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External stalk discoloration caused by anthracnose.
Internal stalk symptoms of anthracnose.
Left – Setae visible on the stalk surface using a hand lens; Right – Curved anthracnose spores as seen under a microscope.
Pink to reddish discoloration characteristic of Gibberella.
Stalk breakage at the node caused by Gibberella.
Disintegrated stalk pith caused by Fusarium.
External fusarium stalk rot symptoms.
Internal fusarium stalk rot symptoms.
Diplodia stalk rot.
Corn stalk showing Diplodia stalk rot symptoms. Note pycnidia on corn stalk node.
Broken corn stalks due to Diplodia stalk rot infection.
The very tiny black sclerotia on the vascular strands of the shredded pith are a characteristic sign of charcoal rot.
Charcoal rot begins as a root infection, which spreads into the lower stalk internodes and causes early ripening, shredding and breaking at the crown of corn.
Stalk breakage and dark lesions on lower nodes of plants affected by Physoderma stalk rot.
Stalk breakage and dark lesions on lower nodes of plants affected by Physoderma stalk rot.
The foregoing is provided for informational use only. Please contact your Pioneer sales professional for information and suggestions specific to your operation. Product performance is variable and depends on many factors such as moisture and heat stress, soil type, management practices and environmental stress as well as disease and pest pressures. Individual results may vary. Pioneer® brand products are provided subject to the terms and conditions of purchase which are part of the labeling and purchase documents.
Author: Mark Jeschke
Vol. 10 No. 23 Sept. 2018