Foliar sprays of NPK fertilizers induce systemic protection againstPuccinia sorghi andExserohilum turcicum and growth response in maize

Abstract

One spray of 0.1 M aqueous solutions of NPK fertilizers on the upper sides of maize leaves 1, 2, and 3, 2-4 h prior to inoculation, induced systemic resistance (ISR) against northern leaf blight (NLB) caused by Exserohitum turcicum and Puccinia sorghi which were developed on leaves 4, 5, 6, and 7. ISR was expressed as a reduction in the number and area of lesions of E. turcicum and in the number of sporulating or non-sporulating pustules of P. sorghi on leaves 4, 5, 6, and 7. The reduction in the number of NLB lesions ranged from 51% (KH2PO4) to 69% (K2HPO4) and their size reduction ranged from 73% (KNO3) to 91% (K2HPO4) as compared with water prayed plants. The reduction in the number of pustules of P. sorghi ranged from 66 to 77%. Fertilizers consisting of various combinations of N, P and K in every case induce similar levels of protection in either host-pathogen system. The induced protection was evident regardless of the leaf position or the rate of NPK accumulation in the upper protected leaves. High fresh weight was detected in the induced plants which expressed the greatest induced protection against NLB and common rust. The possible dual use of NPK fertilizers -to supply nutrients to plants foliarly and at the same time to activate the mechanism(s) for induction of systemic protection to P. sorghi and E. turcicum in maize -is discussed.

Potential for foliar phosphorus fertilisation of dryland cereal crops: a review

“…The most common adjuvant cited in research is Tween 20Ô (Clor et al 1962;Bouma 1969;Barel and Black 1979b;Syverud et al 1980;Reuveni et al 1996;Ahmed et al 2006). Generally this adjuvant is added to foliar fertilisers at a concentration of 0.1% v/v.…”

Indução De Resistência Sistêmica Para O Controle Da Vassoura-De-Bruxa Do Cacaueiro

“…Aplicação única de KCl na concentração de 0,1 M em folhas inferiores de pepino (Cucumis sativus) induziu resistência sistêmica nas folhas superiores contra Sphaeroteca fuliginea, por um período de 25 dias (Reuveni et al, 1994). Cloreto de potássio a 0,1 M também induziu RSA em plantas de milho (Zea mays) reduzindo em 80% a incidência de Puccinia sorghi, 10 dias após a inoculação (Reuveni et al,1996). Outro exemplo de indução de RSA com a aplicação de sais potássicos (K 2 HPO 4 a 50 mM) foi relatado por Irving & Kuae (1990) em plantas de pepino contra Colletotrichum lagenarium.…”

Phytoprotective film for resistance induction, growth, and yield of organic strawberries

“…powdery mildew on barley, cucumber, pepper, and tomato (Blumeria graminis f. sp. hordei, Sphaerotheca fuliginea, Leveillula taurica, and Erysiphe oronti, respec tively), anthracnose (Colletotrichum lagenarium) on cucumber, rust (Puccinia sorgi) and leaf blight (Exserohilum turcicum) on maize and rice blast (Pyricularia oryzae), mildew (Sphaerotheca fuliginea) (Reuveni et al, 1996;Reuveni and Reuveni, 1998;Manandhar et al, 1998;Reuveni et al, 2000;Ehret et al, 2002;Orober et al, 2002;Hamza et al, 2017).…”