4 research outputs found
DEVELOPMENT OF Tetranychus urticae KOCH (ACARI: TETRANYCHIDAE) IN DIFFERENT STRAWBERRY CULTIVARS
Resistance of strawberry cultivars to the Tetranychus urticae Koch (Acari: Tetranychidae)
The two-spotted spider mite, Tetranychus urticae Koch is considered a major pest of
strawberries. His control is hampered by the low efficiency of the products used,
populations resistant to acaricides and the high reproductive potential of this pest.
This difficulty has led to the indiscriminate use of pesticides, leading to a sequential
increase of pesticide residues in fruit. Thus the use of resistant plants is one
regarded as optimal control method. Allows maintenance of the pest below the levels
of economic damage, minimizing the environmental impact of the use of pesticides
without causing damage to the environment and without additional burden to the
farmer, also served as an auxiliary tool in integrated pest management, and may be
associated with other practices of pest management. In this sense, the study aimed
to evaluate the resistance of strawberry cultivars to two-spotted spider mite, through
the study of the development of the mite in biology experiment, test non-preference
for feeding and oviposition and no-choice laboratory and evaluation of the reaction
field two-spotted spider mite in different strawberry cultivars. The experiments
showed that strawberry cultivars influenced the preference for feeding, development
and oviposition, indicating the existence of resistance among cultivars to two-spotted
spider mite.O ácaro-rajado, Tetranychus urticae Koch é considerado a principal praga da cultura do
morangueiro. Seu controle é dificultado pela baixa eficiência dos produtos
empregados, populações resistentes a acaricidas e ao alto potencial reprodutivo
dessa praga. Isso tem levado ao uso indiscriminado de agrotóxicos, ocasionado um
aumento seqüencial de resíduos de agroquímicos na fruta. Assim, o emprego de
plantas resistentes é um método considerado ideal de controle, pois permite a
manutenção da praga em níveis inferiores aos de dano econômico, minimizando o
impacto ambiental do uso dos defensivos, sem causar prejuízos ao meio ambiente e
sem ônus adicional ao agricultor, servindo também como ferramenta auxiliar no
manejo integrado, podendo ser associado com outras práticas de manejo da praga.
Nesse sentido, o trabalho teve como objetivo avaliar a resistência de cultivares de
morangueiro ao ácaro-rajado, através do estudo do desenvolvimento do ácaro em
experimento de biologia, teste de não-preferência à alimentação e à oviposição com
e sem chance de escolha em laboratório e avaliação da reação a campo de
cultivares de morangueiro ao ácaro-rajado. Os experimentos realizados mostraram
que as cultivares de morangueiro influenciaram na preferência à alimentação,
desenvolvimento e oviposição, indicando a existência de resistência diferenciada
entre cultivares estudadas para o ácaro-rajado
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