Severity Assessment of Dieback in Green Cypress (Cupressus sempervirens L.) within the Western Traras Mountains (Northwestern Algeria) | Chapter 1 | Research Perspective on Biological Science Vol. 10

 

The Common Cypress (Cupressus sempervirens L.) is a tree representative of the Mediterranean flora, and is traditionally associated with cemeteries, symbolising mourning in the Mediterranean region. Dieback in forest trees is a complex phenomenon whose responsible factors can be diverse and not easily identifiable and prioritised, and they lead to general deterioration, which often ends with the death of the trees. The objective of this study is to characterize symptomatologically the decline of green cypress in the mountains of the Western Traras. The experimental approach prevails in the installation of the sampling units through all the tasks of Cyprès desperis in the region of Bab El Assa and Marsa Ben M'hidi. These sampling units number 25, with a surface area of 10 ares, or 450 stems sampled. The overall dieback index estimated at 2.6564 shows that the stands sampled are at the beginning of dieback. The results obtained show that 36% of the stands are at the beginning of dieback. 24% of the stands are declining, while 16% exhibit severe decline. Therefore, monitoring and precautions are necessary for maintaining the health of the Cypress tree.

 

Author(s) Details

Nichane Mohamed
Department of Agricultural Sciences, Institute of Sciences, University of Naama, Algeria.

 

Please see the book here :- https://doi.org/10.9734/bpi/rpbs/v10/8653A

State of Knowledge of the Entomofauna of Some Resinous Species of the Traras Mountains (North West Algeria) | Chapter 9 | Contemporary Research and Perspectives in Biological Science Vol. 10

As part of the biocenotic study of insects related to coniferous species in the Western Traras region (Tlemcen), as complete a knowledge as possible of the entomofauna frequenting, in particular, the Aleppo pine (Pinus halepensis Mill), the barabary Thuja (Tetraclinis articulata (Vahl) Master) and green Cypress (Cupressus sempervirens L.) are essential.

The entomological inventory was carried out from 2020 until 2023, three years of study.The different methods of capturing insects (collecting leafy branches, collecting cones, sight hunting, sweep net, Japanese umbrella, bark stripping, aerial trap, Barber trap, yellow bin) have allowed us to collect a significant number of species, and a large number remain unknown. These species are divided into 10 systematic orders, the most important of which are Coleoptera, Hymenoptera and Lepidoptera. Through this list of insects and according to their feeding habits, we have discerned 6 diets to which these species belong. The most representative are defoliators, auxiliaries and xylophages. This inventory allowed us to draw up a list of insects harmful to the coniferous species studied in the region. They total 30 species including 9 defoliators, 8 xylophagous, 7 conobiantes, 5 Opophagous and 1 gall-eating species. The auxiliaries are represented by 26 species.

 

Author (s) Details

 

Nichane Mohamed
Department of Agronomic Sciences, Institute of Sciences, Ahmed Salhi University Center, Naama, Algeria.

 

 Please see the book here:- https://doi.org/10.9734/bpi/crpbs/v10/4330