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  1. Agricultural IPM
  2. Field Crops
  3. Corn and Sorghum
  4. Diseases
Corn and Sorghum Diseases
Diseases

Grain sorghum grown in Arizona usually is not significantly damaged by diseases. Generally, fungicide applications are not economical for grain sorghum diseases. The most effective control measures are hybrid resistance and allowing at least 3 years between sorghum crops. Weed control can further limit disease introduction. Of the few diseases that have been described in Arizona, most have not been problematic in recent years. These include:

 

(1) Head smut, a fungal disease that infects the inflorescence and sometimes the foliage resulting in sooty vascular strands. In areas where disease occurs, only sorghum varieties with known tolerance should be planted.

 

(2) Maize dwarf mosaic virus (MDMV), an aphid transmitted virus that infects grain sorghum and Johnson grass. Johnsongrass is a common alternate host for the virus in Arizona.

 

(3) Fusarium root rot, also called Yuma root rot in Arizona, was reported in southwestern Arizona in 1972 in late planted sorghum. Several species of Fusarium cause root and stalk rots of sorghum and also are implicated in seedling and storage diseases, including mycotoxin production, but none has been a problem in Arizona to date. Tolerant varieties, earlier planting and good cultural practices have probably eliminated much of this problem.

 

(4) Root-knot nematode is probably the most common and easily missed pathogen on sorghum. Damage to sorghum is not always evident, but sorghum is an excellent host and causes problems when rotated with other susceptible crops such as corn, cotton, peppers and melons


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Disease Publications
  • Feb 2014
    Diagnosing Nutrient Deficiencies Quick-Reference
    Publication (PDF, 429KB)
    Authors: Shawna Loper
    Nutrient deficiencies can be identified in field through visual observations. However, additional analysis, either plant or soil testing is often necessary to confirm nutrient stress. The following is a quick-reference flow chart that can be used in field to identify potential nutrient deficiencies. Each nutrient has unique deficiency symptoms. Deficiencies will appear in many ways. It can be confused with other plant problems like pathogens or spray damage. But nutrient deficiencies can often be recognized because they tend to form symmetrical patterns, where both sides of leaf or plant parts show the same pattern.
  • Jun 2009
    Growing Grain Sorghum in Arizona
    Publication (PDF, 398KB)
    Grain sorghum (milo) is a warm season, annual grain crop. It is more resistant to salt, drought, and heat stress than most other crops. Nevertheless, highest yields are obtained when stresses are minimized. This Article give some suggestion on planting, fertilizing, irrigation and other aspects of growing.

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Disease Presentations

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ARIZONA PEST MANAGEMENT CENTER
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