Journal Article

Nematicidal activity of a biopolymer chitosan at different molecular weights against root-knot nematode, Meloidogyne incognita

Khalil, M.S., Agricultural Research Center, Alexandria (Egypt). Central Agricultural Pesticides Lab, Badawy, M.E.I., Alexandria Univ. (Egypt). Dept. of Pesticide Chemistry and Technology

2012

Overview

The nematicidal activity of four molecular weights (2.27 x 10**5, 3.60 x 10**5, 5.97 x 10**5, and 9.47 x 10**5 g/mol) of a biopolymer chitosan was assayed against the root-knot nematode, Meloidogyne incognita, in vitro and in pot experiments. In laboratory assays, the nematode mortality was significantly influenced by exposure times and chitosan molecular weight. Low molecular weight chitosan (2.27 x 10**5 g/mol) was the most effective in killing the nematode with EC50 of 283.47 and 124.90 mg/L after 24 and 48 h of treatment, respectively. In a greenhouse bioassay, all the compounds mixed in soil at one- and five-fold concentrations of the LC50 value significantly reduced population, egg mass, and root galling of tomato seedlings compared with the untreated control. In general, the nematicidal activity of these compounds was increased dramatically with a decrease in the molecular weight. The results suggest that the chitosan at low molecular weight may serve as a natural nematicide.

• Publisher: Czech Academy of Agricultural Sciences (CAAS),Czech Academy of Agricultural Sciences
• Subject: Bioassays / BIOPOLIMEROS / BIOPOLYMERE / BIOPOLYMERS / BROTES / CHITOSAN / CHITOSANE / CONTROL DE NEMATODOS / DIMINUTION DE LA POPULATION / DISMINUCION DE LA POBLACION / EFFICACITE / EFFICIENCY / EFICACIA / egg masses / EXPERIMENTACION EN CONTENEDOR / EXPERIMENTACION IN VITRO / EXPERIMENTATION EN POT / EXPERIMENTATION IN VITRO / Galling / greenhouses / http://www.fao.org/aos/agrovoc#c_13512 / http://www.fao.org/aos/agrovoc#c_14261 / http://www.fao.org/aos/agrovoc#c_15219 / http://www.fao.org/aos/agrovoc#c_16131 / http://www.fao.org/aos/agrovoc#c_2491 / http://www.fao.org/aos/agrovoc#c_27468 / http://www.fao.org/aos/agrovoc#c_28288 / http://www.fao.org/aos/agrovoc#c_31072 / http://www.fao.org/aos/agrovoc#c_31447 / http://www.fao.org/aos/agrovoc#c_32520 / http://www.fao.org/aos/agrovoc#c_4260 / http://www.fao.org/aos/agrovoc#c_4475 / http://www.fao.org/aos/agrovoc#c_4892 / http://www.fao.org/aos/agrovoc#c_4945 / http://www.fao.org/aos/agrovoc#c_5109 / http://www.fao.org/aos/agrovoc#c_5110 / http://www.fao.org/aos/agrovoc#c_5454 / http://www.fao.org/aos/agrovoc#c_5972 / http://www.fao.org/aos/agrovoc#c_6651 / http://www.fao.org/aos/agrovoc#c_6945 / http://www.fao.org/aos/agrovoc#c_7805 / http://www.fao.org/aos/agrovoc#c_8349 / in vitro and plot experiment / IN VITRO EXPERIMENTATION / LARGURA / LENGTH / LONGUEUR / Low molecular weights / LUTTE ANTINEMATODE / LYCOPERSICON ESCULENTUM / MELOIDOGYNE INCOGNITA / mematode mortality / MOLECULAR WEIGHT / MORTALIDAD / MORTALITE / MORTALITY / natural nematicide / nematicidal properties / NEMATICIDES / NEMATOCIDAS / NEMATOCIDE / NEMATODE CONTROL / NEMATODE DES PLANTES / Nematodes / NEMATODOS DE LAS PLANTAS / OVA / OVULE / OVULO / OXAMILO / OXAMYL / PESO / PESO MOLECULAR / PLANT NEMATODES / plant protection / PLANTULAS / PLANTULE / POIDS / POIDS MOLECULAIRE / POPULATION DECREASE / POT EXPERIMENTATION / POUSSE / QUITOSANO / RACINE / RAICES / root-knot nematodes / ROOTS / SEEDLINGS / SHOOTS / soil / TOMATE / TOMATOES / VISCOSIDAD / VISCOSITE / VISCOSITY / WEIGHT