MANAGEMENT AND CONTROL OF AGRILUS AURICHALCEUS REDT. (COLEOPTERA: BUPRESTIDAE) IN BIOLOGICAL RASPBERRY PRODUCTION

Abstract

The study was carried out in а raspberry plantation (2013-2015) in the experimental field of the Institute of Agriculture – Kyustendil. The purpose of this study is to investigate the effect of organic fertilizer application on the stock larvae of Agrilus aurichalceus and population management, using biological plant protection products. According to the results of this study, it has been proved that fertilizing with organic fertilizers has a reductive effect on the survival of the A. aurichalceus population and does not affect the population of the larval endoparasitoid Ttrastichus heeringi in the cultivars Willamette and Lyulin. The relationships between A. aurichalceus and T. heeringi in the conditions of organic raspberry production have been studied. The established degree of parasitism of the larvae by T. heeringi (32.7-68.4%) is capable of reducing and controlling the population of A. aurichalceus in the Willamette without chemical control. Two treatments with bioinsecticides have been carried out for the protection of plants from cultivar Lyulin due to a significantly lower degree of parasitism (18.1-50.0%). The most effective insecticides to the control of adults of A. aurichalceus have been identified: Pyrethrum FS EC-0.05% and NeemAzal®-T/S - 0.3 %. The adult control scheme involves two treatments with bioinsecticides of infested shrubs. The first treatment should be done during the buttoning, the second treatment during the mass flight of beetles (only at an established density of 3-4 beetles/m2).