Interactions between pupae of the pine processionary moth (Thaumetopoea pityocampa) and parasitoids in a Pinus forest

2015 ◽  
Vol 105 (5) ◽  
pp. 621-628 ◽  
Author(s):  
C.P. Bonsignore ◽  
F. Manti ◽  
E. Castiglione
Keyword(s):  
Environmental Effects ◽  
Morphological Traits ◽  
External Factors ◽  
Thaumetopoea Pityocampa ◽  
Parasitoid Species ◽  
Pine Processionary Moth ◽  
Processionary Moth ◽  
The Impact ◽  
Positive Effect ◽  
Forest Lepidoptera

AbstractParasitoids are significant enemies of many economically important insects and there is some evidence to suggest that their actions have a role in terminating the outbreaks of forest Lepidoptera populations. In this study, we examined the impact of parasitoids on the pupae of the pine processionary moth, and highlighted the presence of several parasitoid species for this developmental stage. A higher rate of parasitism was found when the pupal density in the soil was reduced, but the rate of parasitism was not influenced by pupal morphological traits or by the presence or absence of a cocoon around a pupa. Of the external factors examined, a delay in the time of descent of larvae from the trees had a positive effect on the level of parasitism. Observational data indicated that dipteran and hymenopteran were the most abundant parasitoids to emerge from moth pupae. Our study highlights the complexity of the parasitoid–host dynamics, and stresses the importance of carefully determining environmental effects on host–parasitoid relations.

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

2020 ◽  
Author(s):  
Georgi Georgiev ◽  
Jérôme Rousselet ◽  
Mathieu Laparie ◽  
Christelle Robinet ◽  
Margarita Georgieva ◽  
...  
Keyword(s):  
Abundant Species ◽  
Thaumetopoea Pityocampa ◽  
Pine Processionary Moth ◽  
Processionary Moth ◽  
Cent Mortality ◽  
Baryscapus Servadeii ◽  
Ooencyrtus Pityocampae ◽  
Hatching Percentage ◽  
The Impact ◽  
Historical Range

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).

scholarly journals Dynamics of populations of pine processionary moth (Thaumetopoea pityocampa) in the Republic of North Macedonia during the period 2007-2017

2020 ◽  
Vol 21 (1) ◽  
pp. 77-82
Author(s):  
Sterja Nacheski ◽  
Irena Papazova-Anakieva ◽  
Stanislava Lazarevska ◽  
Blagoj Shurbevski
Keyword(s):  
Pinus Nigra ◽  
Thaumetopoea Pityocampa ◽  
Pine Processionary Moth ◽  
Larval Stages ◽  
Processionary Moth ◽  
The Republic ◽  
The Impact ◽  
Number Of Individuals ◽  
Research Period ◽  
Dynamics Of Populations

This study presents results for the dynamic of the populations of the pine processionary moth (Thaumetopoea pityocampa) during the period 2007-2017 and the impact of reducing factors in the Repub-lic of North Macedonia. The population density was determined by the number of larval nests both per tree and per hectare that varied during the research period. The number of individuals went up between 2007 and 2010, while during the following years it rapidly decreased. Since 2011, an overall prograding trend has been recorded in the several subsequent years. This could be explained by the huge number of individuals from the previous years that were in a diapause. The abundance of pest populations continued to grow in 2016 as no measures were taken. During the winter of 2016/2017, the impact of the extremely low temperatures on pest mortality was monitored in 2016-2017 generation. The density of the populations came to latency due to the very large number of dead larvae of second and third larval stages. We recorded a 100% mortality of larvae in plantations of Pinus nigra in the regions near Prilep, Sveti Nikole, Shtip, Kochani and Negotino Villages.  

scholarly journals Bats from different foraging guilds prey upon the pine processionary moth

