Scholarship 19/25210-4 - Acarologia, Nutrição vegetal - BV FAPESP
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Resistance induced in soybean to twospotted spider mite Tetranychus urticae (Acari: Tetranychidae) by boron associated with inositol

Grant number: 19/25210-4
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Start date until: March 01, 2020
End date until: April 30, 2021
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal Investigator:Daniel Júnior de Andrade
Grantee:Bruno de Miranda Alves Ferreira
Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

The twospotted mite Tetranychus urticae stands out in soybean crop due to the high damage caused and the difficulties in control, mainly due to the rapid evolution of resistance to acaricides. The use of boron (B) in soybean cultivation can be an important tool, as this element is related to the increase of cell wall stiffness, which can make the feeding of phytophagous mites difficult. The objective of this project will be to verify if there is resistance induction in soybean plants to twospotted mite after boron applications associated with inositol polyol. Inositol will be used to increase the mobility of boron in the plant. The experiment will be installed in a completely randomized design in a 2 x 2 + 1 factorial scheme, using as soil Quartzipsamment considered low in boron. The first factor will be composed of two application periods via boron fertirrigation as a function of plant phenology, in which one application will be performed in V4 and another in R1. The second factor will consist of the application of boron with and without the addition of inositol. An additional treatment without boron application will be employed as a control. In R3 all plants will be infested with mites T. urticae. Using leaves will be performed analyzes of hardness, quantification of boron, phenolic compounds and extravasation index. Between R7 and R8, the mite population per plant will be quantified and then the instantaneous population growth rate will be calculated. The dry matter of plant shoots will also be determined. With the results of this project, it is expected to elucidate the response of T. urticae maintained on boron treated plants. If boron negatively affects the population growth of this species, the use of this element may be considered as a complementary tactic in Integrated Pest Management.

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