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Leaf spots caused by fungi occur due to the necrosis of plant tissues. These necrotic lesions, localised in area and shape, consist of dead and collapsed cells of the host leaves. [ 1 ] One distinct feature of fungal infections is that there may be visible spores in the centre of leaf spots. [ 7 ]
Blight is a rapid and complete chlorosis, browning, then death of plant tissues such as leaves, branches, twigs, or floral organs. [1] Accordingly, many diseases that primarily exhibit this symptom are called blights. Several notable examples are: [citation needed]
At the base of the ribs of infected lettuce plants there is significant necrosis and lesions. The necrotic tissue can look brown to dark brown. The symptoms can be different depending on how bad the infection is and how far along the plant is in its growth. Extensive necrosis can cause damaged leaves to become dry and dead.
Pythium root rot and root tip necrosis Pythium spp. Rhizoctonia seedling rot Rhizoctonia solani (AG-4) Thanatephorus cucumeris [teleomorph] Rust Uromyces fabae. Sclerotinia rot = white mold Sclerotinia sclerotiorum. Septoria blotch Septoria pisi. Thielaviopsis root rot – black root rot Thielaviopsis basicola Chalara elegans [synanamorph] Wilt
The disease starts out as yellowing and drooping on one side of the plant. Leaf wilting, plant stunting, browning of the vascular system, leaf death and lack of fruit production also occur. [8] F. oxysporum f. sp. melonis attacks muskmelon and cantaloupe. It causes damping-off in seedlings and causes chlorosis, stunting and wilting in old plants.
Branch necrosis Dothiorella sp. Ceratocystis wilt Ceratocystis fimbriata Chalara sp. [anamorph] Charcoal fruit rot Macrophomina phaseolina. Charcoal root rot Macrophomina phaseolina. Crown rot Fusarium solani Nectria haematococca [teleomorph] Crusty leaf spot Zimmermanniella trispora. Curvularia blight Curvularia tuberculata. Dieback ...
Sclerotinia sclerotiorum is a plant pathogenic fungus and can cause a disease called white mold if conditions are conducive. S. sclerotiorum can also be known as cottony rot, watery soft rot, stem rot, drop, crown rot and blossom blight.
A heavily infected plant can succumb to the disease and die. As this occurs, the Verticillium will form its survival structures and when the plant dies, its survival structures will be where the plant falls, releasing inoculates into the environment. The survival structures will then wait for a host plant to grow nearby and will start the cycle ...