USO DE SILÍCIO DE PÓ DE ROCHA NO CONTROLE DA POPULAÇÃO DE Dalbulus maidis NO MILHO DOCE

Abstract

The corn leafhopper Daubulus maidis is an important pest that transmits the mollicute complex and in recent years has causing great damage to the sweet corn crop. Reseaechs have pointed to the use of diferent silicon sources such as rock dustin in the control of some sucking insects in vegetable crops, however their effect on D. maidis has not yet been evidenced. Thus, the present work aimed to evaluate different dosages of mica schist rock dust in the D. maidis control in sweet corn. The experimente was carried out under field conditions in the agricultural area of ILES/ULBRA located inthe municipality of Itumbiara-GO. The area was prepared with one plowing and two harrowing, with the planting of the experiment carried out 41 days after soil preparation on 12/27/2021. The treatments evaluated consisted of different doses of rock dust at 4 ton./ha, 6 ton./ha, 8 ton./ha, 10 ton./ha, in addition to the control which was not applied rock. Each experimental plot had 12m2, 4 meters long and 3 meters wide, totaling 40 experimental plots. The parameters population density of the leafhopper, number of plants with symptoms of virus and stunting, assimilation of silicon in the plant and biosolubilization of silicon in the soil were evaluated. The treatments with rock dust showed no significant difference for D. maidis population fluctuation, in the bioaccumulation of silicon by the plant and in the soil biosolubilization. As for the mollicutes complex transmission, there was a significant influence between the different treatments. Keywords: MIP, leafhopper, virus, mollicutes, Zea mays.