Heatmaster helps extend the lettuce season into late spring or fall with its, fast-growing, heat and bolt tolerant growing habit. Light lime-green heads are medium to large and early maturing. Heatmaster prefers the warmer weather of spring or fall plantings. The plants are very uniform and show some resistance to Tip Burn.
|Bl||Downy mildew||Bremia lactucae|
|LMV||Lettuce mosaic||Lettuce mosaic potyvirus|
HR = High resistance: plant varieties that highly restrict the growth and development of the specified pest or pathogen under normal pest or pathogen pressure when compared to susceptible varieties. These plant varieties may, however, exhibit some symptoms or damage under heavy pathogen or pest pressure.
IR = Intermediate resistance: plant varieties that restrict the growth and development of the specified pest or pathogen, but may exhibit a greater range of symptoms or damage compared to “highly resistant” varieties. Intermediately resistant plant varieties will still show less severe symptoms or damage than susceptible plant varieties when grown under similar environmental conditions and/or pathogen or pest pressure.
T = Tolerance: The ability of a plant variety to endure abiotic stress without serious consequences for growth, appearance and yield.