Intensidade de infestação de Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: crambidae) na qualidade tecnológica de variedades de cana-de-açúcar, em Goiás

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2013-10-29

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Universidade Federal de Goiás

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The sugarcane borer Diatraea saccharalis Fabr. (Lepidoptera: Crambidae) is one of the most important pests of sugarcane in Brazil. The damages are occasioned by caterpillars that open galleries inside the stems causing death of a large number of tillers in young sugarcane plantations, and a sharp reduction of productivity in more developed sugarcane plantations. Another very common issue is the entrance of fungus that cause the “red rot”, which reduces the sugar level in the stems because of the saccharose inversion stored in the plant. The borer’s association with microorganisms in the field results in the borer rot complex, a disease, responsible for significant agro industrial losses. So, the goal of this thesis was to evaluate the effects of the intensity of infestation of Diatraea saccharalis in the technological quality of varieties of sugarcane in the State of Goias. The experiment was conducted in the town of Goianesia, GO at the plantation field of Jalles Machado Plant during the period of April 2011 to May 2012, where was applied irrigation system with 50% of hydric necessity of culture. The experimental delimitation used was randomized blocks with the treatment being formed by sixteen variety: CTC2, CTC4, CTC9, CTC11, CTC15, CTC18, IAC87-3396, IAC91 -1099, IACSP94-3046, IACSP94- 2094, IACSP94-2101, IACSP95-5000, RB857515, RB92579, RB966928 e SP86-0042. There were two experiments conducted to measure the intensity of infestation of Diatraea saccharalis. The experiment one was randomly conducted in each portion, while the experiment two consisted of sugarcane grouped as plants with borer attacks, and those without signs of borer attacks. Thereafter, there were separatly technological analyses for both kinds of experiments. According to the results, the types highlighted the most were CTC9, CTC15, CTC11 e IAC91 -1099, showing high levels of technological quality and productivity. For interaction type versus borer there was not significant difference through the test F, which means the borer effects is independent of the type analysed. For the types studied 10,7% of samples with borer internodes resulted in the lowering of technological quality of sugarcane, due to reduction of brix broth, brix sugarcane, pol broth, pol sugarcane and recoverable total sugar. For every 1% of borer internodes, a loss of 0,26% of sugars and 0,25% in ATR occurs. For the chemical control using the product ALTACOR® (Chlorantraniliprole 35%), the control level of sugar cane borer is 3,29% of intensity of infestation, against 1% if using the Cotesia flavipes.

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FERREIRA, C. A. S. Intensidade de infestação de Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: crambidae) na qualidade tecnológica de variedades de cana-de-açúcar, em Goiás. 2013. 80 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2013.