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Diversity of the fungal flora associated with the white cochineal Parlatoria blanchardi Targ. (Himiptera-Diaspididae) in the palm groves of the Ouargla region, and determination of the pathogenicity of some fungal species

Hayet Benameur-Saggou, Amina Hassaine, Oum elkheir Abdelali, Chennouf Rekia, Keltoum Benbrahim, Samira Rebbouh

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Int. J. Biosci.20(3), 144-153, March 2022

DOI: http://dx.doi.org/10.12692/ijb/20.3.144-153

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Abstract

The inventory of fungi associated with the white cochineal is an essential step in the possible microbiological control of this pest. A total of 16 fungal species belonging to 11 genera were inventoried on white cochineal infesting four date palm cultivars, namely Deglet-Nour and Ghars, Degla beidha and Hamraya. The infection rate of cochineal by these fungi differs from one cultivar to another; it is 38.42% in Deglet-Nour and 29.88% in Ghars. The Aspergillus is the most dominant genus on white cochineal, with three species present in the four cultivars studied. Aspergillus niger has a frequency of occurrence of 21.28% on Ghars. The factorial correspondence analysis (FCA) showed specific fungal species for white cochineal in each cultivar. The pathogenicity test of 05 fungal isolates showed that Trichoderma sp. caused the highest rate cochineal mortality (63% ±1.69), followed by Aureobasidum pullulans with 49%±1.65. These encouraging results open up new perspectives in the biological control of this very dangerous date palm pest.

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Diversity of the fungal flora associated with the white cochineal Parlatoria blanchardi Targ. (Himiptera-Diaspididae) in the palm groves of the Ouargla region, and determination of the pathogenicity of some fungal species

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