Study of the Defence response in a cauliflower against Alternaria brassicae by using Biotic and Abiotic compounds
Bharat Bhooshan and Devesh Kumar
Department of Botany, R. B. S. College, Agra - 282002 {India} Dr. Bhimrao Ambedkar University, Agra - 282004 {India}
ABSTRACT
Alternaria blight of cauliflower initiated by Alternaria brassicae, is considered as one of the important diseases caused in cauliflower crop cultivated in all the growing areas of the world. Alternaria blight disease severity in cauliflower occurs after initiation of curd formation and continues till seed pods are set. Several opportunities include improvement of resistant cultivars; crop rotation, biological control, chemical pesticides, and tillage are used to control this particular disease. By using chemical pesticide mostly diseases can be controlled. In present investigation the three abiotic {Bion®: benzothiadiazole, salicylic acid, oxalic acid and two biotic compound T. viride and Trichoderma harzianum, lab formulations were used to control this disease. It was observed that the all the treatments were found to be effective in reducing disease and inhibiting pathogen growth in the form of conidial formation inhibition. However, the disease control were maximum in variety Doctor II and under post inoculation technique. The maximum disease control was observed with the treatment of bion {93.86%} followed by salicylic Aacid {90.93%} and oxalic acid {89.06%} @ 50 mg.L concentration. The biotic compound T . harziaznum {4g/Kg seeds} also showed effective disease control {87.2%} followed by T. viride {84.53%}. Although, the disease initiation in variety SV4051AC was two days later and the infection index was lower in Doctor II due to its tolerance nature.