Abstract
ABSTRACT The strawberry is susceptible to several pests which cause a reduction in productivity. The use of mechanisms which repel or prevent these pests to establish, represent a sustainable environmental technology to reduce the frequency of agrochemical use. In this context, the aim of this study was to evaluate the effect of salicylic acid (SA) on resistance induction against two-spotted spider mite in strawberry cultivars (Aromas and Sweet Charlie). Five concentrations of SA (0, 25, 50, 75 and 100 mg L-1) were tested in order to verify the antixenosis effects. In SA concentration of 50 mg L-1, a reduced number of mites in the two strawberry cultivars was noticed. For the number of eggs deposited on leaflet, we verified an effect of SA concentration with quadratic adjustment in the equation. Sweet Charlie cultivar was more effective than Aromas in relation to the reduction of mite oviposition on leaflets treated with SA. SA concentrations of 25, 50 and 75 mg L-1 were the most efficient for the evaluated traits allowed to infer its potential as antixenotic resistance inducer against two-spotted spider mite in strawberry crop.
Highlights
O morangueiro é atacado por diversas pragas que ocasionam redução na produtividade
The authors verified that the two-spotted spider mite showed a preference for moving towards the strawberry cultivars without salicylic acid (SA) application (Figure 1), showing antixenosis type resistance
Concentrations of 25, 50 and 75 mg L-1 were the most effective in repelling the two-spotted spider mite movement (Table 1). This effect can be attributed to the resistance mechanism which manifests so that the plant survives the attack by herbivores, considering this defense mechanism called Systemic Acquired Resistance (SAR) (Van Loon et al, 1998)
Summary
O morangueiro é atacado por diversas pragas que ocasionam redução na produtividade. Mecanismos que repelem ou evitam que essas pragas se estabeleçam representam uma tecnologia ambientalmente correta e sustentável, para reduzir a frequência no uso de agroquímicos. Objetivou-se avaliar o efeito do ácido salicílico (AS) na indução de resistência ao ácaro-rajado (Tetranychus urticae), nas cultivares de morangueiro Aromas e Sweet Charlie. A cultivar Sweet Charlie foi mais efetiva que a Aromas na redução da oviposição dos ácaros sobre os folíolos tratados com AS. SA acts as a regulator in biological processes in plants, including defense (Kumar et al, 2015) It acts on the accumulation of superoxide and hydrogen peroxide in the apoplast, causing cell death at infection site, promoting lignin synthesis in the cell wall, making it difficult stylet penetration and chewing of insects, due to cell wall stiffening (Datnoff et al, 1991; Epstein, 1994; Marschner, 1995), acting in the establishment of systemic acquired resistance (Gao et al, 2015). This study aims to contribute to better understanding the role of this elicitor in the repellency of plants against spider mite attack on strawberry, evaluating concentrations of SA as inducer of resistance to T. urticae in two strawberry cultivars
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