Abstract

The study of cork oak decline to protect the cork oak and is to assess the health status of the population of cork oak through dendrometric surveys and exploitation, as well as consideration of barter, crown, leaves and acorns. Our study was conducted at the forest Edough (Seraidi) on two sites; surveys show a slight defoliation with a normal color.

The calculation of the decay index (ID) indicates the beginning of decay. The examination of the trunk indicates a significant presence of wood-boring insects and flora lichénologique at two sites. Oozing blackish carbonaceous crusts, cracks and déhissances cork are also observed. Examination of leaves indicates a strong effect of insect defoliators affecting mainly the leaf stripper. The insect attack, necrosis and galls are observed mainly on small sheets.

We determined the different biometric acorns as length, diameter and weight of different batches of cork oak acorns from different. We showed that acorns attacked by the procession of budworms have a length and a diameter and a weight lower than healthy acorns. Acorns on trees studied were strongly attacked by moth Cydia splendana and beetle Curculio sp.

To fight against pests and in order to preserve the cork oak acorns, we tested the efficacy of two doses of spinosad: 1g / l and 500mg / l. We have shown that the acorns of cork oak control and treated a 500mg / l and 1 g / l placed in germination conditions present almost the same rate of germination we showed in our study that the effect of treatment is reflected in germination since observed the same results for both lots. We have shown that the growth and development of the same witnesses’ acorns are slower than acorns treated.

They present fewer stems, fewer leaves and also a size less developed.

Information

Item Type:	Thesis
Divisions:
ePrint ID:	262
Date Deposited:	2015-01-07
Further Information:	Google Scholar
URI:	https://www.univ-soukahras.dz/en/publication/article/262

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