Health condition of a Nothofagus pumilio stand affected by Notophorina sp.
In a forest of Nothofagus pumilio (lenga) in northern Chubut, we found a stand affected by Notophorina sp. (Hemiptera, Psyllidae) with outstanding foliar symptoms. We assumed that it is about a peak of abundance, which is the first record in Argentinean Patagonia. Our aim was to characterize the stand and the health condition of affected trees related to the peak abundance of Notophorina sp. In a stand located at 42°41’36.06’’ S - 71°44’42.26’’ W, in the Parque Nacional Los Alerces (Chubut, Argentina), two samplings were carried out in an eighteen day period (T1, T2) during the summer (January and February) of 2020. A health survey was performed and Notophorina sp. abundance was evaluated. Thirty percent of the trees showed defoliation in T1 and this value increased to 50% in T2. The symptoms were chlorosis, necrosis, leaves curling and partial or total defoliation. At T2, the previously affected trees had smaller leaves (1.80±0.38 cm2) than those recently affected (3.79±0.38 cm2), while the leaves of the healthy trees were the largest (6.99±0.38 cm2). The specific leaf area was similar for trees with old and recent infestation (123.3±20.34 cm2/g vs. 159.27±20.34 cm2/g) and significantly higher in healthy trees (289.15±20.34 cm2/g). The population density decreased drastically between both samplings (87%). This study contributes to the bioecological background of Notophorina sp. in the Patagonian Andean region and assesses the effect on its hosts.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Asociación Argentina de Ecología
2023
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| Online Access: | https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/2136 |
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| Summary: | In a forest of Nothofagus pumilio (lenga) in northern Chubut, we found a stand affected by Notophorina sp. (Hemiptera, Psyllidae) with outstanding foliar symptoms. We assumed that it is about a peak of abundance, which is the first record in Argentinean Patagonia. Our aim was to characterize the stand and the health condition of affected trees related to the peak abundance of Notophorina sp. In a stand located at 42°41’36.06’’ S - 71°44’42.26’’ W, in the Parque Nacional Los Alerces (Chubut, Argentina), two samplings were carried out in an eighteen day period (T1, T2) during the summer (January and February) of 2020. A health survey was performed and Notophorina sp. abundance was evaluated. Thirty percent of the trees showed defoliation in T1 and this value increased to 50% in T2. The symptoms were chlorosis, necrosis, leaves curling and partial or total defoliation. At T2, the previously affected trees had smaller leaves (1.80±0.38 cm2) than those recently affected (3.79±0.38 cm2), while the leaves of the healthy trees were the largest (6.99±0.38 cm2). The specific leaf area was similar for trees with old and recent infestation (123.3±20.34 cm2/g vs. 159.27±20.34 cm2/g) and significantly higher in healthy trees (289.15±20.34 cm2/g). The population density decreased drastically between both samplings (87%). This study contributes to the bioecological background of Notophorina sp. in the Patagonian Andean region and assesses the effect on its hosts. |
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