My first thought is to agree with Fruitnut. Looks like herbicide damage from a phenoxy herbicide--2,4-D, MCP, and Dicamba are probably the most commonly used and one of these is probably in weed and feed. These herbicides can release vapors which will affect the foliage on sensitive plants even if you didn't contact them directly, and quite often light damage will show up in new growth while existing growth at the time of application will show little sign of damage. Glyphosate can also result in mis-shapen growth and chlorosis on new growth after minor exposure. When applying herbicides to your lawn, do it when there is a very light breeze(not wind) that is expected to continue until the herbicide has been neutralized or washed into the ground for breakdown by the soil. If it is dead calm, vapors or mist can form and stay in your yard. A light breeze will dilute this with fresh air so it is non damaging. Some trees are just extremely sensitive to these herbicides and need to be given a wide berth when applying and don't leave the empty application equipment near the tree, either--for sensitive trees, if you can smell it, so can the tree.

Here's your pic linked. Yep, an oak, in the red oak group. Probably caterpillars of some sort, and by now they will likely have finished eating and pupated. Resin Here is a link that might be useful: Photos

Hi zetterberg, The curling upward & chlorosis on older leaves looks like magnesium (Mg) deficiency symptoms. It is not fatal. I am guessing that you have been using a good deal of calcium (Ca) in your fertilizer, since we are always paranoid about BER. Also, when a container medium is "limed" to adjust pH, this technique can introduce several Ca variables. (Not subject of this post.) There is a problem associated with Ca, which is usually a booster of mineral uptake - but not Mg. Mg uptake is less with excessive Ca present (one reason why symptoms take time to show up = it takes time for Ca to build up). Since Ca is not a fast moving element it is possible that in a SWC it is accumulating in the root zone, from wicking into the growing medium. This Ca can the alter the root's membrane surface & bind to reactive sites in a way that affects permeation of Mg. (But the same Ca behavioral properties encourages many other ions, like crucial potassium or K, uptake.) So, please review your level of Ca use, to see if you are using too much of a good thing. In a SWC the fertilization technique (ie: wicks up depending on growing medium used) may be hard to alter, but the fertilizer ingredients can be adjusted. Flushing of the growing medium would be possible to do; but quite inconvenient an extreme if leaf Mg deficiency symptoms are not becoming rampant. An effort to foliar feed Mg may or may not be effective, opinions on the technique vary. Foliar feeding excessive Mg that is allowed to drip down into the growing medium may or may not (TDS problems) be desirable. Poster named structure indicates his top watered container tomatoes do not have these symptoms, but tomatoes in his SWC do. To me this indicates his top watering precludes the Ca from accumulating in the tomato root zone & so no Ca antagonistic affect occurred with Mg; unlike symptoms seen in his SWC tomatoes. Dirt growers have an open eco-system so tomato crops are less prone to this Ca/Mg inter-action problem. For those with high Ca content in their irrigation well water &/or calcerous (many island land is upthrust coral) soils the symptoms of Mg deficiency are possible.

"I planted a 5 gallon trashcan next to this plant and two others, buried 1/3 of the can, with holes drilled in bottom, to provide slow subsurface irrigation. I feed 1x per week with compost and heirloom tomato fertilizer added to the irrigation can." In addition to all the other points made about lack of any nutrients and water, I will add that set-ups such as you describe are very prone to plugging up the holes and restricting water. Plus compost left to stand in such an environments can easily turn anaerobic. Such an approach isn't nearly as ideal as it may sound. Dave