstar Store above 45F.
Freedom Store above 32F to keep product in solution.
Frontier Heated storage is required in bulk systems and recommended in mini-bulk systems and not required for 2 x 2.5 gallon package size.
Fultime Can be stored at temperatures as low as -30F.
Galaxy Keep from freezing. Store above 40F.
Goal 2XL Keep from freezing. Store above 32F.
Gramoxone Extra Store at temperatures above 32F.
Grandstand R Store above 28F or agitate before use.
Hoelon 3EC Do not store below 20F.
Hornet Do not store above 122F for extended periods of time.
Kerb 50-W Store in a cool, dry place but not below 32F.
Laddok S-12 Do not store below 10F or above 100F.
Landmaster Store above 40F to keep product in solution.
Lariat Store above 40F.
Lasso 4EC Store above 32F to keep product in solution.
Lasso II Granules Below 32F this product can cake.
Liberty Storage temperature should be 32-85F, with a maximum of 125F. Protect against direct sunlight.
Low Vol 4 Do not store below 0F.
Manifest (B and G formulations) Keep from freezing. Store above 40F.
Micro-Tech Store above -4F to keep product from freezing.
Moxy 2E Store at temperatures above 3F. If allowed to freeze, remix before using.
NorthStar Do not store under wet conditions.
Opti-Amine Protect from freezing. If stored below 32F and crystals form, warm to 72F for 24 hours.
Option II Do not store over 100F or below 10F.
Partner WDG Do not subject to freezing. Product can be stored under either heated or unheated conditions.
Peak Do not store under wet conditions.
Pentagon DG Do not store above 125F.
Permit Store under cool, dry conditions (below 120F). Do not store under moist conditions.
Poast and Poast Plus Do not store below 32F or above 100F.
Prefar Protect from temperatures below 42F. At temperatures below 42F, product may crystallize.
Princep Caliber 90 Store in a dry place.
Prowl 3.3EC Do not store below 40F. Extended storage at temperatures below 40F can result in the formation of crystals on the bottom of the container.
Pursuit 2AS and W Keep from freezing. Do not store below 32F.
Pursuit Plus Keep from freezing. Do not store below 40F.
Ramrod Flowable Store above 20F and below 100F to keep product in suspension.
Ranger At temperatures below 50F, the viscosity of this product may increase to a point that pouring and mixing could be difficult.
Raptor Keep from freezing. Do not store below 32F.
Reflex Store above 32F.
Remedy Store above 28F or agitate before use.
Rezult (B and G formulations) Do not allow this product to freeze.
Scepter O.T. Keep from freezing. Do not store below 32F.
Scorpion III Do not store above 122F for extended periods of time. Water soluble packets may become brittle when stored below 32F.
Shotgun Do not store below 0F.
Sonalan HFP Avoid freezing. Store above 40F.
Spirit Do not store under wet conditions.
Squadron Keep from freezing. Do not store below 40F.
Stalker Do not store below 10F.
Stam 4E and M-4 Protect from freezing. If stored below 32F and crystals form, warm to 72F for 24 hours.
Starfire Store at temperatures above 32F.
Status Store above 32F.
Steel Do not store below 40F.
Stinger Store above 28F or warm to 40F and agitate before use.
Storm Keep from freezing. Store above 32F.
Surpass 100 Can be stored at temperatures as low as -30F.
Surpass 20-G Can be stored at temperatures as low as -50F.
TopNotch Can be stored at temperatures as low as -30F.
Tordon 101 Mixture If exposed to subfreezing temperatures, the product should be warmed to at least 40F and mixed thoroughly before using.
Tornado Store above 32F. If product freezes, return to room temperature and agitate to reconstitute.
Treflan HFP Avoid freezing. Store above 40F.
Treflan TR-10 May be stored in unheated warehouses.
Tri-4 HF Avoid freezing. Store above 40F.
Tri-Scept Keep from freezing. Do not store below 40F.
Trifluralin (480, 4EC and HF formulations) Avoid freezing. Store above 40F.
Trilin Avoid freezing. Store above 40F.
Typhoon Store above 32F. If product freezes, return to room temperature and agitate to reconstitute.
Velpar L Do not subject to temperatures below 32F.
Whip 360 Do not store over 100F or below 10F.
Insecticides/Miticides/Nematicides: Storage temperature guidelines
Product Comments
Agree WG Store at temperatures below 104F.
Ambush 2EC Protect from freezing.
Ambush (wettable powder and water soluble pack) Do not store diluted material.
