RESISTANCE OF PROMISING POTATO VARIETIES TO THE MOST IMPORTANT BEETLE PESTS IN THE CONDITIONS OF THE NORTHWEST OF THE EUROPEAN PART OF RUSSIA AND THE SOUTH OF THE FAR EAST

Abstract

The article provides the results of evaluation of 10 promising potato varieties for the group resistance to the Colorado potato beetle Leptinotarsa decemlineata Say and to the Potato ladybird Henosepilachna vigintiomaculata Motsch. The researches were performed by field methods with artificial colonization of plants of the studied varieties in 1st instar, in the quantity of 30–100 larvae for each potato variety, and were held: according to the Colorado beetle – on experimental field of the All-Russian Research Institute for Plant Protection (Saint-Petersburg – Pushkin); according to the potato ladybird – on experimental field of the Federal Scientific Center of Agricultural Biotechnology of the Far East named after A.K. Chaikа (Primorsky Krai, Ussuriysk). Examples of potato varieties from the new assortment confirm the significant similarity (parallelism of developing) of the trophic reactions of both species, which have the same type of nutrition and many similar features of development biology. As the first result, it has shown that the Severnyi and Smak varieties have a group resistance to both phytophages with a survival of 10–20% of larvae before pupation. In other side, the Avgustin and Dalnevostochnyi varieties noted as a favourable for the development of these pests with a survival of 45–75% of larvae.