Abstract

PEREZ-VICENTE, Luis et al. Efficacy of anti-oomycetes fungicides in the disinfection of MD2 pineapple slips for the control of Phytophthora nicotianae var. parasitica Dastur. Rev. Protección Veg. [online]. 2017, vol.32, n.2, pp. 00-00. ISSN 2224-4697.

The pineapple crop (Ananas comosus (L.) Merr.) is attacked by several pests that affect its productivity, quality and production costs. The variety MD2 or Golden Ripe is very susceptible to root and heart rot by Phytophthora nicotianae var. parasitica Dastur. The pathogen is transmitted by infected seeds, sporangia disseminated by wind, and water, and chlamydospores existing in infected soils that infect roots, stems and fruits. Two field experiments with a randomized block design and four replicates were carried out at the Agroindustrial Enterprise Ceballos in Ciego de Avila province, to study the efficacy of treatments by dipping pineapple slips into the systemic fungicides mefenoxam + mancozeb, azoxystrobin, fluopicolide + propamocarb, fosetyl Al + propamocarb, fenamidone + propamocarb, and mandipropamid in comparison with the standard treatment with fosetyl Al. The best results were obtained with the treatments mefenoxam + mancozeb (100g +1280 g/100L of water), mandipropamid (50 g/100L), fluopicolide + propamocarb (12.5g + 125g/100L), and fenamidone + propamocarb (44.4g + 667g/100 l), which showed less than 1.6% of infected plants at 110 days after planted. They were followed by azoxystrobin (25 g pc/100L), propamocarb + fosetyl Al (106g + 620g), and fosetyl Al (200 g/100L) with an incidence of 5-10% of infected plants, meanwhile the untreated plots finished with 18% of infected plants. These systemic fungicides can be used for disinfecting pineapple planting material against Phytophthora nicotianae var. parasitica in soils conducive to rot

Keywords : mefenoxam; mandipropamid; propamocarb; fenamidone; fluopicolide; Phytophthora heart rot.

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