Résumé:
Tuta absoluta (Meyrick, 1917) is an insect pest of crops whose larvae are capable of
causing extensive damage to infested plants, causing losses of up to 100% of the crop. Its host,
mainly a Solanaceae, can be tomatoes, potatoes and even some wild species. This
microlepidopteran from South America quickly spread to today infest the entire Mediterranean
basin. It is in this context and for these reasons that we have made our contribution to the study
of thebioecology and population dynamics of T. absoluta by laboratory and greenhouse
observations and pheromone trapping in the field. efficacy testing of two isectecide treatments
against this leafminer.
In the laboratory, this study allowed us to study some biological parameters of T. absoluta
by comparing the development durations of the different stages of insect development as well
as the mortality rates of each life-history stage. two active substances (The study of the
dynamics of the populations highlighted the succession of four phynological stages during the
study period from December to March, the first damage appeared at the first places at the level
of the nursery. also observed in all vegetative stages of the crop, and as the frequency of attack
of the crop increased, the damage became visible on the plants and fruits.
Finally, we confirmed the effectiveness of two basic formulation of different active
ingredients of insecticides (proacte and abamictine) on the larval populations of tomato
leafminer Tuta absoluta. Statistical analyzes show that the 1.5ml / 2l dose forms only one group
with a mean of the leaf blasses two days after the application of both treatment and another
group with 53.61% after four days We suggest the combination of efforts of researchers to find
reasonable solutions to this important pest that threatens agriculture; further work will
undoubtedly address these concerns.
