RESISTANCE OF PEAR AND QUINCE CLONAL ROOTSTOCKS TO BIOTIC FACTORS

Pears and quinces are fruits that are very often damaged by various diseases and pests. Diseases and pests cause great damage to fruit and berry, vegetable and ornamental plants. In order for agricultural plants to be tasty and fruitful, they must be healthy. The results of field observations made it possible to notify differences in pear and quince clonal rootstocks susceptibility to pests: pear gall aphid, cherry slimy sawfly, and green apple aphid. The researchers also classified the clonal rootstocks of pear and quince according to their resistance to the main pests. Pear clonal rootstocks PG 12 (k), PG 17-16, PG 2, PG 333 were not damaged by pear gall mite. Quince clonal rootstocks VA 29 (k) and Provanskaya showed high resistance to green apple aphid. Examined pear and quince clonal rootstocks have practical significance and can be recommended for further breeding programs.