English names: Serpentine Leaf Miner, Pea Leaf Miner, South American Leaf Miner
Nordic names: Ærteminérfluen (DK), Krysanteemin suonimiinaajakärpänen (FI), Søramerikansk minérflue (NO), Amerikansk minerfluga (SE)
Major host plants
Plants belonging to 14 families has been recorded as hosts, including both vegetables and ornamentals.
Feeding punctures appear as white speckles, between 0.13 and 0.15 mm in diameter. Oviposition punctures are smaller (0.05 mm) and are more uniformly round. Mines are usually white with dampened black and dried brown areas. They are typically serpentine, tightly coiled and of irregular shape, increasing in width as larvae mature. Larvae deposit excrements in a line, inside the mines.
A map can be downloaded from EPPO's website. See instructions here.
Female puncture the leaves causing wounds which serve as sites for feeding or oviposition. Eggs are inserted just below the leaf surface. Eggs hatch in 2-5 days. The duration of larval development is generally 4-7 days. L. huidobrensis pupariates within the leaf or just outside the mine. Other Liriomyza species usually pupariate externally, either on the foliage or in the soil just beneath the surface. Adult emergence occurs 7-14 days after pupariation.
Adult flies are capable of limited flight. Dispersal over long distances by transport of infested planting material of host species. Cut flowers can also present a danger as a means of dispersal.
Detection and inspection
At early stage of infestation the egg laying and feeding punctures can be seen on leave surfaces. The leaf mines are easy to recognize. Insect colonisation usually begins from lower parts of plants. The use of sticky traps, especially yellow ones, placed near host plants is a very effective method of collection and estimation of infestation. All Liriomyza species are similar and may be mistaken for each other on quick examination. Therefore, accurate identification requires laboratory examination.
Pest status and importance
Larval damage reduces the photosynthetic ability of the plants. In young plants and seedlings, mining may cause considerable delay in plant development leading to plant loss. It is considered to be a more serious pest than L. trifolii.
Source of information
See further information here:
Author: Christiane Scheel
Editor: Elise T. Yamamoto Buch