PROPOSTA DE MANEJO PARA O ÁCARO-RAJADO EM PLANTAS DE TOMATE PARA PROCESSAMENTO INDUSTRIAL, INCLUINDO A QUALIDADE PÓS-COLHEITA DOS FRUTOS

Abstract

The two-spotted mite, Tetranychus urticae, has been identified as one of the main pests of tomato plants for industrial processing in the central region of Brazil, especially in Goiás state, Brazil. Some control options for this pest are difficult to adopt as a management strategy due to the larger planting areas during the driest time of the year. Therefore, the chemical control method is still the one with the best operational and efficiency against mites in open field environments. In this sense, the objective of the present study was to evaluate the two-spotted mite population on tomato plants and post-harvest parameters in plots treated with different types of chemical products, including plinazolin® Technology in two doses through the commercial mixture between an avermectin (emamectin bensoate) and an isoxazoline (isocycloseram). The experimental design was performed by randomized blocks with eight treatments and four replications. The treatments were: (T1) absolute control (water only), (T2) plinazolin + emamectin benzoate at a dose of 150 ml ha-1, (T3) plinazolin + emamectin benzoate at a dose of 200 ml ha-1, (T4) lufenuron + emamectin benzoate, (T5) spinetoram, (T6) chlorfenapyr, (T7) indoxacarb and (T8) cyantraniliprole + abamectin. The mite population was counted per leaf and leaflet at 107, 114, 121 and 128 days after transplanting (DAT). And the parameters Brix degree, pH and color of the fruits at the harvest stage. The plinazolin 200 treatment reduced the estimated average number of mites per leaflet from 9.18 to 3.20. In plinazolin 150 this reduction was to 4.68. Both of these treatments maintained the mite population below the estimated average value for the longest period of time observed (75%). The highest Brix observed was for fruits from plots treated with plinazolin 200. The highest pH values were observed in the treatments plinazolin 150, spinetoram and cyantraniliprole++. For the color scale, the plinazolin 200 treatment also presented the highest value compared to the other treatments. With these results, we present a promising alternative, based on the chemical control method, for the management of two-spotted mites incident on tomato plants for industrial processing.

Keywords: leaflets, insecticides, isocicloseram, Tetranychus urticae, Solanum lycopersicum, Solanaceae.