RESISTANCE TO DISEASES OF NEW INTRODUCED AND SELECTION VARIETIES OF APPLE OF DAGESTAN
The scientific work provides indicators of the degree of resistance to diseases of new introduced and breeding apple varieties of Dagestan. Various varieties were investigated in order to identify the degree of disease resistance of new introduced and breeding apple varieties of Dagestan. Our studies have shown that the degree of resistance to diseases (scab and powdery mildew in new breeding (Dagestan) and foreign introduced scab-resistant (immune) apple varieties is not the same. significant limits, that is, from 1.5 points (a new breeding variety Umzakhrat, scab-resistant - Prima and up to 3.2 points (the control one is a standard weakly scab-resistant variety Renet Simirenko, and the degree of scab damage in apple varieties varies from 0.7 -0 , 8 points (variety Prima, Priscilla, Umzakhrat and Battalovskoye and up to 2.6 - 3.0 points (zoned - control varieties - Melba and Renet Simirenko). It can be seen that the leaves of the same variety on trees are stronger (more ) are affected by scab than fruits.Studies have shown that new selection varieties of apple trees in Dagestan in terms of the degree of resistance to scab are not only not inferior to zoned nym - standard (control) apple varieties, but some varieties (Battalovskoe, Umzakhrat and Letnee Dagestan) even significantly exceed the control - standard and introduced scab-resistant (immune) varieties.