Biodestructors efficiency against sweet cherry (Cerasus avium Moench.) Coccomyces hiemalis Higg.

Abstract

Spraying of the sweet cherry plantations with the biodestructor Ekostern and preparation Urea against Coccomyces hiemalis Higg. was carried out in the autumn 2016-2018. The highest technical efficiency (79.5 %) was achieved when applying Ekostern – 2.0 l/ha. The leaves affection was spot was the least – 6.9 % with the disease development intensity 1.1%. The larger amount of the affectioned leaves was detected in the variants with the combined use of Ekostern (1.0 l/ha) and Urea (25.0 kg/ha) (8.3 and 1.5 % respectively) as well as Urea – 50.0 kg/ha (11.8 and 2.8%). Owing to the fallen leaves mineralization the mass of the substrate on which the Coccomyces hiemalis Higg causative agent hibernated appeared to reduce as a result of which the resource of the primary infection sources and the disease spread intensity were limited in the springtime period. The researched preparation Ekostern concerning the sweet cherry leaves destruction activity exceeded the reference preparation Urea by 1.4 times. Under the combined application of Ekostern and Urea with half standards of cost these means technical efficiency decreased by 1.2 times as compared to the Ekostern separate application and in comparison with the full hectare Urea standard was higher by 1.2 times. As a result of the leaves treatment with Ekostern this mean inhibitory influence on the pathogene reproductive function displayed itself that expressed itself in limiting the fruiting bodies (apothecia) formation. Their number was less as compared to the control in all the variants. Urea in concentration of 5 % displayed the lowest effectivity, the preparations Ekostern (2.0 l/ha) without adding Urea and in the combination with it with the half standards of costs did the highest effectivity (83.3 %). Their efficiency was 1.5-1.7 times higher in comparison with the reference.