Resistance induction in wheat plants by silicon and aphids

  • Flávia Batista Gomes UFLA
  • Jair Campos de Moraes UFLA; Depto. de Entomologia
  • Custódio Donizete dos Santos UFLA; Depto. de Química
  • Márcio Marcos Goussain UFLA
Keywords: Schizaphis graminum, Triticum aestivum, pest management, induced resistance, host plant resistance

Abstract

The pest greenbug Schizaphis graminum (Rondani) (Hemiptera: Aphididae) stands out among the factors limiting Brazilian wheat production. Chemical control is predominant in aphid management making the production dependent on insecticides. The effect of silicon and previous infestation with aphids on the induction of resistance to the greenbug was evaluated in wheat plants. Treatments consisted of control; fertilization with calcium silicate; plant infestation with aphids; fertilization with calcium silicate + plant infestation with aphids. A free-choice preference test was performed 35 days after seedling emergence; the aphid's intrinsic rate of population increase (r m) was also determined, and the activities of three enzymes (peroxidase, polyphenoloxidase, and phenylalanine ammonia-lyase) involved in plant defense were quantified. Silicon fertilization and the previous infestation with aphids induced wheat plant resistance to the greenbug.

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Published
2005-12-01
How to Cite
Gomes, F., Moraes, J., Santos, C., & Goussain, M. (2005). Resistance induction in wheat plants by silicon and aphids . Scientia Agricola, 62(6), 547-551. https://doi.org/10.1590/S0103-90162005000600006
Section
Entomology