Fungicidal effect of some non-conventional chemicals for management of alternaria blight disease of mustard

Abstract

Alternaria blight disease of mustard caused by a necrotrophic fungus Alternaria brassicae (Berk.) Sacc. is one of the most important limiting factors, causing yield losses of up to 47% in mustard (Brassica juncea). The aim of this present investigation was to evaluate the fungicidal effect of non-conventional chemicals viz. calcium sulphate (CaSO 4 ), potassium chloride (KCl), potassium sulphate (K 2 SO 4 ), zinc sulphate (ZnSO 4 ) and borax (Na 2 B 4 O 7 .10H 2 O) against alternaria blight disease of mustard. The significantly minimum size of spot was recorded in T 1 CaS at 0.5% (1.73) followed by T 3 CaS at 1.5% (1.75) and T 2 CaS at 1.0% (1.78) respectively in comparison to check. The minimum number of average leaf spots/25 mm 2 leaf area was observed in T 3 CaS at 1.5% (1.78) followed by T 1 CaS at 0.5% (2.26). T 1 CaS @ at 0.5% showed significantly lowest disease index (13.00%) followed by T 15 NaB at 0.75% (17.77%) and T 8 KS at 1.0% (18.00%) respectively over check. The average minimum apparent infection rate was recorded in T 1 CaS at 0.5% ( 0.504) followed by T 9 KS at 1.5% (0.553) and T 3 CaS at 1.5% (0.573) respectively. The AUDPC was significantly minimum in all the treatments of CaSO 4 i.e. in T 1 CaS at 0.5% (32.25), T 2 CaS at 1.0% (33.8) and T 3 CaS at 1.5% (35.55) in comparison to check (77.95). The foliar spray of CaSO 4 at 0.5% concentration induced resistance significantly against alternaria blight and reduce pesticide residue in food and environment.

In vitro and in vivo effect of eco-friendly chemicals on alternaria blight disease (Alternaria brassicae) and yield attributes in Indian mustard (Brassica juncea)

“…The present investigation supported the findings of Meena et al (2011) that showed that calcium sulphate, (Reddy, 2001;Agrios, 2005). The foliar application of CaSO 4 at 0.5% concentration induced resistance significantly against alternaria blight of mustard (Kumar et al, 2014). Tewari (1991) examined the black spot lesions on rapeseed leaves by scanning electron microscopy in conjugation with energy-dispersive X-ray microanalysis and revealed that the sequestration of calcium by A. brassicae.…”

“…In contrast to the largely structural, conformational, and osmotic roles of the macronutrients, the micronutrients act as catalysts, cofactors, and inhibitors (Graham, 1983). The eco-friendly approach to overcome biotic stress helped to optimize the economic yields and enable farmers to grow healthy Indian mustard crops (Meena et al, 2011;Meena et al, 2013;Kumar et al, 2014). The present study has been performed to obtain suitable information regarding disease management and precise estimates for yields due to different treatments in Indian mustard.…”

Impacts of Integrated Nutrient Management on Epidemiology, Seed Yield and Severity of Alternaria blight Disease in Indian Mustard (Brassica juncea L.)

“…(Sinha et al, 1992;Meena et al, 2011;Biswas, 2013;Kumar et al, 2013). The role of environmental factors in disease development as well as suitable chemical measures for disease control have been previously studied by many workers (Jagana et al, 2013;Kumar et al, 2014;Mahapatra and Das, 2016;Mahapatra et al, 2018).…”