INFESTAÇÃO DE DIATRAEA spp. EM DIFERENTES VARIEDADES DE CANA-DE-AÇÚCAR EM UNIÃO - PI
2011
GILSON LAGES FORTES PORTELA | LUIZ EVALDO DE MOURA PÁDUA | ROMMEL TITO PINHEIRO CASTELO BRANCO | OCIMAR DE ALENCAR BARBOSA | PAULO ROBERTO RAMALHO SILVA
The bit of cane sugar, Diatraea saccharalis (Fabricius, 1794), (Lepidoptera: Crambidae), is the main plague of sugar cane in Brazil. The objective of this study was to evaluate the intensity of infestation in five varieties of commercially sugar cane. The experiment was conducted at Parnaíba Valley Company (COMVAP), that belongs to the Olho D'água Group, located in the city of União - Pi (latitude 04° 51' 08" S; longitude 42° 52' 59" W). Gallo methodology was used to evaluate the the intensity of infestation. It is calculated by: II% = 100 x blocked internodes / total number of internodes. The intensity of infestation of all sorts was considered very low. The varieties SP73-2577, SP83-2847, SP81-3250, SP79-1011 and RB92-579 did not present infestation, using the no-parametric test of Kruskal - Wallis, meaningful statistic differences among them. All varieties showed similar intensity of infestation and may be recommended respecting other desired characteristics.
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