Étude des thrips des spéculations maraichères de la commune Dhayet Ben Dahoua (Ghardaïa, Algérie)

Abstract

The diversity of Thrips of Algeria is little known, mainly because studies are limited, The number of species inventoried in Algeria will probably increase in the future if studies are oriented towards this group of Insect. Algeria is a great center of unexplored diversity, integrating various geographical regions, Nevertheless the knowledge of this diversity remains very limited. The objective of our research is to carry out an inventory that will help us improve the knowledge of this group of insects on different agricultural speculations in the Ghardaïa region. First of all, we carried out an inventory of thrips on different crops in a few localities in the Ghardaïa region. The thrips were sampled using traps suitable for the different crops. During our study, when three species of thrips are identified, we found that the suborder Terebrantia is represented by the family Thripidae, which has 19 species, or 57.5% of the total. We have noted five species for the Aelothripidae family (15.15%), four species for the Melanthripidea family (12.2% of the total). The suborder of the Tubulifera is represented only by a family of the Phlaeothripidae represented by the genus Haplothrips.et the Balothrips kind. We counted five species (15.15%) for this family. The Thripidae family shelters the most phytophagous species, of economic interest, such as Frankliniella occidentalis and Thrips tabaci. In a second step, we studied the development of Tobacco Thrips on onion and garlic. We have noticed a big difference between the two cultures regarding the cycle of this species. An initial period of development of T. tabaci was noted in January when the number of Tobacco Thrips is very reduced. A second period is observed in early March, an increase in the number of Thrips is observed. A third intensive period begins in mid-March: The start of the tobacco thrips population is quite long on onion, unlike garlic.