Corn in Mississippi
Diseases
Since 1995, Mississippi producers have planted more acreage of corn than previous years. Corn is a very good rotational crop to control plant diseases (e.g. Reniform nematode (Rotylenchulus reniformis), Soybean cyst nematode (Heterodera glycines), Verticillium wilt, and Seedling disease) and it adds a high amount of crop residue (3 tons per acre) to the soil. This is a sound agronomic and economical practice that producers are adopting. However, corn is subject to many diseases and can reduce corn yield in Mississippi. The following diseases were occurred in several corn fields in Mississippi: Downy mildew (Sclerophthora macrospora) in 1996, Common rust (Puccinia sorghi) in 1997 and Aflatoxin (Aspergillus flavus) in 1998.
Frequently Asked Questions
What are the chemicals labeled for corn seed
treatment?
The table below shows chemicals labeled for corn seed treatment:
| Chemical |
Pathogen |
|||||
|---|---|---|---|---|---|---|
| Common name |
Trade name |
Percent a.i. |
Rate per 100 lbs. |
Fusarium |
Pythium |
Rhizoctonia |
Bacillus subtilis |
Epic |
2.75 |
0.25 - 1.0 oz. [field, sweet] |
|||
Bacillus subtilis |
Kodiak |
2.75 |
0.1 - 0.5 oz. [field, sweet] |
|||
captan |
Captan 300 |
28.70 |
1* fl.oz. [field] 3* fl.oz. [sweet] |
|||
captan |
Captan 30-DD |
28.70 |
1* fl.oz. [field] 3* fl.oz. [sweet] |
|||
captan |
Captan 400 |
37.40 |
1* - 2 fl.oz. [field] 2 - 4 fl.oz [sweet] |
|||
captan |
Captan 400D |
37.40 |
1* - 2 fl.oz. [field] 2 - 4 fl.oz [sweet] |
|||
captan |
Captan 75 |
71.70 |
1* oz. [field] 2 oz. [sweet] |
|||
carboxin |
Vitavax-34 |
34.00 |
2 - 4 oz. [field] |
|||
carboxin + thiram |
Vitaflo-280 |
14.90 + 13.20 |
8.5 - 11.5 fl.oz. [field] |
|||
metalaxyl |
Apron FL |
28.35 |
0.75 - 1.50 fl.oz. [field, pop, sweet] |
|||
metalaxyl |
Apron 25W |
25.00 |
1 - 2 oz. or 4 oz. [field, pop, sweet] |
|||
metalaxyl |
Apron 50W |
50.00 |
0.5 - 1 or 2 oz. [field, pop, sweet] |
|||
oxadixyl |
Anchor Flowable |
29.50 |
0.75 - 1.50 fl.oz. [field, pop, sweet] |
|||
quintozene (pcnb) |
RTU-PCNB |
24.00 |
3 fl.oz. [field] |
|||
thiram |
42-S Thiram |
42.00 |
3 fl.oz. [field], 5 fl.oz. [sweet] |
|||
thiram |
Thiram 50WP Dyed |
50.00 |
3.0 fl.oz. |
|||
What are the levels of Aflatoxin (Aspergillus
flavus) in Corn?
Presently, the Food and Drug Administration (FDA) will commence
enforcement actions if aflatoxin levels in corn exceed the following
limits: 20 ppb for human use, dairy feed, or feed for immature animals
100 ppb for breeding cattle, swine, or mature poultry 200 ppb for finishing
swine (i.e. more than 100 pounds body weight) 300 ppb for feedlot cattle.
What are the plant parasitic nematodes affecting
corn in Mississippi?
Root-knot nematode (Meloidogyne incognita) can cause an
economic damage to corn in sandy to sandy loam soils in Mississippi.
However, so far we have not seen any damage to corn by the root-knot
nematode in Mississippi. Other plant parasitic nematodes are not a problem
in Mississippi.
Does reniform nematode affect corn?
No. Corn is not a host of reniform (Rotylecnhulus reniformis)
nematode. Therefore, planting one year of corn to reniform nematode infested
soils will reduce the nematode population.