Ammo 2.5EC Do not store below 10F.
Ammo WSB Do not store at temperatures below 32F. Allow to warm above 50F before use.
Biobit XL Store in temperatures above 32F and below 90F.
Capture 2EC Do not freeze. Do not store below 40F. If crystals are observed, warm material to above 60F by placing container in warm location.
Chlorpyrifos 4E AG Do not store above 100F for extended periods. Storage below 20F may result in formation of crystals. If product crystallizes, store at 50 to 70F and agitate to redissolve crystals.
D-Z-N AG600 WBC If freezing occurs, place the product in a warm room (68 degrees Fahrenheit or above) and allow to thaw.
Decis 1.5EC Do not store over 100F or below 50F.
Declare Do not store below 0F.
Design Store at temperatures below 104F.
Dicofol 4E Keep from freezing. Store at 32 to 110F.
Dimethoate 400 Do not store below temperatures of 45F.
Dimethoate 4EC Do not store below 32F as it may tend to crystallize. Avoid storage above 90F, as prolonged storage above 90F may cause some loss in grade.
Dimethoate 5 LB. This product is susceptible to moisture. Do not store below 40F as product may crystallize. Avoid storage above 95F as prolonged storage above 90F may cause loss in grade.
Dimilin 25W and 2L Store in a dry location.
DiPel (ES and ES CPI) Do not store at temperatures greater than 100F.
Furadan 4F Furadan 4F is freeze/thaw stable. If frozen, thaw and agitate before reuse. To keep the product from freezing, store above 32F.
Fury 1.5EC Do not store below 20F. If solids are observed, warm to above 40F.
Gemstar LC Store at temperatures below 90F. Storing the product in a freezer or refrigerator will extend its shelf life.
Gnatrol Store between 59 and 86F.
Golden Leaf Tobacco Spray Do not store below 20F.
Guthion 2L Do not store below 45F.
Guthion Solupak 50 percent WP Do not store below 32F.
Javelin WG Protect from freezing. Storage at temperatures above 90F may impair effectiveness.
Karate Z Do not allow product to freeze.
Kelthane 50 WSP The water-soluble pouch may become brittle at storage temperatures below 32F but the miticide is not affected.
Kelthane MF Keep from freezing. Store at 32 to 110F.
KickStart Do not allow to freeze or become overheated.
Lannate LV Do not subject to temperatures below 32F.
Lannate SP Allow to warm above 50F for normal handling.
Larvin 3.2 Do not allow prolonged storage in areas where temperatures frequently exceed 115F.
Lorsban 4E Do not store above 100F for extended periods. Storage below 20F may result in formation of crystals. If product crystallizes, store at 50 to 70F and agitate to redissolve crystals.
Lorsban 50-W Bags may become brittle when stored below 32F. Do not store above 100F for extended periods of time.
Malathion 57 EC Do not store below 0F. If frozen, warm to 40F and redissolve.
Mustang 1.5 EW Do not freeze.
Neemix 0.25 and 4.5 Do not store below 50F or above 95F.
Nemacur 3 Do not store below 32F.
Novodor Storage at temperatures between 40 and 50F is recommended for maximum product stability. Storage at temperatures above 90F for an extended period of time should be avoided.
Phaser 3EC Do not store below 20F.
Pounce 3.2 EC Do not store below 10F.
Pounce WSB Do not store at temperatures below 32F. Allow to warm above 50F before use.
Provado Solupak Do not store below 32F.
Scout X-TRA Do not store over 100F or below 10F
Scout X-TRA Gel Do not store this product under wet conditions.
Sevin (all formulations) Do not store in areas where temperatures frequently exceed 100F.
Sniper 50 PVA Store below 120F. Do not store next to herbicides.
Spod-X LC Store at temperatures below 90F. Storing the product in a freezer or refrigerator will extend its shelf-life.
Temik (all formulations) Do not store in areas where temperature averages 115F or greater.
Thiodan 3 EC Do not store below 20F.
Thiodan Cottonseed Oil Do not store below 0F.
Thirethrin Do not store below 20F.
Thuricide Activity may be impaired by storage at temperatures above 90F.
Trigard Do not store this product under wet conditions.
Trilogy Do not store below 40F.
VectoBac 12AS Store between 59 and 86F.
Vydate C-LV and L Do not subject to temperatures below 32F.

 

G1921 Temperature Effects on Storage of Agricultural Pesticides | University of Missouri Extension

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