Chemical pesticides and vegetal extracts on Sitophilus zeamais control in stored corn grains

Authors

  • Marcella Karoline Cardoso Vilarinho Universidade do Estado de Mato Grosso
  • Tonny José Araújo da Silva Universidade Federal de Mato Grosso
  • Carlos Caneppele Universidade Federal de Mato Grosso
  • Adriano Ferreira Rozado Universidade Federal de Mato Grosso

DOI:

https://doi.org/10.14393/BJ-v32n2a2016-26160

Keywords:

Insect, Temperature, Humidity, Sitophilus zeamais

Abstract

Sitophilus species are major pests of stored grain and their control is achieved mainly with the use of chemical insecticides, but the indiscriminate use of these products is resulting in several undesirable factors to man and to the environment. Thus, the use of natural insecticides comes as an option to control the insects, while lessening risks to the environment. The study was conducted at the Institute of Agricultural Sciences and Technologies, Rondonópolis campus of the Federal University of Mato Grosso, in the period from March to September 2012. The experiment was conducted under three different storing conditions. Aqueous extracts were obtained by the addition of Allium sativum L, Azadirachta indica A. Juss. and Cymbopogon winterianum Jowitt vegetable powders in distilled water, at a ratio of 5 g per 100 ml, and the levels of chemical insecticides were of 0.04 and 0.15 ml/100 ml of water for deltamethrin and chlorpyrifos, respectively. Treatments were added to the corn grains, which were placed in a 2.5 L glass container, mixed by manual shaking and infested with 20 adults of unsexed Sitophilus zeamais. Grains were stored for 60 days. At 30 and 60 days, the following items were analyzed: bugs count, water content in grains and electrical conductivity. The data were submitted to analysis of variance, and means were compared by Tukey test at 5% probability. At 30 days, the efficiency of chemical insecticides in the control of Sitophilus zeamais was observed in the three storage environments. Vegetal extracts were not effective in controlling insects. The larger number of insects increased the electrical conductivity and humidity values in the grains.

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Published

2016-04-04

How to Cite

CARDOSO VILARINHO, M.K., ARAÚJO DA SILVA, T.J., CANEPPELE, C. and FERREIRA ROZADO, A., 2016. Chemical pesticides and vegetal extracts on Sitophilus zeamais control in stored corn grains . Bioscience Journal [online], vol. 32, no. 2, pp. 288–297. [Accessed26 November 2022]. DOI 10.14393/BJ-v32n2a2016-26160. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/26160.

Issue

Section

Agricultural Sciences