Abstract

SERRA, G. V.  and  TRUMPER, E. V.. Incidence of Diatraea saccharalis (Lepidoptera: Pyralidae) on corn crop yield and calculation of economic injury levels. Agriscientia [online]. 2020, vol.37, n.1, pp.63-63.  Epub June 01, 2020. ISSN 1668-298X.  http://dx.doi.org/10.31047/1668.298x.v37.n1.24402.

Diatraea saccharalis is a key pest of corn cultivation in the Pampas region of Argentina. The economic thresholds used are nominal and are not based on the current calculation of the economic injury level. The goals of this work were: to characterize the relationship between the infestation pressure of D. saccharalis and the yield of the corn crop and to calculate economic injury levels in different situations of crop development. A test was carried out with the hybrid DK696 with natural irrigation and infestation, following a split plot experimental deslgn with five sowing dates and different crop protection windows.The yield showed a linear relationship with the intensity of injury caused by D. saccharalis and this response was independent of the sowing date. Injury caused to the middle third of the plants showed the greatest ¡nfluence in the determination of yield, followed by the lower stratum, while damage to the upper stratum did not show a relationship with yield. Economic injury levels are proposed for different price scenarios.

Keywords : stem borer; Zea mays; damage function.

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