Internal browning of potatoes as affected by date of planting and storage

Relationship of Internal Heat Necrosis of Potato to Time and Temperature after Planting

“…Benoit et al (1986) found that plant growth was a function of the combined influence of maximum and minimum temperatures and that each daytime maximum had an optimum night temperature. The variables appearing in the regression models for incidence, rating, and distribution suggest that the development of IHN is not necessarily a simple response to high temperatures as previously suggested (Ellison and Jacob, 1952;Hooker, 1981;Larson and Albert, 1945), but rather a combination of responses to several environmental stimuli. Although a variable representing rainfall and irrigation was included, it was not selected in the stepwise regression analysis using maximum R 2 improvement.…”

“…These regression models show the complex relationship of time and environmental factors on the development of IHN. Differences in observed necrosis over a period of years have been reported in several other studies, suggesting that one or more seasonal or environmental triggers may be associated with the development of IHN (Ellison and Jacob, 1952;Friedman, 1955;Larson and Albert, 1949;Wolcott and Ellis, 1959). Nelson et al (1979) also found a complex plant and environmental interaction associated with the development of hollow heart, another disorder of potatoes.…”

“…However, the time elapsed from first trace to offgrade was 5 days longer for NJ86L. Both Ellison and Jacob (1952) and Iritani et al (1984) reported reduced IBS with later plantings, although the former noted more IBS in tubers harvested 4 weeks after maturity than in those harvested soon after the vine died. The difference between the progression of IHN in 'Atlantic' in these studies and in studies using 'Katahdin' or 'Russet Burbank' maybe due in part to cultivar differences or to the stage of progression at the time of harvest.…”

“…Hiller, personal communication). Necrotic tissue in potato tubers has also been described as internal rust spot (Davies and Talbot, 1989), internal browning (Ellison and Jacob, 1952;Wolcott and Ellis, 1959), physiological internal necrosis Albert, 1945, 1949), internal brown fleck (Novak et al, 1986), and chocolate spot (Kamal and Marroush, 1971).…”

“…Differences in cultivar susceptibility have been reported in several growing areas, with yearly variation in incidence and severity (Ellison, 1953;Ellison and Jacob, 1952;Larson and Albert, 1949;Wolcott and Ellis, 1959). Increased incidence of necrosis has been associated with growing seasons having above normal temperatures (Ellison and Jacob, 1952;Larson and Albert, 1945;Wolcott and Ellis, 1959), and below normal precipitation (Ellison and Jacob, 1952;Larson and Albert, 1945). However, the influence of environmental factors on the incidence and severity of IHN has not been quantified.…”