Leaf constituents of Curcuma spp. suppress Meloidogyne hapla and increase bacterial-feeding nematodes

Abstract

Bioactive compounds extracted from agronomical plants have the potential to be ecologically safe and efficient alternatives to restricted broad-spectrum nematicides for managing root pests like Meloidogyne hapla. This study determined the effects of Curcuma longa and C. mangga leaf extracts and constituents on M. hapla infection, beneficial nematodes found in soil, and plant growth under glasshouse conditions over 350-420 degree-days (base 10°C). Incorporation of 60 and 120 g fresh leaves (kg soil) −1 of both Curcuma spp. suppressed the numbers of M. hapla infecting roots of tomato cv. Rutgers but increased beneficial nematodes in soil with minimal negative effect on plant health and growth. Curcuma mangga appears to be more favourable to beneficial nematodes than C. longa. Rhabditis, Acrobeloides and Eucephalobus were the dominant beneficial nematodes isolated from soils amended with Curcuma spp. The safe and selective activities of Curcuma spp. suggest potential for developing biologically integrated M. hapla management strategies.

Bazı baharat ekstraktlarının Meloidogyne arenaria (Neal, 1889) Chitwood, 1949 (Tylenchida: Meloidogynidae)’ya karşı nematisidal potansiyellerinin araştırılması

“…Constituents of turmeric have been shown to be effective, in both in vitro and in vivo studies, against also various plant pathogens. According to Nair et al (2015), turmeric suppressed the number of M. hapla in the roots of tomato cv. Rutgers while increasing the number of beneficial nematodes in the soil with minimal negative effects on plant health and growth, and the components of turmeric leaf macerates and extracts suppressed the ability of M. hapla to infect plant hosts without affecting plant growth.…”

Evaluation of Biocontrol Agents and Organic Amendments for the Management of Root Knot Nematode and Spiral Nematode in Banana

“…Amending soil with fresh or decomposed organic matter alters the physical, chemical and biological properties of the soil. These changes are responsible for lowering nematode density (Nair et al, 2015). Decomposition of organic matter like stable dung, green manure, compost and other organic material in soil was responsible for the reduction in nematode infestation in cultivated crops (Seenivasan, 2010).…”

Status of Root-Knot Nematode, Meloidogyne hapla Infection on Carrot at Kodaikanal Hills of Tamil Nadu, India and Its Yield Loss Estimation

“…It leads to formation of galls, digitation and constriction on taproots (Devrajan et al, 2004). In addition, it causes seedling death, stunting of young plants, branching of taproots which reduces quality and yield (Devrajan et al, 2003;Seenivasan and Devrajan, 2007 (Nair et al, 2015;Seenivasan, 2017b). However, there is no systematic information on the incidence of M. hapla and their yield loss potential in Kodaikanal regions.…”