Noun
TR4 (uncountable)
(pathology, botany, mycology, agronomy) Initialism of tropical race 4; the pathogenic fungus Fusarium oxysporum f.sp. cubense that causes Panama disease, which is 100% deadly to the Cavendish banana.
Cavendish is highly susceptible to TR4, and over time, Cavendish is almost certain to be eliminated from commercial production by this disease. Source: Internet
Tropical race 4 Tropical race 4 (TR4) is a reinvigorated strain of Panama disease first discovered in 1993. Source: Internet
The only known defense to TR4 is genetic resistance. Source: Internet