Root rot is a common word that includes many types of fungus species that infect roots of plants that grows in wet soils.
The most common of those species are ( Phytophthora, Pythium, Verticillium, Rhizoctonia and others.)
It can easily cause plant to stop growth, wilting and death.
Chemical control
Elecanty ( Azoxystrobin 28.2% + Metalaxyl-M 10.8% SC )
500-650 Ml / Acre ( Soil irrigation)
Trexam ( Hymexazole 70% WP )
0.25 – 0.5 Grams/ Liter of water ( Soil irrigation)