Abstract

DELGADO CACERES, Laura Rosana  and  GAONA MENA, Edgar Francisco. Control of Spodoptera frugiperda Smith (Lepidoptera: Noctuidae) with extracts of Polygonum hydropiperoides Michx (Ka'atái) under laboratory conditions. Investig. Agrar. [online]. 2012, vol.14, n.1, pp.5-9. ISSN 2305-0683.

The experiment was performed at the Laboratory of the Division of Entomology, Department of Plant Protection, Faculty of Agricultural Sciences (FCA) of the National University of Asunción (UNA), in the city of San Lorenzo, under controlled conditions of temperature of 25 + 2°C, relative humidity 70 + 10% and 12 hours photoperiod. The aim of the study was to evaluate the insecticidal effect of ka'atái extract (Polygonum hydropiperoides Michx), at different doses for control of armyworm (Spodoptera frugiperda Smith), assuming that the higher the dose correspond higher mortality of larvae. The design used was completely randomized, with six (6) treatments and five (5) repetitions, applied to first instar larvae, being fed corn husks. We performed an analysis of variance (ANOVA) and Tukey subjected to the 5% probability of error. Assessments were made for 7 consecutive days after application. The results demonstrated that T6 treatment dose (ka'atái 50%) was the most effective, having a 82% of control.

Keywords : Spodoptera frugiperda,; Polygonum hydropiperoides; Natural control.

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