DESFOLHA NO FEIJOEIRO CAUSADA POR Diabrotica speciosa INCLUINDO MEDIDAS PROTETIVAS

Abstract

The bean crop is widely cultivated in all Brazilian regions, being a product of great acceptance by consumers. However, difficulties in managing this plant prevail, especially in relation to herbivorous insects. Tactics that comply with Integrated Pest Management should be investigated to control Diabrotica speciosa, a difficult to control defoliator in common bean. The objective was to evaluate calcium and magnesium silicate, via planting furrow, in common bean plants on plant resistance to attack by this pest, in two cultivars, in terms of percentage of defoliation. The experiment was conducted in the experimental area of the Horticulture sector of the Federal Institute of Goiano, Campus Urutaí, with a completely randomized design, factorial scheme 2 (cultivars) x 6 (silicon doses) and eight replications. The treatments involve the combination of two carioca bean cultivars (BRS Pérola and BRS Pontal) and six doses of silicon (0, 42, 84, 126, 168 and 201 mg. dm-3), using calcium and magnesium silicate as a source which has 10.5% of silicon, being conducted in a greenhouse. The use of Si in the soil promotes satisfactory results by decreasing the percentage of defoliation in common bean plants and these responses varied depending on the cultivars.