9 Replies Fungus is specific to sweet pea and survives in sweet pea refuse. Powdery mildew is the most common occurring plant fungal disease. Avoid overhead irrigation. 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. Lower leaves are first affected. 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. Should my sweet peas have these white spots on the leaves? The first year I got great healthy plants and even they succumbed. Sweet pea’s leaves are spiral, so they adjust to the direction easily, while you get beautiful flowers on top. Oak leaves Started by whistler on General Gardening. If plant leaves are turning white and dying, the underlying reason is most likely either sunscorch or powdery mildew. 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. Favored by wet conditions. Infected leaves often drop. 3 Replies 1677 Views November 07, 2010, 19:35 by whistler : sweet pea Started by chickpeacurry on General Gardening. There are white fuzzy spots growing on my peas. Large, irregular or circular tan spots without definite margins. Rotate with other crops for 2 years. What’s that on the leaves and pods? This further means that you can easily grow Sweet pea in your garden – it looks great, smells even better, blooms every year, and it is easy to grow and maintain – as this is a cultivated plant. 1 Replies 1103 Views February 23, 2014, 19:12 by mumofstig : Sweet Pea Started by puravida on General Gardening. Seed decay I'm attemping my first garden, and have a bunch of sweet peas starting to nicely climb up a trellis. I was looking at them today and noticed that a lot of the leaves had this white pattern on them. 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). Powdery Mildew strikes again!! This summer has unusually been particularly wet and cold and has given the sweet peas a lot of challenges.