The wheat thrips (Haplothrips tritici) – pest management
The wheat thrips, Haplothrips tritici is a species reported in the late nineteenth century in the former Soviet Union and it is widespread in Europe, Africa, and Asia.
Description. The adult has a body that is 1.2-1.5 mm long, with hues from dark brown to black, the wings being narrow with one rib. The larva is orange-red, but the head, legs, and last abdominal segment are black.
Biology and ecology. The wheat thrips is a univoltine species, which produces one generation per year, developing from May to June-July of the following year, of which about 57 days are spent on the host plant and the remaining 309 in the soil. The female lays 20-22 eggs. The primary larvae appear in May-June on inflorescences, and the secondary ones after another 2-4 days. The larval density can be 10-70 specimens/spike, and the lifespan is 20-30 days.
Attacked plants and damages. The spike can be partially or completely destroyed, as the attack is manifested on the spike’s root (radial attack) or on the inflorescences (floral attack). The affected organs display withering, yellowing, or whitening, followed by changes in shape. The attack is stronger if the monitoring takes place later or it lasts much longer than normal and can cause the phenomenon known as whitening of the spikes (total or partial).
Control: The deep plowing at 20-25 cm ensures the destruction of 90% of the larvae that are hidden with the vegetal remains in the soil. Chemical treatments should be carried out with various approved products such as:
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