Leak is caused primarily by the fungus-like organism Pythium ultimum, which can cause severe crop loss in storage. Previous research has shown temperature as a major contributing factor to the incidence of leak in stored potatoes. The hypothesis that pulp and early storage temperatures affect cultivar susceptibility of leak has not been studied. The objective of this study was to determine the leak susceptibility of multiple russet-skinned potato cultivars and understand how leak susceptibility is affected by pulp and early storage temperatures. To accomplish the objective, Russet Norkotah selections (CO-3, TXNS-112, TXNS-278, TXNS-296, and Standard) were bruised and inoculated with a dilute spray solution of oospores of P. ultimum and stored at 21.1 C for four days to determine susceptibility between selections. To understand how pulp temperature affects cultivar susceptibility, pulp temperatures of Bannock Russet, Clearwater Russet, Russet Burbank, Ranger Russet, Teton Russet, and Umatilla Russet tubers were equilibrated to 12.8, 15.5, 18.3, and 21.1 C bruised, inoculated, and maintained at the same temperatures for four days. To address the effect of pulp and early storage temperature, cultivars Bannock Russet, Russet Norkotah CO-3, Russet Burbank, and Umatilla Russet tubers at tuber pulp temperatures of 15.5 or 21.1 C, were bruised, inoculated, and then held for 4 days at early storage temperatures of 12.8, 15.5, 18.3, and 21.1 C to simulate the ability to alter pulp temperatures with storage conditions. Selections of Russet Norkotah were similar in leak incidence; however Standard Russet Norkotah was significantly more susceptible. The impact of pulp temperature at bruising and inoculation showed all cultivars were significantly less susceptible to leak (19 to 63% incidence) at 12.8 C than at 21.1 C (72 to 93% incidence). When pulp temperatures were 15.5 or 21.1 C at bruising and inoculation and then exposed to early storage temperatures of 12.8, 15.5, 18.3, and 21.1 C, leak incidence was 11, 34, 59, and 74%, respectively; indicating the overriding impact that immediately cooling potatoes, opposed to initial tuber pulp temperatures, has on leak development. Cultivar susceptibility of leak was affected by temperature. Results highlight the importance of growing cultivars that are less susceptible to leak and to harvest susceptible cultivars when pulp temperatures are below 15.5 C or cool tubers below 15.5 C when adequate refrigeration or cooling air are available to rapidly modify temperatures in storage.

中文翻译：

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收获和早期贮藏温度对马铃薯品种对腐霉病的敏感性

泄漏主要是由真菌状的终极腐霉菌引起的，该菌可能导致储存中的严重农作物损失。先前的研究表明，温度是导致马铃薯贮藏泄漏发生的主要因素。纸浆和早期存储温度会影响品种对泄漏的敏感性的假设尚未得到研究。这项研究的目的是确定多个赤褐色表皮马铃薯品种的渗漏敏感性，并了解果肉和早期储存温度如何影响渗漏敏感性。为了实现这一目标，将Russet Norkotah选择品（CO-3，TXNS-112，TXNS-278，TXNS-296和Standard）擦伤并接种至终极疟原虫卵孢子稀释喷雾溶液中。并在21.1 C下保存四天，以确定两次选择之间的敏感性。为了了解纸浆温度如何影响品种敏感性，将Bannock赤set，Clearwater赤set，Russet Burbank，Ranger Russet，Teton Russet和Umatilla Russet块茎的制浆温度平衡至青紫，接种和维持在12.8、15.5、18.3和21.1C。在相同的温度下四天。为了解决纸浆和早期存储温度的影响，将青枯的Bannock Russet，Russet Norkotah CO-3，Russet Burbank和Umatilla Russet块茎在块茎纸浆温度为15.5或21.1 C的情况下进行挫伤，接种，然后在70℃下放置4天。早期存储温度为12.8、15.5、18.3和21.1 C，以模拟随存储条件改变纸浆温度的能力。Russet Norkotah的泄漏发生率相似。但是，标准的Russet Norkotah更容易受到感染。果肉温度对青紫和接种的影响表明，与21.1 C（72-93％的发生率）相比，所有品种在12.8 C时显着不易泄漏（发生19-63％的发生率）。当纸浆在擦伤和接种时的温度为15.5或21.1 C，然后暴露于早期存储温度12.8、15.5、18.3和21.1 C时，泄漏发生率分别为11％，34％，59％和74％。这表明立即冷却土豆（与块茎初始温度相反）对泄漏形成的主要影响。品种对泄漏的敏感性受温度影响。结果突出显示了当纸浆温度低于15.5 C或低温块茎低于15时，种植不易渗漏和收获易感品种的重要性。