Abstract
Red root rot, caused by Phoma terrestris E. M. Hansen, caused premature senescence and yield reductions to fresh-market sweet corn in Hyde County, North Carolina in July 2006. Foliar symptoms developed over a period of 5 to 8 days approximately 1 to 2 weeks after anthesis and included desiccation of leaves and poor development of ears. By 3 weeks after pollination, when the sweet corn was harvested, crowns and the first aboveground internode of affected plants were rotted and reddish colored, but roots appeared normal. The root mass of affected plants tended to be greater than that of unaffected plants. Incidence of symptomatic plants was greater than 30% in some fields and was lower on crops planted and harvested early. Symptomatic and asymptomatic plants were adjacent in affected fields. Diseased plants were more common in fields of sweet corn that followed soybean (Glycine max) or a double-crop of onions (Allium cepa) than in fields that followed corn. Incidence of symptomatic plants also differed among adjacent plantings of different sweet corn hybrids. Hybrids '173A', '182A', '378a', and 'XTH1178' had a high incidence of symptomatic plants and '372A', '278A', '8101', and '8102' were less affected. Samples of symptomatic plants of the hybrid '182A' were examined at the North Carolina Plant Disease and Insect Clinic during August. Olivaceous black pycnidia with long setae around the ostioles were imbedded in the stalk near the first node aboveground. Numerous conidia (1.8 to 2.3 × 4.5 to 5.5 μm) were released in cirri from pycnidia. When cultured on potato dextrose agar (PDA), the fungus produced a red pigment and intercalary and terminal chlamydospores. Pathogenicity was demonstrated in the greenhouse by transplanting corn seedlings or direct-seeding corn into pots of soil infested with plates of PDA containing chlamydospores and hyphae. A suspension of chlamydospores and hyphae also was injected into the stems of plants 28 days after transplanting. Five replicates of the pathogenicity experiments were repeated twice with noninoculated controls. After 8 weeks, P. terrestris was recovered from the roots of all inoculated plants. Soil inoculation resulted in necrotic root tissue in approximately 25% of inoculated plants. Approximately 90% of inoculated plants had discolored crowns that resembled symptoms from field infected plants. Stem inoculations resulted in necrosis extending 2 to 5 cm from the point of injection and resulted in shoot death of 40% of inoculated plants that resulted in the development of an adventitious shoot. Red root rot was prevalent on field corn in the Delmarva Peninsula throughout the late 1980s and 1990s (1). To our knowledge, this is the first report of this disease causing damage to sweet corn in North Carolina. Foliar symptoms and discoloration of crowns of diseased sweet corn plants were similar to previously described symptoms of red root rot on field corn (2), however, roots of affected sweet corn plants were not substantially rotted and did not have a symptomatic reddish pink or dark carmine color, presumably because sweet corn is harvested prior to the development of root symptoms. References: (1) K. W. Campbell et al. Plant Dis. 75:1186, 1991. (2) D. G. White, ed. Compendium of Corn Diseases. The American Phytopathological Society, St Paul, MN, 1999.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Red root rot caused premature senescence and yield reductions in sweet corn.
- Taxon
- sweet corne0
- Interactor
- Phoma terrestris
_3-DLR-NW-jk.jpg?width=60)
Setophoma terrestrise0pathogen - Outcome
- premature senescence and yield reductionse0
- Setting
- Hyde County, North Carolinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_3-DLR-NW-jk.jpg?width=500)
Verbatim
e0“Red root rot, caused by Phoma terrestris E. M. Hansen, caused premature senescence and yield reductions to fresh-market sweet corn in Hyde County, North Carolina in July 2006”
Claim · model-written summary
Symptomatic plant incidence exceeded 30% in some fields.
Verbatim
e0“Incidence of symptomatic plants was greater than 30% in some fields”
t0“sweet corn”
Claim · model-written summary
Early planted and harvested crops had lower symptomatic incidence.
Verbatim
e0“Incidence of symptomatic plants was greater than 30% in some fields and was lower on crops planted and harvested early”
t0“sweet corn”
Claim · model-written summary
Diseased sweet corn was more common after soybean or onions than after corn.
Verbatim
e0“Diseased plants were more common in fields of sweet corn that followed soybean (Glycine max) or a double-crop of onions (Allium cepa) than in fields that followed corn”
Claim · model-written summary
Symptomatic incidence varied among adjacent sweet corn hybrid plantings.
Verbatim
e0“Incidence of symptomatic plants also differed among adjacent plantings of different sweet corn hybrids”
Claim · model-written summary
Soil inoculation caused necrotic roots in approximately 25% of plants.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- Soil inoculatione0
- Outcome
- necrotic root tissuee0
- Value
- 25%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil inoculation resulted in necrotic root tissue in approximately 25% of inoculated plants”
t0“Sweet Corn”
Claim · model-written summary
Inoculation produced discolored crowns in approximately 90% of plants.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- inoculatede0
- Outcome
- discolored crownse0
- Value
- 90%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Approximately 90% of inoculated plants had discolored crowns that resembled symptoms from field infected plants”
t0“Sweet Corn”
Claim · model-written summary
Stem inoculation caused necrosis extending 2 to 5 cm.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Stem inoculationse0
- Outcome
- necrosise0
- Value
- 2 to 5 cme0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stem inoculations resulted in necrosis extending 2 to 5 cm from the point of injection”
t0“Sweet Corn”
Claim · model-written summary
Stem inoculation caused shoot death in 40% of inoculated plants.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- inoculatede0
- Outcome
- shoot deathe0
- Value
- 40%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resulted in shoot death of 40% of inoculated plants”
t0“Sweet Corn”
The same questions in other papers
inoculation · survival · Zea mays (maize)Positive and negative results
2 in the opposite direction
- positive
- positive
inoculation · molecular: metabolites · Zea mays (maize)Positive and negative results
11 papers in the same direction as this paper · 117 in the opposite direction
- positive
- positive
- positive
125 papers more in this group
See all 129 papers →inoculation · disease · Zea mays (maize)Positive and negative results
66 papers in the same direction as this paper · 93 in the opposite direction
- positive
- positive
- positive
156 papers more in this group
See all 160 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.