Grass Thrips – Haplothrips aculeatus

Haplothrips aculeatus

Haplothrips aculeatus


In Europe, the species is known from the steppe areas up to the mountains. It is frequently found on cereals, but it obviously prefers rye.


Its body is black, 2 mm long, males being smaller than females. The egg is ovoidal and translucid, and the larvae are orange-red, 1.8 mm long. The pupa is the same color as the larva and it is 1.7 mm long.

Haplothrips aculeatus - adult

Biology and ecology:

It forms one generation per year and overwinters as an adult in the vegetal residues of the attacked plants. The adults and larva populate the cover of the last leaf, they lay eggs and feed with the ear organs, with the flowers and young grains. The development of one generation from egg-laying takes 50-56 days.

Haplothrips aculeatus - adults

Attacked plants and damage:

Species found on numerous host plants, spontaneous or cultivated plants (foxtail, oat, rush, Lucerne, dense flower mullein, green sward, wheat, rye, clover, corn etc.).

Haplothrips aculeatus - affected plant

Haplothrips aculeatus - affected plant 1

Prevention and control

Deep ploughing of 20-25 cm ensures the disappearance of 90% of the larvae which are incorporated with the vegetal residues in the soil.

Chemical treatments with different endorsed products such as Actara (0.02%), Biscaya 240 OD (0.16 l/ha), Faster 10 CE (0.15 l/ha), Fury 10 CE (0.1 l/ha), Kaiso Sorbie 5 WG (0.15 kg/ha) etc.

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