The efect of plant extracts and cultural practices on Cucumber Mosaic Virus Disease, and growth and yield attributes of Capsicum

Artículo

Cucumber mosaic virus (CMV) is nonpersistently transmitted by aphids, rendering chemical insecticides inefective. The efects of various plant extracts (neem leaf extract, garlic bulb extract, mahogany bark extract) and cultural practices (aluminium foil as refective mulch, coriander as intercrop, marigold as border crop) on CMV incidence and severity were evaluated in capsicum at Sher-eBangla Agricultural University, Bangladesh. Mosaic, shoestring, vein banding and stunted growth were observed visually in the feld and DAS-ELISA confrmed CMV infection in capsicum. Neem leaf extract resulted in the lowest CMV incidence (8.33 percent) and severity (21.67 percent), number of symptomatic leaves and the smallest percentage of leaf area reduction ( percentLAR) whereas the highest CMV incidence and severity, number of symptomatic leaves, and percentLAR were observed in the untreated  plots. However, the highest growth and yield parameters were recorded using aluminium foil as refective mulch. Maximum plant height and the highest number of asymptomatic leaves were observed in aluminium foil as refective mulch-treated plants. The highest fruit number per plant (13.33), heaviest fruits (62.10  g), highest fruit yield per plant (725.74  g), highest plot yield (2.78  kg), highest total yield (5.56 ton/ha) and lowest yield loss (17.68 percent) were observed in aluminium foil as refective mulch. Neem leaf extract efectively decreased the number of aphids per leaf. Total yield negatively correlated to CMV incidence and severity with 74.2 percent and 95.7 percent yield reduction respectively, indicating that efective management of CMV will lead to higher yield.