DEVELOPMENT OF Tetranychus urticae KOCH (ACARI: TETRANYCHIDAE) IN DIFFERENT STRAWBERRY CULTIVARS

Abstract

-two-spotted spider mite, Tetranychus urticae Koch, is considered the main pest in strawberry crop. The control of this species is hampered by the low efficiency of products currently used, occurrence of populations resistant to acaricides and high reproductive potential of this pest. this leads to the use of pesticides and increased agrochemical residues in fruits. the use of resistant cultivars is considered the ideal control method because they maintain mite populations below levels of economic damage, minimize the environmental impact of pesticides at no extra cost to the farmer, and serve as an auxiliary tool in integrated pest management. In this sense, this study evaluated the resistance of strawberry cultivars to T. urticae by studying the development of its biological aspects. comparative biology experiments and non-preference tests for feeding and oviposition for spider mite were carried out in 16 strawberry cultivars under laboratory conditions. Based on results, it was found that camarosa, Florida Festival, IAc campinas and Sabrosa strawberry cultivars indicated the possibility of antibiosis type resistance to spider mite, influencing the preference to food, development and oviposition, indicating the existence of differentiated reaction in population development among cultivars. Index terms: two-spotted spider mite, comparative biology, antixenosis. DESENVOLVIMENTO DE Tetranychus urticae KOCH (ACARI: TETRANYCHIDAE) EM DIFRENTES CULTIVARES DE MORANGUEIRORESUMO -O ácaro-rajado, Tetranychus urticae Koch, é considerado a principal praga da cultura do morangueiro. O controle desta espécie é dificultado pela baixa eficiência dos produtos atualmente empregados, pela ocorrência de populações resistentes a acaricidas e ao alto potencial reprodutivo dessa praga. Isso induz ao uso de agrotóxicos e ao aumento de resíduos de agroquímicos na fruta. O emprego de cultivares resistentes é um método de controle considerado ideal, pois permite a manutenção do ácaro em níveis inferiores aos de dano econômico, minimiza o impacto ambiental dos agrotóxicos, sem ônus adicional ao agricultor, e serve como ferramenta auxiliar no manejo integrado da praga. Nesse sentido, o trabalho avaliou a resistência de cultivares de morangueiro a T. urticae através do estudo do desenvolvimento de seus aspectos biológicos. Experimentos de biologia comparada, testes de não preferência à alimentação e a oviposição para o ácaro-rajado foram conduzidos em 16 cultivares de morangueiro em condições de laboratório. A partir dos estudos, constatou-se que as cultivares camarosa, Florida Festival, IAc campinas e Sabrosa indicaram a possibilidade da existência de resistência do tipo antibiose para o ácaro-rajado, influenciando na preferência à alimentação, desenvolvimento e oviposição, indicando a existência de reação diferenciada entre as cultivares estudadas. Termos para indexação: ácaro-rajado, biologia comparada, antixenose.

Strawberry genotypes with resistance to Tetranychus urticae mediated by leaf trichomes

“…In the present work, the density of trichomes in 'Camarosa' was higher than that observed in 'Albion', and it can be inferred that this characteristic can be highly influenced by the environment. However, Karlec et al (2017) reported that the Camarosa cultivar may exhibit antibiosis-type resistance to the two-spotted mite, whose preferences regarding feeding, development and oviposition differed from the results obtained in this research.…”

“…The obtained results indicated that there was an influence of the preselected hybrids and cultivars on the behavior of the spider mites, allowing us to verify the existence of superior genotypes, such as the hybrids RVDA#16 and # RVCS#44 and the cultivar Camino Real, which showed greater resistance. The results indicated that spider mite resistance was related to the mechanisms of the antibiosis types and not preference (Karlec et al, 2017).…”

“…In strawberry plants, both constitutive and inductive defense mechanisms protect plants against pest attack (Karlec et al, 2017). In constitutive defense, the plant does not depend on the presence or action of pests, and its resistance is expressed continuously.…”

Susceptibility to Spirodiclofen in field populations of Tetranychus urticae (Acari: Tetranychidae) from strawberry plantations in Lima region, Peru

“…This crop is mainly cultivated by peasant farmers, with little technical and financial assistance (Redagrícola, 2017). The two-spotted spider mite (T. urticae) is a polyphagous pest that affects more than 1,000 vegetable species of 140 different families (Grbić et al, 2011) and is regarded as the most important pest of strawberry (González-Domínguez et al, 2015;Karlec et al, 2017), causing the death of the plant (Hoy, 2011).…”

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“…Subsequently, these areas are necrotic, with perforations in the leaves [2] . Under severe infestations, these can cause early defoliation, affecting productivity [3] . The occurrence of this mite is reported in regions of hot and humid climate, mainly during the hottest periods of the year [4] .…”