Scholarly record

"NEMAGOLD- - BIO-PRODUCT OF PERSPECTIVE IN THE CONTROL OF ROOT-KNOT NEMATODE (MELOIDOGYNE SPP.) AT TOMATO CROPS UNDER PLASTIC TUNNEL

Elena Bratu, Gabriela Sovarel, Ana Emilia Cenusa, Marius Velea

Abstract

The study was performed in order to establish the efficacy of the biological product пїЅNemagoldпїЅ in the control of root-knot nematodes (Meloidogyne spp.) on tomato crop under plastic tunnel conditions. Experiment was organized on tomato crop (cultivar пїЅPrekos F1пїЅ) strongly attached by root-knot nematode, located in south-east of Romania (Varasti-Giurgiu), during July-September 2016 period. Treatments were applied by drip irrigation during the second vegetation season. пїЅNemagoldпїЅ product having in composition extract of marigold (Tagetes erecta L. - 80%) and seaweed (10%), was tested at total doses of 30 l/ha and 35 l/ha. The both doses have been applied in 3 steps corresponding to the following experimental variants: V1= 10 l/ha x 3 applications at intervals of 30 days; V2= 15 l/ha at first application + 10 l/ha x 2 applications at intervals of 15 days; V3= untreated check. Irrigation rate was 6000 liter water per hectare. First application was made 5 days after crop planting. Evaluation of root attack degree was performed at 40 and 90 days after first application by using a scoring chart (John Bridge & Sam Page, 1980) from 0 to 10. Product efficacy varied between 17.5% - V1 and 70.0% -V2 at 40 days after 1-st application. At 90 days, efficacy registered 22.1% - V1 and 59.0% - V2, while at the untreated tomato crop (V3), the nematodes attack degree has attained 34.3% and 79.3% after 40 and respectively 90 days. Data were statistical assured. пїЅNemagoldпїЅ used at total dose of 35 l/ha gave the best results, providing a very significant decreasing (11% at 40 days; 32, 5% at 90 days) of root-knot nematodes attack, during the vegetation season.

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