Medfly females lay their eggs inside many different fruit and vegetable crops, including oranges. When the eggs hatch, small Medfly worms begin eating inside the fruit. In order to keep Spain’s oranges free from these worms, growers have to spray.
“The Mediterranean fruit fly is one of the most destructive pests of fruit in the world, attacking >250 species of fruits and vegetables. In Spain, this fly is considered one of the most economically damaging pests of citrus orchards. Direct losses result from the oviposition in fruits, larval activity, and eventual infection by fungi. In addition, quarantine measures are required for exportation to fly-free areas.”
(2)”The Mediterranean fruit fly is one of the most serious pests affecting cultivated plants in the world… Its life strategy includes changes of host species throughout the year, because larvae develop inside fruits only when they are mature.
Eastern Spain has a heterogeneous fruit growing area which extends all along the coast of Iberian Peninsula, from north to south… The most important damage to citrus fruits is produced between September and November, when satsuma and clementine mandarins reach maturity and suffer heavy attacks. Traditional control methods for reducing medfly populations and damage in citrus groves rely on the use of chemical sprays applied to fruits near harvest.”
Authors: C. Magaña, P. Hernández-Crespo, F. Ortego and P. Castañera
Affiliation: Departamento de Biología de Plantas, Centro de Investigaciones Biológicas, CSIC, Madrid, Spain
Title: Resistance to malathion in field populations of Ceratitis capitata.
Publication: Journal of Economic Entomology. 2007. 100(6):1836-1843.
Authors: Martinez-Ferrer M.T., et al.
Affiliation: IRTA Amposta. Ctra. de Balada, km. 1. 43870 Amposta (Tarragona). Spain.
Title: Seasonal and annual trends in field populations of Mediterranean fruit fly, Ceratitis capitata, in Mediterranean citrus groves: comparison of two geographic areas in eastern Spain.
Publication: Spanish Journal of Agricultural Research. 2010. 8(3):757-765.