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Ciência e Agrotecnologia

Print version ISSN 1413-7054On-line version ISSN 1981-1829


BORTOLI, Sergio Antônio de; DORIA, Háyda Oliveira Souza; ALBERGARIA, Nuno Miguel Mendes Soares  and  BOTTI, Maurício Vladimir. Biological aspects and damage of Diatraea saccharalis (Lepidoptera: Pyralidae) in sorghum, under different doses of nitrogen and potassium. Ciênc. agrotec. [online]. 2005, vol.29, n.2, pp.267-273. ISSN 1413-7054.

This work was carried out to evaluate the influence of the fertilization of sorghum,   Sorghum bicolor (L.) Moench, on the stem borer Diatraea saccharalis (Fabr., 1794) (Lepidoptera: Pyralidae) biology. It was used the variety Rubi-Asgrow. The treatments were (NK doses): N1 = 0-200 ppm; N2 = 50-200 ppm; N3 = 100-200 ppm; N4 = 200-200 ppm; N5 = 400-200 ppm; K1 = 200-0 ppm; K2 = 200-50 ppm; K3 = 200-100 ppm; K4 = 200-200 ppm and K5 = 200-400 ppm. It was possible to conclude that nitrogen doses from 50 to 200 ppm provide a normal development for D. saccharalis larvae, although the lowest percentage of damage was verified with the lowest dose; while for the potassium, the highest dose favoured the caterpillars development, but less damage was observed on the plants.

Keywords : sugarcane borer; Sorghum bicolor; biology; insecta.

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