Efeitos do inseticida thiamethoxam no desenvolvimento, na produtividade da cana-de-açúcar e no controle de Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae)
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Data
2008-02-15
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Universidade Federal de Goiás
Resumo
The objective of the present work was to determine the physiologic effects of
thiamethoxam in sugarcane crop. This study was conducted at Escola de Agronomia e
Engenharia de Alimentos of Universidade Federal de Goiás , in Goiânia, and at
commercial areas and seedlings of nursery of Usina Jalles Machado S/A , in Goianésia,
Goiás State, Brazil, in period from December of 2006 to November of 2007. Three
experiments were conducted, being one without and two with the presence of root
froghopper Mahanarva fimbriolata. In these experiments, thiamethoxam was used in the
doses 0 g of active ingredient (i.a.).ha-1, 100 g i.a.ha-1, 150 g i.a.ha-1e 200 g i.a.ha-1, with
application accomplished in December end, being evaluated the number of nymphs of
January to May, and in the crop, the yield and technological parameters. To evaluate the
thiamethoxam effect in the initial development of the plants two experiments they were
led: one in acrylic boxes (3,5 x 11 x 11 cm) with substrate and other in tubes of PVC (0,20
x 1,20 m) with soil. In the first the variety was used RB867515, with the same doses of the
field experiments, being evaluated development of the above-ground part and roots, third
days after the application of the insecticide. In tubes, conducted the experiment in factorial
scheme, with two varieties (RB867515 and SP80-1816) and six doses (0 g, 50 g, 100 g,
150g, 200 g and 250 g i.a.ha-1), being evaluated the parameters, tillers number, height,
diameter of stem, length of the roots, shoot and root dry matter mass, 130 days after the
application of the insecticide. In the field experiments, all the thiamethoxam doses were
efficient in the population reduction of M. fimbriolata, not differing statistical between
itself. The thiamethoxam application made possible increment in the agricultural
productivity of 7,98 t.ha-1, with increase in the industrial revenue. The technological
parameters were not influenced by the thiamethoxam application. In acrylic boxes there
was increment of up to 3,7 times in the mass it evaporates of the roots in treated seedlings
with thiamethoxam. In tubes of PVC, effect of thiamethoxam doses was observed in the
increase of the diameter and dry weight of roots.
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Citação
PEREIRA, Jaqueline Magalhães. Effect of thiamethoxam insecticide in development, yield of
sugarcane and control of Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae). 2008. 61 f. Dissertação (Mestrado em Ciências Agrárias) - Universidade Federal de Goiás, Goiânia, 2008.