Infected green fruit turn light brown to purple are soft, covered in a downy felt, and easily fall off the cluster; Berries are most susceptible when pea-size (early summer) and again when approaching maturity (late summer, early fall) More information on downy mildew of grape; 3 of 9. Anthracnose (Bird’s Eye Rot) Elsinoe ampelina. Many circumstances in a plant's environment can lead to browning leaves. The spores overwinter in diseased leaves on the ground and spread in spring through rain or irrigation water. I did not see it until I noticed the leaves drooping and falling off. Author Topic: Help please: Grape vine leaves turning dry and brown (Read 19084 times) OberonUK. Rusty brown spots on grape leaves could be an indication of several problems. CAUSE: Thrips are minute (less than 1/25 of an inch) insects that can be yellow, brown or black. As the disease evolves, the affected tissues turn brown, become united and the plant foliage is destroyed. It is important to note that not all herbicide damage may be the result of grower applications. Contact herbicides such as glufosinate or paraquat can produce brown necrotic spots on leaves, but generally do not result in vine death if the contact is limited. About the Author Mary7 Las Vegas, NV 10th May 2011 5:01pm #UserID: 5283 Posts: 2 View All Mary7's Edible Fruit Trees. Leaves of red-grape varieties turn red instead of yellow. To learn more, read Why Are My Plant's Leaves Turning Yellow and Falling Off? Iron deficiencies show up as a yellowing of young leaves and new growth. These holes have a grayish center with brown and black discoloration around them. Caused by the fungus Plasmopara viticola, downy mildew is a serious grape disease causing severe crop loss if untreated. Initial symptoms include tiny, yellow lesions and spots on leaves. This disease is favored by high temperatures and drought. Other Things That Trigger a Plant's Leaves to Turn Brown . To the naked eye, they look like tiny threads. SYMPTOMS: Silver or bronze colored streaks on leaves, which eventually turn brown, dry and crumbly. A lack of manganese appears as yellowing between the main veins of older leaves. The affected trunks will be completely dried out within few hours. One common problem is referred to as bird's eye rot and presents as small holes in the leaves. I am not too sure this is normal, but I will keep an eye on it a couple more days--and keep it away from my other plants. The area around the holes is raised and wrinkled, with a brittle texture and the edges of the leaves are similarly colored and dried out. The base leaves turn yellow (for the white grape species) or red (for the red species). Quarter Acre ; Posts: 81; Help please: Grape vine leaves turning dry and brown « on: May 26, 2010, 10:27:40 » It is my first year with a greenhouse and first attempt at growing grape vines. 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