Duso Carlo, Zanettin Giulia, Gherardo Pamela, Pasqualotto Giulia, Raniero Damiano, Rossetto Filippo, Tirello Paola, Pozzebon Alberto
Department of Agronomy, Food, Natural resources, Animals and Environment, University of Padova, Viale dell'Università 16, Agripolis, Legnaro, 35020 Padova, Italy.
Insects. 2020 Oct 26;11(11):731. doi: 10.3390/insects11110731.
The Nearctic leafhopper (Fitch), detected in Europe for the first time (north-eastern Italy) in 2004, has remained a minor pest of grapevine for more than 10 years. The first outbreaks of were reported in 2016 in commercial vineyards located in north-eastern Italy. High population densities and severe leaf symptoms (i.e., leaf discoloration and fall) were observed in late summer despite the application of insecticides. Investigations were carried out from 2017 to 2019 in 10 vineyards located in Veneto region (Vicenza and Verona provinces) to shed light on the seasonal abundance of on different cultivars. Pest phenology was studied in six vineyards where the impact of insecticides was minimal. completed three generations in each of the growing seasons. Vineyard colonization by overwintered adults showed a clear edge effect, suggesting the influence of overwintering sites (e.g., rural buildings and hedgerows) in vineyard margins. The impact of natural enemies on pest populations appeared to be limited and mostly related to egg parasitoids. Organic vineyards were more heavily infested by compared to conventional vineyards, likely due to the minimal efficacy of natural insecticides typically used in the former farms.
近北极叶蝉（菲奇）于2004年首次在欧洲（意大利东北部）被发现，十多年来一直是葡萄树的次要害虫。2016年，意大利东北部的商业葡萄园首次报告了该叶蝉的爆发。尽管使用了杀虫剂，但在夏末仍观察到高种群密度和严重的叶片症状（即叶片变色和落叶）。2017年至2019年，在威尼托地区（维琴察和维罗纳省）的10个葡萄园进行了调查，以了解不同葡萄品种上该叶蝉的季节性丰度。在六个杀虫剂影响最小的葡萄园研究了害虫物候。在每个生长季节，该叶蝉都完成了三代繁殖。越冬成虫在葡萄园的定殖表现出明显的边缘效应，表明越冬场所（如农村建筑物和树篱）对葡萄园边缘有影响。天敌对害虫种群的影响似乎有限，且主要与卵寄生蜂有关。与传统葡萄园相比，有机葡萄园受该叶蝉的侵害更严重，这可能是由于前者农场通常使用的天然杀虫剂效果不佳。
