Publication Date
1985
Location
Kyoto Japan
Description
In the early 1980s, a new stalk rot of corn occurred in Kanto, Japan. The diseased plants drooped first, then wilted within a few days. The disease appeared mostly on plants at the dent stage in late summer and fall. The stalks of the affected plants looked apparently healthy, but softened in some intern odes just above the ground. Longitudinal section of this portion showed a soft rot of inner tissues; pith was first water-soaked and abundant in oogonia and inflated mycelia, then turned brown and disintegrated, leaving the vascular strands intact. Prior to the stalk rot, severe root rot always occurred. Isolation and tooth pick inoculation proved that Pythium graminicola Subrm. was responsible for the disease. Fusarium monilioforme and Rhizoctonia soJani were also isolated frequently and most isolates of the latter were identified as AG-5. Their role was not studied. Sowing in and after mid-May favoured the disease, but sowing in April might enable the plants to escape from the disease. Tolerance to the disease differed much among the vatieties. Occurrence of the disease was little influenced by ill or well drainage of soil,fertilizer dosage or an amount of slurry applied. , The spread of whole crop silage might induce the prevalence of this disease, since the soilage crop corns escaped from the disease completely.
Citation
Sato, T; Shimanuki, T; and Tsukiboshi, T, "Preliminary Report on the Occurrence of the Root and Stalk Rot of Corn Caused by Pythium gramincola Subrm. in Japan" (1985). IGC Proceedings (1985-2023). 4.
(URL: https://uknowledge.uky.edu/igc/1985/ses7/4)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Preliminary Report on the Occurrence of the Root and Stalk Rot of Corn Caused by Pythium gramincola Subrm. in Japan
Kyoto Japan
In the early 1980s, a new stalk rot of corn occurred in Kanto, Japan. The diseased plants drooped first, then wilted within a few days. The disease appeared mostly on plants at the dent stage in late summer and fall. The stalks of the affected plants looked apparently healthy, but softened in some intern odes just above the ground. Longitudinal section of this portion showed a soft rot of inner tissues; pith was first water-soaked and abundant in oogonia and inflated mycelia, then turned brown and disintegrated, leaving the vascular strands intact. Prior to the stalk rot, severe root rot always occurred. Isolation and tooth pick inoculation proved that Pythium graminicola Subrm. was responsible for the disease. Fusarium monilioforme and Rhizoctonia soJani were also isolated frequently and most isolates of the latter were identified as AG-5. Their role was not studied. Sowing in and after mid-May favoured the disease, but sowing in April might enable the plants to escape from the disease. Tolerance to the disease differed much among the vatieties. Occurrence of the disease was little influenced by ill or well drainage of soil,fertilizer dosage or an amount of slurry applied. , The spread of whole crop silage might induce the prevalence of this disease, since the soilage crop corns escaped from the disease completely.