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7169 ◽  
Author(s):  
Inazio Garin ◽  
Joxerra Aihartza ◽  
Urtzi Goiti ◽  
Aitor Arrizabalaga-Escudero ◽  
Jesús Nogueras ◽  
...  
Keyword(s):  
Behavioral Response ◽  
Sampling Site ◽  
Thaumetopoea Pityocampa ◽  
Forest Pest ◽  
Pine Processionary Moth ◽  
Processionary Moth ◽  
Lack Of Information ◽  
Dispersal Behavior ◽  
Foraging Guilds ◽  
Typical Prey

Outbreaks of the processionary moth Thaumetopoea pityocampa (Denis & Schiffermüller, 1775), a forest pest from the Palearctic, are thought to induce a behavioral response of bats, but up to now the moth has been seldom identified as bats’ prey. Studies on bat diets suggest moths with cyclical outbreaks attract a wide array of bat species from different foraging guilds. We test whether bats feed upon T. pityocampa in the Iberian Peninsula irrespective of the predator’s ecological and morphological features. We found that seven out of ten bat species belonging to different foraging guilds contained T. pityocampa DNA in their faeces and no difference was found in the foraging frequency among foraging guilds. A different size of the typical prey or the lack of fondness for moths can explain the absence of the pest in some bat species. Moreover, the intraspecific foraging frequency of T. pityocampa also changed with the sampling site likely representing differential availability of the moth. Lack of information on flight and dispersal behavior or the tympanate nature of the adult moth complicates understanding how different foraging guilds of bats prey upon the same prey. Our data suggests that T. pityocampa is a remarkable food source for many thousands of individual bats in the study area and we anticipate that more bats besides the species studied here are consuming this moth.

scholarly journals In Search of Pathogens: Transcriptome-Based Identification of Viral Sequences from the Pine Processionary Moth (Thaumetopoea pityocampa)

Viruses ◽  
2015 ◽  
Vol 7 (2) ◽  
pp. 456-479 ◽  
Author(s):  
Agata Jakubowska ◽  
Remziye Nalcacioglu ◽  
Anabel Millán-Leiva ◽  
Alejandro Sanz-Carbonell ◽  
Hacer Muratoglu ◽  
...  
Keyword(s):  
Thaumetopoea Pityocampa ◽  
Pine Processionary Moth ◽  
Processionary Moth ◽  
Viral Sequences

scholarly journals Calibrating the Severity of Forest Defoliation by Pine Processionary Moth with Landsat and UAV Imagery

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3278 ◽  
Author(s):  
Kaori Otsu ◽  
Magda Pla ◽  
Jordi Vayreda ◽  
Lluís Brotons
Keyword(s):  
Forest Health ◽  
Ground Truth ◽  
Stress Index ◽  
Coefficient Of Determination ◽  
Thaumetopoea Pityocampa ◽  
Landsat 8 ◽  
Mediterranean Forests ◽  
Ground Truth Data ◽  
Pine Processionary Moth ◽  
Processionary Moth

The pine processionary moth (Thaumetopoea pityocampa Dennis and Schiff.), one of the major defoliating insects in Mediterranean forests, has become an increasing threat to the forest health of the region over the past two decades. After a recent outbreak of T. pityocampa in Catalonia, Spain, we attempted to estimate the damage severity by capturing the maximum defoliation period over winter between pre-outbreak and post-outbreak images. The difference in vegetation index (dVI) derived from Landsat 8 was used as the change detection indicator and was further calibrated with Unmanned Aerial Vehicle (UAV) imagery. Regression models between predicted dVIs and observed defoliation degrees by UAV were compared among five selected dVIs for the coefficient of determination. Our results found the highest R-squared value (0.815) using Moisture Stress Index (MSI), with an overall accuracy of 72%, as a promising approach for estimating the severity of defoliation in affected areas where ground-truth data is limited. We concluded with the high potential of using UAVs as an alternative method to obtain ground-truth data for cost-effectively monitoring forest health. In future studies, combining UAV images with satellite data may be considered to validate model predictions of the forest condition for developing ecosystem service tools.

