Abamectin is a mixture of macrocyclic lactones produced by the actinomycete Streptomyces avermitilis especially known for its insecticidal and acaricidal activities. The effectiveness of an abamectin formulation (Vertimec® EC) for the control of the widespread and polyphagous root-knot nematode Meloidogyne incognita was investigated in a pot experiment on tomato (cv. Rutgers) in glasshouse. Different concentrations (0, 0.125, 0.25, 0.5, 0.75 and 1 mL/L) of an aqueous solution of the abamectin formulation were applied as a single treatment at transplant or at transplant plus 15 days later to a soil uniformly infested by M. incognita (7 eggs and juveniles/mL soil). Fenamiphos (62.5 c.p. L/Ha) and untreated soil were used as controls. Pots were arranged on benches in a glasshouse at 25 + 2°C, according to a randomized block design with five replications for each treatment. After two months tomato plants were uprooted and fresh and dry top weights were recorded. Severity of the nematode attack (root gall index - RGI) was assessed on each tomato root system according to a 0 - 10 scale. Final nematode population density was calculated summing nematodes extracted from tomato roots by sodium hypochlorite's method and those extracted from 500 mL soil with the Coolen's method. Reproduction rate (r=Pf/Pi) was calculated as ratio between final and initial population density. Data from the experiment were subjected to analysis of variance and means compared by the Least Significance Difference's test (LSD) using the PlotIT program. All abamectin solutions significantly increased fresh and dry top weight in comparison to the untreated control. Root gall index, eggs and juveniles/g root, soil nematode population density and reproduction rate were significantly reduced by all the abamectin treatments in comparison to the untreated control (P=0.05). Nematode population density and reproduction rate in the soil treated with the three highest concentrations of abamectin solution were not significantly different from those calculated in the fenamiphos treated soil.
Effect of an abamectin formulationon the root-knot nematode Meloidogyne incognita on tomato
LAQUALE S;SASANELLI N;D'ADDABBO T
2014
Abstract
Abamectin is a mixture of macrocyclic lactones produced by the actinomycete Streptomyces avermitilis especially known for its insecticidal and acaricidal activities. The effectiveness of an abamectin formulation (Vertimec® EC) for the control of the widespread and polyphagous root-knot nematode Meloidogyne incognita was investigated in a pot experiment on tomato (cv. Rutgers) in glasshouse. Different concentrations (0, 0.125, 0.25, 0.5, 0.75 and 1 mL/L) of an aqueous solution of the abamectin formulation were applied as a single treatment at transplant or at transplant plus 15 days later to a soil uniformly infested by M. incognita (7 eggs and juveniles/mL soil). Fenamiphos (62.5 c.p. L/Ha) and untreated soil were used as controls. Pots were arranged on benches in a glasshouse at 25 + 2°C, according to a randomized block design with five replications for each treatment. After two months tomato plants were uprooted and fresh and dry top weights were recorded. Severity of the nematode attack (root gall index - RGI) was assessed on each tomato root system according to a 0 - 10 scale. Final nematode population density was calculated summing nematodes extracted from tomato roots by sodium hypochlorite's method and those extracted from 500 mL soil with the Coolen's method. Reproduction rate (r=Pf/Pi) was calculated as ratio between final and initial population density. Data from the experiment were subjected to analysis of variance and means compared by the Least Significance Difference's test (LSD) using the PlotIT program. All abamectin solutions significantly increased fresh and dry top weight in comparison to the untreated control. Root gall index, eggs and juveniles/g root, soil nematode population density and reproduction rate were significantly reduced by all the abamectin treatments in comparison to the untreated control (P=0.05). Nematode population density and reproduction rate in the soil treated with the three highest concentrations of abamectin solution were not significantly different from those calculated in the fenamiphos treated soil.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
