About the blog

This blog is intended as means of keeping county agents and other interested parties informed about current diseases affecting horticultural crops in Louisiana and other issues related to plant pathology that may be of interest to them. The information presented is intended for educational purposes only, but comments and feedback are welcome. Opinions expressed by me or other sources do not necessarily reflect those of the LSU AgCenter.

The LSU Agricultural Center, as a state and federally funded institution of higher education, makes no warranty or representation of any kind, express or implied, including any warranty of fitness for ordinary purposes or particular purposes of any information, service or product represented in this website. Further, the USER ASSUMES THE RISK related to the use of any information, product or service represented in this website, including but not limited to any injury, damage, or economic loss resulting from the use or effect of any product, information or service presented herein. Information included on this website IS FOR EDUCATIONAL PURPOSES ONLY and whether such information is presented either directly or indirectly, whether by reference or hyperlink, does not reflect endorsement, validation or approval of the vendor, product, information or service. Comments are moderated and those found offensive and/or inappropriate will be excluded.

2 Responses to About the blog

  1. Phil says:

    Hi there Don, I’m a New Orleans resident who is attempting to grow a potted tomato plant on my front porch. For the second year, a newly potted tomato plant has contracted some organism that results in a diffuse, swirly lined pattern that infects all the leaves of a stem, and eventually results in a crippled and diseased appearance of that stem. This organism usually starts on the distal parts of leaves, spreading rapidly throughout the entire leaf over a period of days. New stems/leaves generally don’t get infected until they have a chance to mature. I also have a potted yellow pepper plant sitting right next to the plant, but it appears much more resistant, having only contracted the organism on one leave with containment to just that leaf. I don’t know if this is something you could help me with, but I could send you pictures if you’d like – it is really odd looking. I’m guessing it must be a local mold/fungus that readily distributes spores in the air. Thanks for the blog! Best, Phil

    • Don Ferrin says:


      This sounds like you have a problem with an insect called a leaf miner, which is a tiny fly that lays it’s egg in the leaf. After the larva hatches, it “tunnels” through the leaf as it feeds causing the swirling line pattern that you described. You might try spraying with an insecticide containing the active ingredient ‘spinosad’, but it’s more effective against the adults than the larvae within the leaf. This material is available in most home garden centers and can be used in organic vegetable production. For a photo of leaf miner damamge on tomato, see http://en.wikipedia.org/wiki/File:Leaf-miner-tomato.jpg.

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