BEHAVIOR OF SOME ROMANIAN WALNUT VARIETIES TO SCIAPHOBUS SQUALIDUS GYLL. ATTACK

Abstract

Walnut (Juglans regia L.) is an important species for the European and Romanian fruit growing, but, despite its resilience, it can be attacked by specific pests which due to the climatic changes became more active than in the past. This paper presents results on the behavior of some Romanian walnut varieties to the bud weevil Sciaphobus squalidus Gyll attack during 2012- 2014 vegetation period. For the pest, the most favorable years were 2013 and 2014 when the pest incidence (PESINC%) was 11.48-11.88 % and the pest severity (PESSEV0--3) was rated with 2.2- 2.3. All these years the most affected walnut cultivars were ‘Roxana’, ‘Geoagiu 65’, ‘Recular RM’‘Jupanesti’, for which the pest incidence (PESINC%) ranged between 5.17-6.42% and the pest severity (PESSEV0--3) was rated with 2.0-2.5. The other cultivars (‘Mihaela’ and ‘Bratia) were more resilient to the pest attack, for these,the average pest incidence (PESINC%) was between 5.17% and 6.42% and the pest severity (PESSEV0--3) was rated with 1.8-1.9.

Keywords

• : walnut
• Romanian
• Romanian cultivars
• buds weevil