Then and there we both realized that it is not a far-fetched idea for even small-scale gardeners to cover their tomatoes. This year at the Common Ground Country Fair, when Mark Hutton (vegetable specialist with UMaine Cooperative Extension) and I were doing our normal Q&A session, tomato problems dominated the discussion. The difference between my tunnel tomatoes and garden tomatoes is that the leaves of plants in the garden or field get wet, and moisture favors fungal growth, while leaves in the tunnel are relatively dry. I have lots of advice, but I warn folks that although they may be able to stave off the problem for a while, their plants likely will succumb. This decline is by far the most common problem about which people contact me. We grow only paste tomatoes outdoors in a garden, because most garden tomatoes (including mine) succumb to disease by late summer. This is OK with me, as most of my tomato plants are still doing fine – because most are in a high tunnel. Sadly, most tomato plants in gardens across Maine and the rest of the Northeast died before summer ended, as they do almost every year. It does not store any personal data.As you read this in December, you are probably already looking forward to next year’s tomatoes, but as I write this in mid-October, I am looking out my window at very dead tomato plants in my garden.
The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. In high humidity conditions, gray to white “fluff” will appear around the edges of darker lesions. Green fruits are more vulnerable to infection and could become marble-brown in appearance and the fruit becomes hard. Late blight symptoms include the spread of brown to black lesions on leaves surrounded by a thin halo of brighter pigmentations.
The entire potato and tomato fields be severely damaged within a few days or even destroyed within a matter of 2 weeks. Late blight is often misrepresented as a fungus however, it is an oomycete, a fungus-like organism similar to algae.Ĭool weather (15-25 C) and extended periods of high humidity, as a consequence of rain and fog, can result in a late blight epidemic. Late blight is documented in all members of the Solanoideae plant family, but potatoes and tomatoes have higher tendencies of getting infected. Late blight is a major threat to important crops around the world and is a driving force for new fungicide development. Late blight is responsible for the great 1847 Irish Famine and is perhaps the most notorious example for phytopathology.
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