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The olive fly is the main pest of the olive tree; it causes qualitative and quantitative damage. The aims of this study were to determine the chemical composition of the essential oil of Pinus halepensis Mill. and to evaluate the insecticidal activity against Bactrocera Oleae adults. The composition of the essential oil extracted by hydrodistillation from needles of Pinus halepensis collected at Guezoul Mountain Tiaret Algeria in February 2018, was characterized by gas chromatography- mass spectrometry (GC/MS). The insecticidal effects of essential oil inhalation on Bactrocera Oleae adults were investigated. The breeding of the flies was carried out at the plant protection laboratory at the University of Ibn Khaldoun Tiaret Algeria. Hydrodistillation of the needles of Pinus halepensis gave 0.2 % oil yield on a dry weight basis. The analysis of the essential oil allowed to identify 40 components, mainly sesquiterpene hydrocarbons (36.1%), monoterpene hydrocarbons (22.2%) and diterpenes (6%). The major constituents were caryophyllene (35.3%) and α-pinene (14.93%), While propanoic acid, 2,2-dimethyl-, 2-phenylethyl ester (7.93%), α-caryophyllene (7.69%), caryophyllene oxide (5.51%) and cubeben (3.29%) are minor compounds. The essential oil of Pinus halepensis has proven to be biocidal against adults of Bactrocera oleae, Mortality of 100% of the population is noted with a dose of 20 μl/0.5 L of the area after 36 hours of essential oil inhalation. These results indicated that of Pinus halepensis essential oil has high chemical diversity and great potential to be developed into more effective and environmentally friendly anti-insect agents. [ABSTRACT FROM AUTHOR]

This study tries to apply three plant extracts to protect potato tubers during storage periods, against attacks of the potato tuber moth (Phthorimaea operculella). Bioassays were used to determine the effect of the three selected plants extracts, Ammoides verticillata, Phlomis crinita and Reseda alba, at different concentrations: 0.5%, 1%, 1.5% and 2%. The different biological features and the damage index of potato tubers have been evaluated. In the tuber dipping method, the highest mortality (100%) occurred at the concentration of 2% for the aqueous extract of Ammoides verticillata with (zero) damage index. On the other hand, in the larva dipping method, by the extracts Ammoides verticillata and Reseda alba, the results showed total larval mortality at the highest concentrations, whereas they caused total inhibition of egg hatching at 1% concentration. [ABSTRACT FROM AUTHOR]

A faunistic inventory of Hymenoptera Braconidae from two olive orchards in Tiaret province (Algeria) is contributed. These insects were collected by Barber pots and yellow plates methods from December 2018 to November 2019. A total of 13 species of Braconidae from 9 genera and 7 subfamilies are listed. Nine taxa are new record to the Algeria entomofauna: Aspilota sp, Aphidius absinthii, Aphidius setiger, Bracon intercessor, Bracon variator, Chelonus planiventris, Homolobus pulchricornis, Glyptapanteles sp. and Opius sp. This inventory provides a preliminary database on Braconid diversity in a semi-arid habitat. [ABSTRACT FROM AUTHOR]