<H1>Preemergence Herbicides</H1> <P><UL> <LI><H2>If irrigation is not available, apply well in advance of expected weed germination to allow for an activating rainfall. </H2> </UL><UL> <LI><H2>Loss of activity may occur if they are not watered in within 7 to 10 days. </H2> </UL><UL> <LI><H2>Treflan (Team) is the most volatile, Surflan the least volatile. </H2> </UL><UL> <LI><H2>Losses from photodecomposition and volatilization</H2> </UL></P> <P></P> <P>