Integrated management of Alternaria leaf spot in cabbage caused by Alternaria brassicicola using chemicals and phyto extracts

Abstract

Cabbage (Brassica oleracea var. capitata L.) belongs to Brassicaceae family is main vegetable grown for its edible head. Cabbage is susceptible to different bacterial and fungal diseases among which Alternaria leaf spot caused by Alternaria brassicicola is potential extortion to successful production of cabbage. The aim of study was to manage the disease by using chemicals and plant extracts in in-vitro and in-vivo conditions. In lab experiment, five different fungicides (Nanok, Canbinax, Score, Revus and Defeater) and five different plant extracts (Neem, Aloevera, Moringa, Citrus and Pepper) at different concentrations with three replications of each treatment were evaluated. In field experiment, the in vitro best resulted fungicide and plant extract were applied both in separate and in combination on cabbage plants. The minimum fungal growth was expressed by Nanok (2.015 mm) and Neem (5.878 mm) under in vitro conditions and minimum disease incidence was showed by combination of Nanok + Neem (24.444%) under field conditions. The use of Nanok and Neem separately and in combination is recommended to farmers to overcome Alternaria leaf spot of cabbage.