Abstract
The work consists of a study on the level of infestation of the 3 species of olive-infused mealybugs at the two stations (Soumaa and Guerrouaou) in the Blida région, with particular attention to the évolution of Pollinia pollini (Asterolecanidae), Octaspidiotus nerii (Diaspididae) and Saissetia oleae (Lecanidae). Unlike the Soumaa station, there is a large infestation in the Guerrouaou station by the three (most abundant) species with a high rate. The life cycle monitoring and the bio-ecology of these three pests were carried out through periodic population counts on the leaves and twigs of the tree from 08 August 2016 to 29 May 2017 in the wilaya of Blida. It appears that the study of the biology of P.pollini evolves in 2 annual generations (the first is the spring generation; the second is through the summer. The larval stage remains the most abandoned compared to other developmental stages. The South orientation seems the most affectionate by P.pollini. We can conclude that O .nerii has two generations « spring and automne » depending on climatic factors. The East and West exposure represent the places most sought after by this scale where we found a relative abundance between larvae and adult females. S. oleae develops only one generation per year (automnal génération). Females are the most abundant in Soumaa station and larvae in Guerrouaou station. The eastern orientation and the automne season are the most favourable for the development of the mealybug.
Highlights
Algeria is one of the main Mediterranean countries with a more favourable climate for olive growing
Our work was focused on the level of infestation within the two experimental stations where we found 5 species of Homoptera subservient to the olive tree in the région of Blida by treating the population dynamics of the 3 main cochineals (Pollinia pollini, Octaspidiotus nerii, Saissetia oleae), through observation of twigs and leaves
We can deduce that P. pollini is a heliophilic species, specific to the olive tree and which overwinters at the young female and adult female stage
Summary
Algeria is one of the main Mediterranean countries with a more favourable climate for olive growing. Scale insects 0are recognized as primary or secondary pests on many crops. The Asterolecanid family includes scales that usually secrete a very difficult follicle to separate from the insect’s body. This group of insects is represented by the genus Pollinia (silvestri, 1920). In Tunisia, it is considered the most important pest of the maritime regions after the olive fly, Batrocera oleae (damiano, 1963). It was introduced in California in 1980 and in Argentina in 1984 with olive plants. Stages of development according to arambourg (1986); Egg: White, almost spherical oval in shape and becomes more elliptic when the larva is formed
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