GRAPE PHYLLOXERA (Daktulosphaira vitifoliae Fitch) DAMAGE IN GRAPEVINES GROWING UNDER TWO SOIL TEXTURES AND IRRIGATION METHODS.

CECILIA B. AGÜERO; CELESTE ARANCIBIA, EMILIANO MALOVINI ; LEONOR DEIS, LILIANA MARTÍNEZ; VILLALBA KEVIN, CARABAJAL FEDERICO

Mendoza

Encuentro; The 20th GiESCO International Meeting (Group of international Experts for Cooperation on Vitivinicultural Systems); 2017

Unidad para el cambio rural,Text. Kopruch, IANIGLA CONICET UNCUYO Gob. de Mza,V. Productora,NETAFIM,MICASENSE,La Enoteca,EMAVE,Fdo.vitivinícola Mza,Cdad de Mza,Gob. Municipal de Gral San Martín,FECOVITA,Bonarda Argentina,

Field observations in Argentinean vineyards, have led to claim that phylloxera grow better in clay soils and under drip irrigation, than in sandy soils and flooding. The aim of this study was to assess phylloxera damage in vines under two irrigation methods or soil textures in controlled conditions. Experiments were carried out with potted Malbec vines in growth chambers with 16 h photoperiod and 28°C+/- 3°C. In one experiment, plants were infested with 100 eggs of phylloxera, and were drip or flood irrigated. In another experiment, plants were grown in sandy or clay soil. Relative chlorophyll content (RCC), main shoot length and leaf number were measured 60 days after infection and evaluated by generalized linear model (GLM) and generalized linear mixed model (GLMM). In the first experiment, an interaction between irrigation method and infection was observed for leaf number, being drip irrigated plants negatively affected by phylloxera. No interaction was observed between soil texture and plant infection, however plants showed more leaves in clay soil. These results partially agree with field observational data regarding irrigation methods while not with soil textures. Undergoing evaluations of other physiological variables and of phylloxera growth in roots will help to clarify these results.