![]() ![]() Prevention is your best bet in the battle against all of these diseases, and in some cases you can nip them in the bud (or leaves, or fruit…). This water mold can also infect the fruit in cases of late blight, typically starting on the shoulders.Ĭheck out our in-depth guides to learn more about early blight, and Septoria leaf spot.They start out as little spots that look like they are soaked with water before spreading into large purple-brown blotches that appear oily. ![]() The lesions of late blight look different from those caused by fungi.Alternaria does not produce any comparable structures. Advanced Septoria leaf lesions contain dark colored fruiting bodies that look like grains of pepper.Septoria leaf lesions, on the other hand, usually present as numerous tiny brown spots that grow and spread.Alternaria produces lesions with concentric rings that can also affect the fruit.However, it is possible to tell them apart. And both of these infections start on the lower leaves. Read more about identifying late blight here.Įarly blight and Septoria are often confused, since each of these infections causes the leaves to yellow and die. Late blight is such a menace that you are advised to inform your county extension agent if you find it in your garden. Late blight.Īlternaria and Septoria can devastate your crop at home, while late blight is an extremely serious infection that can decimate whole tomato fields. This organism is what caused the Irish potato famine, forever altering Irish and American history. However, it is now known as a water mold (or oomycete, to be technical). The third – late blight ( Phytophthora infestans) – was considered a fungus for 200 years. Two are caused by fungi – early blight ( Alternaria solani) and Septoria blight, aka Septoria leaf spot ( Septoria lycopersici). However, they all have their quirks that allow you to distinguish between them. Spots on the leaves are the first indication of each of these infections. There are three types of blight that affect tomato plants. ![]()
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