scholarly journals Biocontrol of the pine processionary moth Thaumetopoea pityocampa (Denis andSchiffermuller, 1775) with plant extracts

2019 ◽  
pp. 73-84
Author(s):  
M. Kherroubi ◽  
F. Mouhouche ◽  
Z. Zerrouk Izzeddine ◽  
M. Chahbar
Keyword(s):  
Plant Extracts ◽  
Lethal Dose ◽  
Probit Analysis ◽  
Populus Nigra ◽  
Thaumetopoea Pityocampa ◽  
Publication Date ◽  
Taxus Baccata ◽  
Pine Processionary Moth ◽  
Processionary Moth ◽  
Significant Difference

Biocontrol of the pine processionary moth Thaumetopoea pityocampa (Denis and Schiffermuller, 1775) with plant extracts Kherroubi, M. Mouhouche, F. Zerrouk Izzeddine, Z. Chahbar, M. Key words Thaumetopoea pityocampa, LD50, Populus nigra, Taxus baccata Reception date: 15/03/2019 | Acceptation date: 06/06/2019 | Publication date: 04/0/2019 © Copyright belongs to the authors, who license the journal Arxius de Miscel·lània Zoològica to publish the paper under a Creative Commons Attribution 4.0 License, which permits its distribution and reproduction in any medium, provided the original authors and source, the journal Arxius de Miscel·lània Zoològica, are cited. Download: PDF | Cite Share on: | Biocontrol of the pine processionary moth Thaumetopoea pityocampa (Denis and Schiffermuller, 1775) with plant extracts Kherroubi, M. Mouhouche, F. Zerrouk Izzeddine, Z. Chahbar, M. Abstract Biocontrol of the pine processionary moth Thaumetopoea pityocampa (Denis and Schiffermuller, 1775) with plant extracts The purpose of this study was to propose alternative solutions based on the use of natural, bio-insecticidal products to fight against the processionary moth, Thaumetopoea pityocampa (T. pityocampa), considered a defoliator because of the damage it causes to silvicultural. This insect also causes health problems in forests or wooded areas open to the public. To meet this objective, we evaluated the toxicity of six extracts from two plants: Taxus baccata and Populus nigra, collected from the regions of Blida, against first instar larvae of T. pityocampa. The results from these biological tests showed a significant difference between the six extracts. The LD50 (lethal dose) values were calculated by probit analysis using Finney’s table. The LD50 was also low for the two extracts Populus Methanol and Populus Methanol Chloroform (1.4 mg/ml and 3.3 mg/ml, respectively). However, the LD50 was relatively high for the rest of the extracts. In conclusion, the Bio-insecticides of Populus Methanol (PMP) and Populus Methanol Chloroform (PMC) showed to be active and could be integrated into the biological control of the egg parasitoids of T. pityocampa.

scholarly journals IMPACT OF EXTERNAL BUSINESS ENVIRONMENT FACTORS ON INTERNATIONALIZATION OF LITHUANIAN-BORN GLOBAL COMPANIES

Ekonomika ◽  
2011 ◽  
Vol 90 (3) ◽  
pp. 120-135 ◽  
Author(s):  
Ramūnas Časas ◽  
Vilma Dambrauskaitė
Keyword(s):  
Theoretical Analysis ◽  
Business Environment ◽  
External Factors ◽  
Born Global ◽  
Diamond Model ◽  
Global Companies ◽  
Survey Results ◽  
The Impact ◽  
Positive Effect ◽  
Born Global Firms

The paper examines the external factors that influence the internationalization of the Born Global firms in Lithuania. The identification of such factors is based on M. Porter’s National Diamond model. Theoretical analysis of the model enabled us to distinguish 23 factors as potentially influencing the internationalization of firms. The impact of these factors on Born Global firms was explored upon performing a survey of 50 Lithuanian firms of this sort. The survey results have revealed seven factors as having a positive effect on the internationalization of Lithuanian Born Global firms.

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