![]() The lesions may have a lighter colored halo or single ring encircling them.Īs the lesions grow, a white to gray mold will appear on the underside of the leaves. The spots will turn brown to dark olive green to black with a light green border on the underside. Tan to light brown, irregular shaped spots or lesions will develop, often near the tips of the leaves. The fungus attacks the plant through leaf stomata, so it is no surprise that symptoms first appear on the lower leaves. ![]() Regardless of the seasonal designations, late blight can occur anytime during the growing season when the weather is wet and cool. ![]() Phytophthora infestans is called late blight because it occurs later in the growing season, thus distinguishing it from early blight. While these are ideal conditions, the pathogen can produce spores in less-than-optimal conditions. Ideal conditions for infection and spread of this pathogen occur when there is high humidity, 90% or more, and temperatures are between 70☏ and 80☏ (21☌ and 26☌). It is the same pathogen that was responsible for the Irish potato famine that occurred in the 1840s. It primarily targets tomatoes and potatoes and, to a lesser extent, peppers and eggplant. Late blight is a fungal disease caused by the water mold Phytophthora infestans. Although the focus of this article is on tomatoes, the information can be applied to other members of the nightshade family, such as potatoes, peppers, and eggplant. ![]() In this article, you will learn how to identify, treat, and prevent late blight. The three types of blight that most often affect tomatoes are early blight, late blight, and Septoria leaf spot. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |