Imidan should keep indefinitely if it remains dry. It looses affectiveness if too much rain falls after spray- 2" is a wash off number but if a spray is a week old 1" will do it. You also have to be sure spray water is mildly acidic- best somewhere in the high 5's. Alkaline water reduces its affectiveness considerably.

Thanks Harvestman. I wish though he would have put a definitive number in there. I'm sure they have that data. I guess the storage environment is such a big player in the lifespan they don't want to risk going out on a limb with disputable data. If I get a chance tomorrow I'll email micro-flo or Southern Ag and see what they have to say (if anything) about Captan.

The only way to know what that soil has for pH, P, K, Ca, and Mg is with a good reliable soil test. Along with that test you could also use these to get more information. 1) Soil test for organic matter. From that soil sample put enough of the rest to make a 4 inch level in a clear 1 quart jar, with a tight fitting lid. Fill that jar with water and replace the lid, tightly. Shake the jar vigorously and then let it stand for 24 hours. Your soil will settle out according to soil particle size and weight. For example, a good loam will have about 1-3/4 inch (about 45%) of sand on the bottom. about 1 inch (about 25%) of silt next, about 1 inch (25%) of clay above that, and about 1/4 inch (about 5%) of organic matter on the top. 2) Drainage. Dig a hole 1 foot square and 1 foot deep and fill that with water. After that water drains away refill the hole with more water and time how long it takes that to drain away. Anything less than 2 hours and your soil drainsâ too quickly and needs more organic matter to slow that drainage down. Anything over 6 hours and the soil drains too slowly and needs lots of organic matter to speed it up. 3) Tilth. Take a handful of your slightly damp soil and squeeze it tightly. When the pressure is released the soil should hold together in that clump, but when poked with a finger that clump should fall apart. 4) Smell. What does your soil smell like? A pleasant, rich earthy odor? Putrid, offensive, repugnant odor? The more organic matter in your soil the more active the soil bacteria will be and the nicer your soil will smell. 5) Life. How many earthworms per shovel full were there? 5 or more indicates a pretty healthy soil. Fewer than 5, according to the Natural Resources Conservation Service, indicates a soil that is not healthy.

Marineguy: Diesel fuel (#2 Fuel oil) and the genre (including the range of JPs) are "light oils" and as such do not break down or "destabilize" as quickly as Volatile Organic Compounds (VOC). The temperature of the storage vessel, whether the storage vessel has freedom of exchange with outside atmoshere (simple venting), or if the vessel has controlled head pressure (non vented) has much to do with the "shelf life" of these fuels. I would suppose that if the proper storage method were employed, light fuel oils could remain viable for decades on end. But then questions like, "Why store this stuff when we can just make some more?" might arise. As an active member of USMC (Thank you Sir!) you might be able to put out some "feelers" about long term storage of fuels as addressed by our U.S. military. I have heard that our military has (or did have) ships loaded with all types of gear, equipment and vehicles docked at Diego Garcia in "very long term storage" conditions. I don't know if fuel for the vehicles is/was stored as well. You might be able to find out something about "fuel storage" if you can throw some questions in that direction. Just a rambling series of thoughts.