WebThe bacterial and fungal leaf spot diseases Rhizoctonia and Cercospora are common culprits in developing brown spots on gardenia leaves. Cut off diseased branches, … WebApr 12, 2024 · 2. Apple scab. Apple scab is a common fungal disease that affects apple trees and other related species. It is caused by the fungus Venturia inaequalis, which overwinters in fallen leaves and produces airborne spores during wet spring weather.The infection can cause spots on infected plants’ leaves, fruit, and twigs. Apple varieties …
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Web1. Aphids. SYMPTOMS: Leaves develop yellow spots, then wilt. Black mold growing on top of leaves. CAUSE: Aphids are tiny pests that can be red, green, black, brown or white. They cluster on the underside of leaves … WebIrregular brown spots on the leaves—sometimes with yellow edges. This disease usually affects mature leaves. You may see small, brown spots at first. These brown spots can grow into irregular shapes with a yellow … gold nanoparticles for cancer therapy
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WebDepending upon the pathogen, leaf spots may occur on the upper, lower or both surfaces of the leaves. Leaf spots may be angular or rounded, raised or sunken, and have smooth … WebFeb 28, 2024 · Problems with heat and poor air circulation. If you notice brown spots on your weed leaves, it could be a sign of a problem with the heat or air circulation in your grow room. If the temperature is too hot, the … WebFungal Leaf Spots: Several fungi can cause leaf spots. Symptoms include small, brown spots with yellowish margins on the leaves. Spots may have a concentric ring or target pattern. Small black dots (fruiting bodies of the fungi) may be visible in dead tissue. Sometimes the lesions run together, and the entire leaf dies. headley tennis club