Abstract
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.
Highlights
Forest areas are estimated to cover about four billion hectares worldwide, including 30 % of the land area (FAO, 2015)
Forty–eight hours after the application of the compounds tested at different concentrations against the 1st instar larvae of T. pityocampa, we found that the extracts Populus Methanol–Water (PME) and Populus Methanol Chloroform (PMC) were highly toxic, causing mortality averages, respectively, of 50 % and 35 % for dose 1 (D1) (2 mg/ml), 88.35 % and 40 % for dose 2 (D2) (4 mg/ml), and 100 % and 95 % for dose 3 (D3) (8 mg/ml)
The multiple comparisons of the averages between the different plant extracts using the test of least significant differences (LSD) show no significant difference between extracts Taxus Methanol Chloroform (TMC) and Taxus Methanol Pure (TMP), TMP and PME, Taxus Methanol–Water (TME) and PME
Summary
Forest areas are estimated to cover about four billion hectares worldwide, including 30 % of the land area (FAO, 2015). In Algeria, forest covers an area of 4.7 million hectares with an afforestation rate of 11 % (DGF, 2007). The requirement to protect this cedar is always upstream of forestry programs. These biotic communities are threatened by various species of defoliators, mostly the pine processionary moth, Thaumetopoea pityocampa (Fraval, 2007). This primary insect weakens its host and exposes it to other insects, in particular, xylophages (Zamoum, 2002)
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