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Garden Tips, Info and Pests

Tomato Early Blight and Septoria Leaf Spot

5/29/2019

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Two diseases that attack tomatoes early in the growing season around blossom set are Early Blight and Septoria.  Both start on lower leaves of the plant and result in leaf spots that may eventually kill the leaf. Defoliation of the plant is harmful and also leads to sunscalded fruit.  Disease development is favored by warm temperatures, abundant rainfall and high humidity.  We’ve had perfect conditions for both diseases, and I am seeing them on some of your tomatoes.  Mulching, caging, no overhead watering and good air flow are helpful to reduce disease pressures. To learn more about these early tomato diseases, here are articles from K-State Research and Extension, University of Minnesota, and Missouri Botanical Garden.

https://hnr.k-state.edu/extension/info-center/common-pest-problems/common-pest-problem-new/Early%20Blight%20of%20Tomatoes.pdf

https://extension.umn.edu/diseases/early-blight-tomato

​http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/diseases/fungal-spots/septoria-leaf-spot-of-tomato.aspx
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Early Blight
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Septoria Leaf Spot
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