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Rust, common corn Puccinia sorghi: Rust, southern corn Puccinia polysora: Rust, tropical corn Physopella pallescens. Physopella zeae = Angiopsora zeae. Sclerotium ear rot Southern blight Athelia rolfsii: Seed rot-seedling blight Athelia rolfsii. Bipolaris sorokiniana Bipolaris zeicola = Helminthosporium carbonum Diplodia maydis Exserohilum ...
This ear of corn has been infected with Mycosarcoma maydis. The fungus infects all parts of the host plant by invading the ovaries of its host. The infection causes the corn kernels to swell up into tumor-like galls, wherein the tissues, texture, and developmental pattern are mushroom-like. The galls grow to 4 to 5 inches in diameter.
If infection of the shank occurs early enough the ear may be killed prematurely which causes the ear to drop. SCLB affected kernels will be covered in a felty, black mold, which may cause cob rot. [1] Ear rot is more extensive with Race T on T-cms corn. [8] Seedlings that become infected may wilt and die within a view weeks of the planting date ...
In most cases, the wilt phase occurs on seedlings, but for certain corn types (i.e. sweet corn), more mature plants can wilt. The wilt phase is systemic, meaning the majority of the plant is infected via bacterial movement and colonization of the plant's vascular system. When the bacterium spreads within the plant, leaves begin withering and ...
Temperature extremes can cause problems for both rescuers and victims. Stored grain is often kept fresh by blowing dry air over it. This, combined with any moisture in the grain, can chill its core to 30 to 40 °F (−1 to 4 °C). [b] creating a risk of hypothermia for the victim, especially one fully engulfed.
[2] [16] In sweet corn, reflective mulches can be an effective way to control D. maidis and the disease it vectors, compared to insecticides. [17] Mulching should be performed early in the plant's development to properly control this disease, as greater damage happens if the plant host is younger when infected with corn stunt disease.
Occasionally the infected areas have a reddish tinge. [3] Some authorities [3] make a distinction between "black point" and "smudge". For them the disease is "black point" from initial infection until more than half of the kernel is infected, or when the disease has entered into the seed's crease. [3]
The presence of Fusarium fungi on crop debris or seed can cause Fusarium seedling blight and foot and root rot. [1] Later, infection of the heads can occur with spores spreading by rain splash from infected crop residues. Another major infection route is airborne inoculum as spores can travel long distances with the wind. [4]