Rust usually starts out as yellow or whitish spots on the top sides of the leaves. Potato scab is caused by a bacterium-like organism, Streptomyces scabies, that overwinters in soil and fallen leaves. Female potato bugs lay orange-yellow eggs in clusters on the underside of the leaves on the host plants. brown spots on runner bean leaves Any idea what this could be? One of the first signs of blight affects the leaves; you will notice brown freckling or lesions on the leaves of the potato plant. I cut them off and threw them away, I didnt' want it to spread. These areas contain masses of dusty brown spores; Severe attacks of powdery scab can lead to massive distortion of tubers, reminiscent of wart disease caused by Synchytrium endobioticum, a serious but now very rare potato disease. Stop treating a few weeks before harvest. The leaves will exhibit dark brown water-soaked spots; later the spots become blackish and later affected tissue drops leaving a hole in the leaves; black raised specks may appear on the tubers. The distinctive bright reddish or yellowish spores that give the plant its name appear later, as pustules on the undersides of the leaves. Small brown raised spots or larger patches on the leaves indicate a fungal problem. Starting in May, spray once every two weeks. Under moist conditions, a white fungal growth can appear under the foliage. They may develop larger patches of brown with a yellowish border spreading from them. I would like to stay organic, or at least free of harsh chemicals--I like to just hose the dust off and eat my plants :) However, I'd rather have plants than not. The leaves commonly turn yellow, the plant grows slowly and becomes stunted, and in severe cases it eventually dies. Downloads Use of SDHI Fungicides for Managing Early Blight and White Mold (presented at the 2019 Idaho Potato Conference) A related disease called brown leaf spot (caused by Alternaria alternata) can also be problematic on potatoes, but this is not as aggressive as early blight. I was checking out my potato plants yesterday, and the tops of the plants were turning brown and looked kind of shriveled. It's been in the 90's for a while now. 6 Replies 2063 Views August 11, 2007, 00:25 by WG. 0 Replies 1312 Views July 28, 2009, 17:52 by SnooziSuzi : Peas - brown spots on the leaves Started by Ann on Grow Your Own. Hi everyone, My potatoes have just started to show signs of Brown Leaf Spot. Then, those little larvae start to feed on the foliage for the next month. Powdery scab: Irregular brown raised areas or depressions, often with papery margins, on the surface of tubers. I also thought it might just be the heat, i am in houston. 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