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Integrated Management of the leaf miner fly Liriomyza huidobrensis

A brief description of the research area 

The leaf miner flies, Liriomyza spp. are regarded as among the most important pests of horticultural field crops in the tropics and subtropics. The genus Liriomyza is believed of Neotropic origin and was restricted to the New World until the mid 1970s. But since then, these species were rapidly spreading to other areas, and are presently reported in several countries of Latin America, Africa, Asia and the New World.

The most common species, L. sativae, L. trifolii and L. huidobrensis are characterized by their high degree of polyphagy and the extent to which they have invaded new geographic regions. L. huidobrensis is believed to have become a serious pest of potato in the central coast of Peru as a result of indiscriminate insecticide over-use against the potato tuber moth, Tuta absoluta. Since the 1980s, 10-13 sprays per season were used against leaf miner flies in potato with the consequence that in many places leaf miner flies are showing significant levels of resistance to all major classes of insecticides. Crop losses in South America due to leaf miner range from 30 to 50% despite the use of non-selective chemical applications.

To achieve the goal to reduce the amount of insecticide application, CIP?s scientists test and develop location-specific integrated pest management practices based on pest monitoring, host  plant resistance, use  of botanical  and selective  insecticides, and the use of  bioagents and  parasitoids, which  have  been found  to  be  effective  in  keeping  leaf* * miner fly populations at sub-economic levels. The  project  will  make  extensive  efforts  to fine-tune identified IPM practices and extend them to farm communities in multiple locations. To facilitate this process, the project provides participating national programs extensive training opportunities both in IPM applied research and extension in methodologies through Training of Trainers (TOT) and Farmer Field Schools (FFS).

Specific research areas and expected outputs:

  • Farmers? perception and strategies to control LMF understood and the economic importance of LMF and the needs for the development of IPM components in potato production systems in Peru, Bolivia and Ecuador determined.
  • Geographical distribution and population dynamics of LMF as influenced by abiotic (temperature, altitude) and biotic (parasitoids, hosts) factors assessed
  • The effective use of endemic parasitoids in biological control of LMF evaluated and methods of mass rearing developed.
  • The efficacy of selective and botanical insecticides (Sapindus saponaria) and of two strains of entomopathogenic fungus (Paecilomyces fumosoroseus) evaluated.
  • Participatory screening of LMF resistant potato clones in the coastal region of Peru and in Farmer Field Schools validated.

Agroecozone(s)/Location(s): Agro-ecologies in South America (highlands of Peru, Bolivia and Ecuador, coastal areas in Peru). 

Description of the pest :Liriomyza huidobrensis

Contact:

Dr. Jürgen Kroschel, j.kroschel@cgiar.org,

Norma Mujica, n.mujica@cgiar.org