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Message: <blockquote data-quote="guywhofishes" data-source="post: 158233" data-attributes="member: 337">We got some free topsoil that was generated by the city's composting of leaves and lawn cuttings. What we didn't know at the time was that many of today's herbicides are so durable that after they're sprayed on lawns and end up in cuttings they outlast the composting process. They're not just your grampa's 24D that's harmless a week later anymore.Our tomatoes were subsequently effed and in a way that sounds familiar to yours. Had to remove it and start over. Still pisses me off the city doesn't have a big sign alerting people to the sinister soil they're getting "for free".- - - Updated - - -Also - some weed control chemicals literally generate "fumes" that can drift and kill. If you're spraying anywhere remotely near live tomatoes - stay a country mile away.Two actually. ;:;rofl- - - Updated - - -DriftDrift occurs during the herbicide application. It is the unintentional, off-target application of herbicides. This can lead to damage of surrounding crops as well as an ineffective herbicide application.There are several factors that can lead to herbicide drift, including:<ul> <li data-xf-list-type="ul">Severe Temperatures: Ideal temperatures for herbicide-use range from 65 degrees F to 85 degrees F.</li> <li data-xf-list-type="ul">High Wind Speeds: Herbicide labels specify optimal wind conditions for application. If a grower goes off-label, their risk of drift increases.</li> <li data-xf-list-type="ul">Small Droplet Size: Smaller droplets are more likely to be carried away by the wind than larger droplets. Herbicide labels will also specify optimal droplet size to decrease drift.</li> </ul>Herbicides are most effective when applied in high humidity and with wind speeds of about 10 mph or less. Ensure that the application nozzles are on the correct setting to produce optimal droplet size to minimize drift. The position and height of the boom are also listed on the herbicide label. With the boom being closer to the crops, the distance the droplets can travel is reduced.VolatilizationVolatilization is the movement of herbicide vapors through the air following an herbicide application. Similar to evaporation, volatilization occurs when the herbicide residue changes from a solid or liquid to a gas or vapor. Once vaporized, the vapors can be carried long distances by the wind, possibly damaging surrounding crops as well as causing an ineffective herbicide application.The risk of volatilization increases when:<ul> <li data-xf-list-type="ul">Herbicides are applied to inert, non-absorbent surfaces like rocks or pavement,</li> <li data-xf-list-type="ul">Temperatures are high,</li> <li data-xf-list-type="ul">Humidity is severe and</li> <li data-xf-list-type="ul">Herbicide formulations are potentially volatile.</li> </ul></blockquote>

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