Effects of Soil Water Level, Black Dot (Colletotrichum coccodes) Infested Soil and Nutrient Depletion on Potato in a Controlled Environment

Effect of Extended Crop Rotations on Incidence of Black Dot, Silver Scurf, and Verticillium Wilt of Potato

“…In recent experiments, significantly more disease oc curred on plants stressed from an imbalance of either nitrogen or potassium than when optimum levels of each nutrient were availa ble to plants (4,18). Severity of black dot was also greater when plants were stressed by excessive irrigation water than when plants were optimally watered (10). Not only does water-saturated soil favor spread and development of C. coccodes, but oxygen is dis placed in the soil, which is needed by roots for oxidative respira tion.…”