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Evaluating the presence of larvae of Lobesia botrana (Denis & Schiffermüller) developing on olive trees in some central-southern Italian regions
Phytoparasitica ( IF 1.4 ) Pub Date : 2020-10-28 , DOI: 10.1007/s12600-020-00861-0
Andrea Sciarretta , Pasquale Calabrese , Pasquale Trematerra

The present study was conducted in four central-southern Italian regions (Abruzzo, Campania, Molise, Puglia) in the years 2008 and 2016–2018, with the aim to verify in hilly areas characterized by the coexistence of vineyards and olive groves, the presence, frequency and density on olive trees of the larval instars of the European grapevine moth, Lobesia botrana on olive tree flowers, and to compare these parameters with those of other lepidopteran species as well. The sampling collection was conducted on the selected plots twice in each spring, during the phenological phase of flowering. The Lepidoptera larvae found in flower buds were identified through a chaetotaxy analysis. During samplings, 384 larvae belonging to three families (Geometridae, Tortricidae, and Praydidae) were found. The olive moth, Prays oleae, was by far the most abundant species (89.8% of the total collections) and was found in all samplings. L. botrana represented 8.2% of collected specimens and was found in all sampled fields, except in Molise during 2017. Prays oleae populations were significantly more abundant compared to L. botrana populations in all cases, except in Campania during 2017. The largest L. botrana populations were found in 2008 in Abruzzo olive groves, with 0.3 larvae per inflorescence, whereas in the other years and experimental fields the densities ranged between 0 and 0.14 larvae per inflorescence, from 3 to 24 times lower compared to P. oleae. At similar levels of infestation, L. botrana did not represent a harmful pest for olive trees; however, its presence cannot be considered occasional, as it has been found constantly, year after year, even on different olive cultivars. Kruscal-Wallis results showed significant differences among the olive orchards differently related with vineyards and suggests a direct link of L.botrana populations in olive groves and neighbouring vineyards. Olive trees located near vineyards can thus represent an important infestation focus and an insect reservoir, from which the first annual generation of L. botrana adult moths easily move and colonise the surrounding areas, including the neighbouring vineyards. Our results should be considered in IPM programmes for the control of L. botrana in those territories where vineyards and olive trees are closely cultivated.

中文翻译:

评估在意大利中南部一些地区的橄榄树上发育的 Lobesia botrana (Denis & Schiffermüller) 幼虫的存在

本研究于 2008 年和 2016-2018 年在意大利中南部的四个地区(阿布鲁佐、坎帕尼亚、莫利塞、普利亚大区)进行,旨在验证以葡萄园和橄榄园共存为特征的丘陵地区, ,频率和密度在欧洲葡萄蛾幼虫幼虫的橄榄树上,橄榄树花上的 Lobesia botrana,并将这些参数与其他鳞翅目物种的参数进行比较。每年春季在开花的物候期对选定的地块进行两次采样收集。在花蕾中发现的鳞翅目幼虫是通过毛状体分析鉴定的。在取样过程中,发现了属于三个科(地蛾科、蛞蝓科和蛱蝶科)的 384 只幼虫。橄榄蛾,Prays oleae,是迄今为止最丰富的物种(占总收藏的 89.8%),并且在所有样本中都被发现。L. botrana 占采集标本的 8.2%,在所有采样田中均发现,2017 年期间在莫利塞除外。与 L. botrana 种群相比,除 2017 年在坎帕尼亚外,在所有情况下,Prays oleae 种群均显着丰富。最大的 L. botrana。 botrana 种群于 2008 年在阿布鲁佐橄榄树林中发现,每个花序有 0.3 个幼虫,而在其他年份和实验田中,密度范围在每个花序 0 到 0.14 个幼虫之间,与 P. oleae 相比低 3 到 24 倍。在类似的侵染水平下,L. botrana 并不代表橄榄树的有害害虫;然而,它的存在不能被认为是偶然的,因为它年复一年地不断被发现,即使在不同的橄榄品种上。Kruscal-Wallis 结果显示与葡萄园不同的橄榄园之间存在显着差异,并表明橄榄树和邻近葡萄园中的 L.botrana 种群之间存在直接联系。因此,位于葡萄园附近的橄榄树可以代表重要的侵染焦点和昆虫储存库,第一代 L. botrana 成年蛾很容易从那里移动并在周围地区定居,包括邻近的葡萄园。我们的结果应该在 IPM 计划中考虑,以便在那些葡萄园和橄榄树种植密集的地区控制 L. botrana。橄榄树和邻近葡萄园中的 botrana 种群。因此,位于葡萄园附近的橄榄树可以代表重要的侵染焦点和昆虫储存库,第一代 L. botrana 成年蛾很容易从那里移动并在周围地区定居,包括邻近的葡萄园。我们的结果应该在 IPM 计划中考虑,以便在那些葡萄园和橄榄树种植密集的地区控制 L. botrana。橄榄树和邻近葡萄园中的 botrana 种群。因此,位于葡萄园附近的橄榄树可以代表重要的侵染焦点和昆虫储存库,第一代 L. botrana 成年蛾很容易从那里移动并在周围地区定居,包括邻近的葡萄园。我们的结果应该在 IPM 计划中考虑,以便在那些葡萄园和橄榄树种植密集的地区控制 L. botrana。
更新日期:2020-10-28
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