Trioza apicalis

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Trioza apicalis (click on image to enlarge it)
Author: Lars-Arne Høgetveit, Norsk Landbruksrådgiving Viken

Trioza apicalis Förster, 1848 - (carrot psyllid)

This psyllid is an important pest of carrots, especially in northern Europe. Infestations can result in total crop losses. The symptoms caused by the psyllid include leaf curling, yellowish and purplish discoloration of the leaves, stunting as well as smaller, deformed and tougher carrots. The psyllid is associated with haplotype C of "Candidatus Liberibacter solanacearum" and apparently transmits this bacterial disease to carrots. A survey in the carrot growing areas of Norway found up to half of all psyllids carrying the disease in some areas (Munyaneza et al., 2014).

In autumn, the adults migrate to conifers, especially Norway spruce, for overwintering. However, psyllid populations also exist in areas without conifer forests. They move back to carrots in spring where they lay eggs and breed.

Vernacular names
• Deutsch: Grüner Möhrenblattfloh
• English: carrot psyllid
• Español: psila de la zanahoria
• Français: psylle de la carotte

The adults are 3-4 mm long, greenish brown with a bright green abdomen. Management is difficult. There are currently no effective insecticides available for control. Covering the plants with insect netting protects the carrots but causes other problems.

For a review see Láska, 2011.