Observaciones sobre la fertilidad diferencial de dos morfotipos alares en peregrinus maidis (Ashmead) (Hemiptera: Delphacidae) en condiciones de laboratorio

Under agroecological conditions of the Arica valleys, Region of Arica y Parinacota, Chile, the planthopper or corn delphacid, Peregrinus maidis (Ashmead), behavior as strict monophagous, colonizing amylaceous cornfields, Zea mays L. var. Amylacea, and sweet corn, Z. mays L. var. Saccharata. Both corn types are cultivated during all year to consume fresh product (ear of corn), and P. maidis colonization are achieved with the existence of two alar morphotypes, i. e. macropterous forms to colonization, and brachypterous forms in charges to make up increase the local population. Field station observations, with measurements done in microcages, and laboratory specimen, allowed establish that female macropterous forms presented a larger preoviposition (17.8 ± 1.2 days) that brachypterous forms (12 ± 1.1 days). Besides, its last showed a larger oviposition period (20.7 ± 6.7 days) that macropterous females (8.7 ± 1.5 days). Also, the brachypterous females deposited on average a bigger number of eggs (157.8) than those macropterous females (49.7). This records were analyzed through the t of Student test; it found that for three parameters previously indicated the estadistical differences between both alar morphotypes are very significant (P ≤ 0.001). These differences have relation with each morphotype roll in the dispersion, colonization and exploitation of alimentary resource.