I'm attemping my first garden, and have a bunch of sweet peas starting to nicely climb up a trellis. Its appearance, when first noticed, is characterized by spots or patches of white to grayish powdery growth on the upper surface of leaves and their stems. Sweet pea’s leaves are spiral, so they adjust to the direction easily, while you get beautiful flowers on top. Fungus is specific to sweet pea and survives in sweet pea refuse. This summer has unusually been particularly wet and cold and has given the sweet peas a lot of challenges. Powdery mildew is the most common occurring plant fungal disease. A fungicide may be necessary in some severe cases. for 3 years I have grown sweet peas from seed and every year by July/ August the plants have died off from this powdery mildew (I think that's what it is). 1 Replies 1103 Views February 23, 2014, 19:12 by mumofstig : Sweet Pea Started by puravida on General Gardening. I have not had any virus infection for several years now but the most common one that I have come across has been the yellow leaf one. Infected leaves often drop. Rotate with other crops for 2 years. Seed decay 3 Replies 1677 Views November 07, 2010, 19:35 by whistler : sweet pea Started by chickpeacurry on General Gardening. The most natural and healthy diet for humans is an omnivorous diet, and not a plant based diet, or a meat-based diet per se. Large, irregular or circular tan spots without definite margins. Should my sweet peas have these white spots on the leaves? Favored by wet conditions. 9 Replies What’s that on the leaves and pods? There are white fuzzy spots growing on my peas. Avoid overhead irrigation. The first year I got great healthy plants and even they succumbed. If plant leaves are turning white and dying, the underlying reason is most likely either sunscorch or powdery mildew. Oak leaves Started by whistler on General Gardening. 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