Evaluación de la actividad insecticida del extracto acuoso de molle (Schinus molle L.) frente al gusano blanco de la papa (Premnotrypes vorax Hustache)

Abstract

The present research project was carried out with the objective of evaluating the insecticidal activity of molle aqueous extract (Schinus molle L.) against white worm (Premnotrypex vorax Hustache.) Of the potato, in her stages of insect adult ,larvae, and eggs at the Technical University of Ambato, Faculty of Agricultural Sciences, Laboratories of Botany, Chemistry and Plant Health.The extract for the test was obtained by the steam entrainment evaporation technique at a concentration of 20%. The experimental design that was used was randomized blocks with 3 treatments one control and 4 replicates, data were taken with 3 frequencies repeated over time (24, 48, 72 hours). The analysis of variance (ADEVA) was performed according to the experimental design proposed, Tukey significance tests at 5%, where the best results were: for adult insects mortality, 16,67 %, with D2 dose (10% ) At 24 hours after the extract was applied, in the case of larval mortality, 16,67% was recorded, with a D3 (15%) at 72 hours of the opposite application of adults, in the case of eggs , The rate of inhibition of larval hatching the dose that acted most effectively is D1 (5%) with a result of 25% at 24 hours of application, to avoid eggs hatching a low dose of Extract and acts in the shortest time with a mechanical effect of dehydration of eggs and therefore preventing the hatching of the same. To determine costs, an analysis was carried out with the preparation of 1000 ml of extract and applying a profit margin of 35% giving a total value of $ 44.70 and a unit cost of 4.70 per 100 ml of extract.