Evaluación de dos elicitores y dos microorganismos en mezcla para el manejo agroecológico de oidio (Podosphaera aphanis Wallr) en el cultivo establecido de fresa (Fragaria sp. Duch).

Abstract

The investigation aimed to evaluate two elicitors and two microorganisms in mixture for the agroecological management of powdery mildew (Podosphaera aphanis Wallr) in the established crop of strawberry (Fragaria sp. Duch). One experiment was conducted for each variety (Monterey, San Andreas, Albion, Cabrillo), a randomized complete block design (RCBD) was used for each experiment. In each variety, four treatments with four replications were implemented, with a total of 16 experimental units per variety. There were four treatments (T1) Control without product application; (T2) 3% salicylic acid with a dose of 1.3 cc/L of water; (T3) 1% gentian violet with a dose of 1 cc/L of water; (T4) Trichoderma + Bacillus subtilis with a dose of 1.5 g/L of water. The frequency of application was every 10 days by foliar application. The evaluated indicators were percentage of incidence, percentage of severity, total yield, yield by category and soluble contents. These ones were evaluated every five days during 10 weeks of the fruits of the four representative plants of each treatment. From the results gotten in all the varieties the best treatment that decreased the level of incidence and severity of powdery mildew was the treatment based on Trichoderma + Bacillus subtilis. This treatment also increased the yield, the soluble content and reached the best benefit-cost ratio (B/C). It is concluded that microorganisms applied in mixture get better results of all the indicators when controlling mostly the attack of powdery mildew in all the varieties. It is recommended to use the mixture of Trichoderma + Bacillus subtilis to reduce the level of powdery mildew in all strawberry varieties.