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Idesia (Arica)

On-line version ISSN 0718-3429

Abstract

RIOJA, Tommy C; VARGAS, Héctor E  and  BOBADILLA, Dante E. BIOLOGY AND NATURAL ENEMIES OF PEREGRINUS MAIDIS (ASHMEAD) (HEMIPTERA: DELPHACIDAE) IN THE AZAPA VALLEY. Idesia [online]. 2006, vol.24, n.1, pp.41-48. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292006000100008.

The distribution of the corn delphacid, Peregrinus maidis, appears to be restricted in Chile to the coastal northernmost valleys, namely Lluta and Azapa. In order to know its life cycle and natural enemies under existing conditions in the local agroecosystem, a study was carried out during two phenological cycles of soft corn, Zea mays L. var. amylacea Sturtevant cv. Lluteño. The experimental crops were grown in the Campus of the Facultad de Agronomía, University of Tarapacá, km. 12 of Azapa valley. Planthopper female inserts its eggs in the young tissues around the central rib of the leaf. This delphacid undergoes five nymphal stadia during its ontogenetic development. The average duration of the nymphal instars was 10.05 ±1.28; 8.94 ±2.02; 9.94 ±1.03; 10.35 ±1.73; and 11.06 ± 2.30 days for the first through fifth instars, respectively. The adult life span was 62.1 ±14.13 days. It was proved that imagines exhibit wing dimorphism, being either macropterous or brachypterous morphotypes. In the corn biocoenosis of Azapa valley P. maidis is a strict monophagous species though adults were eventually collected on Setaria verticillata and Pitraea cuneato-ovata, two common weeds affecting corn crops here. The mostly observed natural enemies were Anagrus sp (Mymaridae), an oophagous parasitoid, and many other general predators such as spiders (Araneae), Nabis sp. (Nabidae), Chrysoperla sp. (Chrysopidae), and brown lacewings (Hemerobiidae).

Keywords : Zea mays L.; arid environments; Peregrinus maidis; ontogenetic cycle; Anagrus sp..

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