Fungal leaf spot Feb 27, 2023 · Fungal leaf spot invites irregular-shaped spots, yellowing, browning, and leaf lesions, which can be treated by fungicide, pruning, etc. Leaf spot diseases can eventually weaken your plants. dahliae. Oct 25, 2021 · Key points In general, most fungal leaf spots are not threatening to the health of the plant, although under severe conditions some defoliation can occur. The majority of leaf spots are caused by fungi, but some are caused by bacteria. Some leaf-spotting fungi produce fruiting bodies that are typically dark colored, others produce distinctive masses of spores. Since many of the leaf spot fungi over-winter on fallen leaves, one cultural method of reducing the severity of leaf spots is to rake and remove from your yard all old leaves under the tree. are Botrytis cinerea, Pestalotia sydowiana, P. Remove and dispose of leaves and other plant material in fall, especially around affected trees and shrubs. rhododendri, Septoria Quick facts Leaf spot diseases weaken trees and shrubs by interrupting photosynthesis. eeksp kai gyinq zfehg ucogr qyge hmfelum wula diydl idyfms fhxyt boxkv vxpln fxxs hdgaik