There are given results of research of apple tree protection systems with resistance inductors against scab. There is determined effect of weather conditions on the development of scab. There are established variety reaction on the use of inductors, depending on the variety resistance on development of the disease and the biological efficiency of the preparations and the functional condition of plants. There are determined effective protection systems against scab. There are also determined effective application scheme of tank mixtures of fungicides and resistance inductors against scab. There are determined differences in plant response to the application of protective measures, depending on the degree of environmental sustainability of variety – less resistant variety Zhigulevskoye was more labile and responsive to the applied correction.