Chemical control of grape phylloxera of leaf (Viteus Vitifolae Fitch) in Medjimurje vineyards | Iskustva u kemijskom suzbijanju trsovog ušenca u Međimurju
2013
Šubić, M.
Grape phylloxera Viteus vitifolae Fitch (Hemiptera: Phylloxeridae) is the main grape pest. Adults and nymphs feeds on leaves and roots but major damage is observed on roots of own rooted Vitis vinifera. Damage on leaves is important in root stock nurseries where chemical control is necessary. Several insecticide formulations are reported as effective against foliar grape phylloxera in Crotaia until the end 2008 (metidation and mineral oil, endosulfan). This study was conducted to evaluate some new insecticides to control the leaf form of pest in field conditions. Insecticide applied to foliage in beginning May, when first yellow crawlers in stem mother galls were observed, or accumulating daily degree-days (DD base 6.4°C) after vines begin to expand the first grape leaves = 225-235°. The most effective were flonicamid and spirotetramat (84-87 days after application efficacy more than 97 %). Other active ingredient (acetamiprid, imidacloprid, thiametoxam, deltametrin and thiacloprid) reduced foliar damage between 79 and 95 %, and pirimicarb was not efficient.
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