But…if you’ve been gardening with me for awhile, you already do this!
Make sure you’re routinely adding plenty of organic matter to your soil which is teeming with ‘good’ fungi that can counteract the ‘bad’ fungi. On tomato fruit, late blight causes a firm, dark, greasy looking lesion from which the pathogen spore producing structures emerge under humid conditions. Symptoms on tomato leaves and stems are similar to those on potato.
#Home remedy for early blight on tomatoes how to
Spores can also be washed through the soil to infect potato tubers, which may rot before harvest, or later in storage.īecause the pathogen that causes late blight produces so many spores, and the spores can travel long distances through the air, it is very important that everyone who grows potatoes or tomatoes is able to identify late blight and know how to control it, to avoid being a source of spores that infect potatoes and tomatoes in neighboring gardens. Spores produced on infected potatoes and tomatoes can travel through the air, land on infected plants, and if the weather is consistently moist or wet, cause new infections. Temperatures consistently above 86 degrees have been shown to be unfavorable for late blight. Early in the season, the disease can be introduced into a garden on infected seed potatoes, from volunteer plants growing from diseased potatoes that were not harvested last season, compost piles, or infected tomato transplants brought into the area. All parts of the plant are affected including the fruit which can manifest as greasy, gray spots that spread quickly.
This organism is well known for its ability to produce millions of spores from infected plants under unseasonably cool wet weather conditions that favor the disease. It is caused by the fungal-like pathogen, Phytophthora infestans that survives from one season to the next in infected potato tubers and tomato transplants as well as dead potato and tomato vines. It is the same disease that lead to the Irish Potato Famine in the 1840s. This is a very destructive and very infectious disease that is significant in potatoes (not sweet potato) but also occurs in tomatoes.
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