The system of plant protection of cucumbers from root rot in greenhouses

Goal. To study the antagonistic and protective properties of the biological preparation Trichodermin, p (titer 1.5 × 108 spores / ml) based on the producer strain Trichoderma lignorum CK in relation to the complex of pathogens of root and root rot (Fusarium oxysporum Sh, F. solani sp. Cuarbitae, F. moniliforme Sh, F. culmorum Sacc, Fusarium solani App. et Wr) indoor cucumbers to protect crops throughout the growing season. Methodology. The effectiveness of the biological product was evaluated in greenhouses in the Kiev region in 2016—2018. On crops of cucumbers (hybrid Courage F1) with various methods of application — seed treatment and spraying of plants. To assess the damage of cucumber plants by root rot, we used data on the spread and development of the disease in the experimental and control plots, the counts were carried out on a four-point scale VIZR in the modification of V.F. Peresypkina and V.M. Pidoplichko. Results. As a result of the studies, the high technical efficiency of the use of biological preparations in the crops of cucumbers in greenhouse agrocenoses was established. When treating seeds before planting with a 1% solution of the biological preparation Trichodermin, p based on the producer starch Trichoderma lignorum CK, not one seedling died from root rot, but at the 45th and 65th stages of development according to the BBCH scale, technical efficiency decreased accordingly to 68.3 and 59.5%. Repeated application of the biological preparation Trichodermin, p with a consumption rate of 10 l / ha by three sprays during the growing season in the development phase 74—86 on the BBCH scale showed high technical efficiency (85.3%) in protecting plants against root rot. Findings. An effective method of protecting cucumber crops in closed ground from root rot is an integrated approach to biocontrol — treating seeds before planting and spraying plants with the biological preparation Trichodermin P, which showed a technical efficiency of 85.3%. Monitoring the development of root rot in a critical period of development allows you to reduce root rot damage by 2.2 times and additionally obtain up to 7.7 kg / m2 of vegetable products.