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The host-specific characteristic of many leaf spot pathogens makes diversity in plant species a way to reduce and regulate leaf spot pathogen infection levels within plant populations. [ 18 ] Prevention of leaf spot disease includes variety selection, crop rotations, plant hygiene and fungicide use for seeds and foliage. [ 19 ]
Powdery mildew is one of the easier plant diseases to identify, as the signs of the causal pathogen are quite distinctive. Infected plants display white powdery spots on the leaves and stems. [1] This mycelial layer may quickly spread to cover all of the leaves.
This disease affects strawberry plant foliage causing purple spots ⅛ to ¼ inches across on the upper side of the leaves. [3] At first, the whole spot is purple but as the disease matures the center of the leaf spots on older leaves become tan or gray, then almost white. Lesions on younger leaves remain light brown. [4] When numerous spots ...
Fungal diseases; Anthracnose Sphaceloma menthae. Black stem rot Phoma strasseri. Leaf blight Cephalosporium sp. Phoma leaf spot Phoma exigua. Powdery mildew Erysiphe spp. Erysiphe cichoracearum. Ramularia leaf spot Ramularia menthicola. Rust Puccinia menthae Puccinia angustata. Septoria leaf spot Septoria menthae. Stem and stolon canker ...
Bacterial diseases; Common name: Scientific name: Plants affected: Bacterial leaf spot Erwinia carotovora subsp. carotovora: D, Ds Bacterial leaf spot E. chrysanthemi: D, Ds Bacterial leaf spot E. herbicola: Ds Bacterial leaf spot Pseudomonas sp. Ds Erwinia blight Erwinia carotovora subsp. carotovora: C, D, S Erwinia blight E. chrysanthemi: C, D, S
Bacterial diseases; Bacterial spot Xanthomonas campestris pv. vesicatoria: Bacterial wilt Ralstonia solnacearum: Bacterial canker Clavibacter michiganensis subsp. michiganensis: Syringae seedling blight and leaf spot Pseudomonas syringae. P. syringae pv. syringae. Crown Gall Agrobacterium tumefaciens
Most commonly Cephaleuros virescens is identified by the leaf spots it causes. Theses leaf spots are an orange-brown rust in color and usually occur entirely on the upper leaf surface, although leaf spots on the undersides of infected leaves have been reported. The spots are fuzzy in texture and approximately 2 cm (0.8 in) in diameter. [2]
Stemphylium solani is a plant pathogen fungus in the phylum Ascomycota. It is the causal pathogen for grey leaf spot in tomatoes and leaf blight in alliums and cotton, though a wide range of additional species can serve as hosts. Symptoms include white spots on leaves and stems that progress to sunken red or purple lesions and finally leaf ...