Effect of nitrogen on the incidence of Verticillium wilt disease of egg plant caused by Verticillium dahliae Kleb

Abstract

An investigation on the effect of different levels of nitrogen on the incidence of Verticillium wilt disease of egg plant was carried out. Application of nitrogen to the host increases susceptibility to Verticillium wilt disease. The initial s y m p t o m s of disease appeared on the 6th day in plants fertilized with 200 kg and 400 kg N/ha following inoculation of plants with Verticillium dahliae, whereas the appearance of s y m p t o m s was delayed to a period of a further two days in the plants supplied with 100 kg N / h a and control plants which received no nitrogen. Besides the prolonged incubation period in symptom development due to low levels of nitrogen, the disease severity was also reduced with a reduction in application of nitrogen.

High Inputs of Nitrogen Fertilization and Short Irrigation Frequencies Forcefully Promote the Development of Verticillium Wilt of Olive

“…However, most studies have been conducted in herbaceous crops. Several authors have reported that low nitrogen (N) levels provoke a reduction of the susceptibility to Verticillium wilts in lucerne [11], hop [12], eggplant [13] or hop [14]. On the contrary, high nitrogen content in situations of potassium (K) deficiency may cause an increase in disease severity [9].…”

High Input of Nitrogen Fertilization and Short Irrigation Frequencies Forcefully Promote the Development of Verticillium Wilt of Olive

“…However, most studies have been conducted in herbaceous crops. Several authors have reported that low nitrogen (N) levels reduce susceptibility to Verticillium wilts in lucerne [11], hop [12,13] and eggplant [14]. In contrast, high nitrogen content combined with potassium (K) deficiency may cause an increase in disease severity [9].…”

Identifizierung und Charakterisierung extrazellulärer Proteine unter dem Einfluss von Verticillium longisporum in Arabidopsis thaliana und Raps (<i>Brassica napus</i>)

“…Ca 2+ akkumulieren und wegen einer geringeren Biomasse der Pflanzen eine höhere Konzentration erreichen. Wenn auch wenig über die Nährstoffsituation in Verticillium-infizierten Pflanzen bekannt ist, so wurde doch der Einfluss von Nährstoffmangel oder -überschuss im Boden oder Medium auf Verticillium induzierte Symptome vielfach untersucht (Ashworth et al, 1985;Burge & Simmons, 1982;Kudela & Pirkl, 1978;Sivaprakasam & Rajagopa, 1974;Walker et al, 1954). Durch Kalken des Bodens konnte die Resistenz in Medicago sativa gegen V. albo atrum erhöht werden (Kudela & Pirkl, 1978).…”

“…Bei Auberginen-bzw. Tomatenpflanzen führte die erhöhte Zugabe von Stickstoff, Kalium und Phosphor zu einer Verstärkung von Verticillium-induzierten Symptomen (Sivaprakasam & Rajagopa, 1974;Walker et al, 1954).…”