Flutuação populacional de Diatraea saccharalis (Fabricius, 1794) (Lepidoptera – Crambidae) em cana-de-açúcar no município de União-PI

Abstract

A broca da cana-de-açúcar, Diatraea saccharalis (Fabricius, 1794), (Lepidoptera: Crambidae), é a principal praga da cana-de-açúcar no Brasil. O objetivo deste trabalho foi avaliar a flutuação populacional de D. saccharalis em cana-de-açúcar e sua correlação com os fatores climáticos. As observações foram efetuadas na usina da Companhia Vale do Parnaíba (COMVAP), pertencente ao Grupo Olho D'água, localizado no município de União -PI. Foram avaliadas temperatura média do ar, temperatura máxima do ar, temperatura mínima do ar, umidade relativa do ar, vento, insolação, precipitação pluviométrica e pressão atmosférica durante o ano de 2007. Os dados meteorológicos foram submetidos à análise de correlação de Pearson (r). O pico populacional da broca ocorreu em junho e a análise dos dados mostrou que a temperatura mínima apresentou correlação negativa em relação ao número de adultos coletados (r= -0, 733, p= 0, 006) e a pressão atmosférica mostrou correlação positiva (r= 0, 6759, p= 0, 0158). Average air temperature, maximum air temperature, minimal air temperature, relative humidity, wind speed, insolation, pluviometric precipitation and atmospheric pressure were evaluated during the year 2007. The metereological data and the number of adults collected were submitted to Pearson's correlation analysis (r). The population peak of borer occurred in June and the analysis of the data showed that the minimum air temperature showed negative correlation to the number of adults collected (r=-0.733, p=0.006) and the atmospheric pressure showed a positive correlation (r=0.6759, p=0.0158). Palavras

Population Dynamics of Pests and Natural Enemies on Sugar Cane Grown in a Subtropical Region of Brazil

“…Diatraea saccharalis was quite abundant, and the increase in caterpillar population followed plant growth (internode number) of the crop throughout the season. This was reported also in sugar cane grown in the state of Piauí, in northeastern Brazil; however, those authors assessed adults cap-tured by light traps, and sugarcane borer adults were present throughout the developmental period of plants (Portela et al 2010).…”

Populational fluctuation of lace bug in cassava

“…It is important to point out that research with a population fluctuation of a pest and its relation with climatic factors present different results from one region to another, that is, the factor that presents a significant correlation in one region may not be relevant in another region, showing that the fluctuation population is specific to each site evaluated (PORTELA et al, 2010).…”

Performance of insecticides in control of Diatraea saccharalis (Lepidoptera: Crambidae) in sugarcane

“…An important factor in a region may not play the same role in another one. Thus, the pest population dynamic is specific of the crop growing place (PORTELA et al, 2010). Table 2 shows the final index of borer infestation.…”