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Northern corn leaf blight. White blast Crown stalk rot Stripe Setosphaeria turcica. Exserohilum turcicum [anamorph] = Helminthosporium turcicum. Northern corn leaf spot. Helminthosporium ear rot (race 1) Cochliobolus carbonum. Bipolaris zeicola [anamorph] = Helminthosporium carbonum. Penicillium ear rot. Blue eye Blue mold Penicillium spp ...
One of the most effective ways of managing Cladosporium ear rot is to identify its presence as early as possible and to manage the environment that the corn is grown and stored in. Scouting fields for ear rots, which should be done every two weeks, [2] and testing for mycotoxin contamination is the first step in assessing whether or not ear ...
Diplodia stalk rot takes place mainly in the crown, mesocotyl, roots, and less frequently on the nodes between the crown and the ear. For both diseases, points of entry are facilitated by pest (e.g. bird, insect) damage, predisposing the host. Earworm (Helicoverpa zea) damage at the ear shank is often associated with the disease. [2] [4]
As the disease progresses, the lesions grow together and create large areas of dead leaf tissue. The lesions found in Northern corn leaf blight are more acute if the leaves above the ear are infected during or soon after flowering of the plant. [4] In susceptible corn hybrids, lesions are also found on the husk of ears or leaf sheaths.
The corn earworm feeds on every part of corn, including the kernels. [34] Severe feeding at the tip of kernels allows entry for diseases and mold growth. [34] Larvae begin feeding on the kernels once they have reached third instar. [34] Larvae penetrate 9 to 15 cm into the ear, with deeper penetration occurring as the kernels harden. [34]
The spores are a sign of the disease and are used for dispersal of the disease to other corn and sorghum plants. When the ear of the corn is infected, it looks very small and tear-drop shaped and seems as though it does not have a cob inside at all. [5] The cob is replaced by white sori which are the structures that make and hold the spores of ...
The damage from MDMV can cause the halting of ear formation and development, ultimately leading to the production of barren ears and direct yield loss. [5] There can be losses of up to 42% on early-planted field corn. [6] If corn is planted late MDMV can cause 75% or more loss on inbred and hybrid varieties.
Cochliobolus carbonum is one of the most aggressive members of this genus infecting sorghum (Sorghum spp. [Poaceae]), corn (Zea mays [Poaceae]) and apple (Malus domestica [Rosaceae]). [1] As one of the most devastating pathogens of sweet corn, C. carbonum causes Northern leaf spot and ear rot disease [ 1 ] while the asexual stage causes ...