Comparative studies of egg parasitoids of the pine processionary moth (Thaumetopoea pityocampa, Den. & Schiff.) in historic and expansion areas in France and Bulgaria

IF 3 2区农林科学 Q1 FORESTRY

Forestry Pub Date : 2020-07-08 DOI:10.1093/forestry/cpaa022

G. Georgiev, J. Rousselet, M. Laparie, C. Robinet, M. Georgieva, G. Zaemdzhikova, A. Roques, Alexis Bernard, Laura Poitou, M. Buradino, C. Kerdelhué, J. Rossi, M. Matova, P. Boyadzhiev, P. Mirchev

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引用次数: 4

Abstract

To investigate enemy pressure across the range of the pine processionary moth (Thaumetopoea pityocampa, Den. & Schiff.) as it spreads northwards in Europe because of climate change, a survey of 206 egg batches from historical and newly colonized areas at both the westernmost and the easternmost ends of the front was carried out in 2016–2018. Out of them, 97 egg batches were collected from nine locations in three regions in France and 109 from four localities in two regions in Bulgaria, both within historical and newly colonized ranges of the pest. The average number of eggs per batch collected in Bulgaria (226.6 ± 43.2) was higher than that in France (194.3 ± 50.1). However, the hatching percentage was higher in French samples, varying from 69.8 to 95.7, vs 49.8 to 85.2 per cent in Bulgarian samples. Four primary parasitoids (Ooencyrtus pityocampae, Baryscapus servadeii, Anastatus bifasciatus, Trichogramma sp.) and a hyperparasitoid (Baryscapus transversalis, found only in two regions of the historical range in Bulgaria) were identified. The oligophagous species B. servadeii was present at all sites within the historical range of the pest. In newly colonized areas, the impact of primary parasitoids on the host was distinctly low, suggesting that they lag behind the range expansion of pine processionary moth. In France, the most abundant species in the T. pityocampa parasitoid complex were B. servadeii in Ré Island and Orléans (97.3 and 87.4 per cent, respectively), and Trichogramma sp. (99.7 per cent) in a newly colonized locality in Fréhel. Ooencyrtus pityocampae prevailed in three of four Bulgarian localities (72.1 per cent in Sandanski, 89.7 per cent in Maglizh and 65.7 per cent in Sladak kladenets), whereas B. servadeii was the most abundant in Gega (75.4 per cent). Mortality of B. servadeii and O. pityocampae caused by the hyperparasitoid B. transversalis amounted to 4.8–6.2 per cent. The impact of predators on the pine processionary moth in the egg stage was negligible at most sites, reaching 12.5 per cent in only one site (Maglizh).

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松业蛾卵类寄生物的比较研究。& Schiff.)在法国和保加利亚的历史和扩展地区

研究了松林行军蛾(Thaumetopoea pityocampa, Den)活动范围内的敌人压力。由于气候变化，当它在欧洲向北传播时，2016-2018年对前线最西端和最东端历史和新殖民地区的206批鸡蛋进行了调查。其中，从法国3个地区的9个地点收集了97批鸡蛋，从保加利亚2个地区的4个地点收集了109批鸡蛋，这些地点都在这种害虫的历史范围和新殖民范围内。保加利亚每批次平均采集鸡蛋数(226.6±43.2)高于法国(194.3±50.1)。然而，法国样本的孵化率较高，从69.8%到95.7%不等，而保加利亚样本的孵化率为49.8%到85.2%。鉴定出4种初级寄生蜂(pityocampae Ooencyrtus pityocamae, Baryscapus servadeii, Anastatus bifasciatus, Trichogramma sp.)和1种超寄生蜂(Baryscapus transversalis，仅在保加利亚历史范围的两个地区发现)。在该害虫历史分布范围内的所有地点均存在寡食性食蚜螨。在新定殖区，初生寄生蜂对寄主的影响明显较低，表明初生寄生蜂对寄主的影响滞后于行军蛾的活动范围扩张。在法国，在r岛和orlsamans中，以servadeii(分别占97.3%和87.4%)和Trichogramma sp.(占99.7%)在frsamhel的一个新定植地最丰富。保加利亚4个地方中的3个地区(桑丹斯基为72.1%，马格利兹为89.7%，斯拉夫克克拉德涅茨为65.7%)普遍存在pityocampae卵圆虫，而Gega的servadeii卵圆虫数量最多(75.4%)。高寄生性横纹夜蛾对servadeii和pityocamae的致死率为4.8% ~ 6.2%。在大多数地点，捕食者对卵期松林行军蛾的影响可以忽略不计，只有一个地点(Maglizh)的致死率为12.5%。

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来源期刊

Forestry 农林科学-林学

CiteScore

6.70

自引率

7.10%

发文量

审稿时长

12-24 weeks

期刊介绍： The journal is inclusive of all subjects, geographical zones and study locations, including trees in urban environments, plantations and natural forests. We welcome papers that consider economic, environmental and social factors and, in particular, studies that take an integrated approach to sustainable management. In considering suitability for publication, attention is given to the originality of contributions and their likely impact on policy and practice, as well as their contribution to the development of knowledge. Special Issues - each year one edition of Forestry will be a Special Issue and will focus on one subject in detail; this will usually be by publication of the proceedings of an international meeting.