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.