Manejo da queima das flores e da podridão-parda do pessegueiro cultivado em sistema orgânico

Abstract

MANAGEMENT OF BLOSSON BLIGHT AND BROWN ROT PEACH DISEASES IN ORGANIC SYSTEMSABSTRACT -The aim of this work was to test the use of phosphites, lime sulfur, iodine and Trichothecium roseum, in the management of blossom blight and brown rot peach diseases, caused by Monilinia fructicola in Granada and Chimarrita cultivars, in organic systems. The treatments were: 1) lime sulfur + iodine (sprayed in blooming and pre-harvest); 2) alternating treatments between lime sulfur + iodine, CaB phosphites and T. roseum (sprayed in blooming), K phosphite and T. roseum (sprayed in pre-harvest); 3) T. roseum (sprayed in blooming and in pre-harvest); 4) control (no-treatment). The treatments were applied until one week before the first harvest. The incidence of the diseases was quantified at blooming, green fruits, harvest and post-harvest. The incidence of the diseases in the control treatment ranged from 22 to 72% at blooming, 19 to 30%, at green fruits and 18 to 61% at harvest. All treatments reduced the disease incidence at blooming (49 to 73%) and green fruit (57 to 84%) comparing to the control, for both cultivars. Significant results were obtained for post-harvest in Granada cultivar with 54% reductions of disease incidence in treatment 1, and 30% in treatment 2. None of the treatments were efficient to reduce the disease at harvesting.

Reação de genótipos de pessegueiro à podridão parda

“…A podridão parda é favorecida pelas condições de clima temperado, realidade encontrada nas principais regiões produtoras do Rio Grande do Sul e Santa Catarina (Negri et al, 2011). Em virtude desta condição, são necessárias várias aplicações preventivas de fungicidas para controlar a doença sendo, até o momento, de melhor eficiência (Pavanello et al, 2015), mas de maior impacto ao ambiente e consumidores.…”