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Lobiopa insularis is one of the main pests of strawberry crop, causing direct damage to fruit, making them unfeasible for consumption and commercialization. This study aimed to estimate, under laboratory conditions, base emperature and thermal requirements of the eggs, larvae, pupae and the biological cycle (from egg to adult) of L. insularis. Insects were reared on artificial diet based on strawberry fruits, at temperatures of 16, 19, 22, 25, 28 and 31°C, using air-conditioned chambers (70±10% R.H.; 12 h photophase). The number of annual generations of L. insularis was estimated for eight municipalities belonging to the main strawberry growing regions in Brazil, considering base temperature and thermal constant. Development time of L. insularis was proportional to the temperature increase. The best development rate was obtained when insects were reared at 22 and 25oC. Based on thermal requirements of L. insularis, the number of annual generations was estimated between 5 and 7 per year, according to the studied region. Resumo: Exigencias termicas e estimativas do numero de geracoes anuais de Lobiopa insularis em morangueiro Lobiopa insularis e uma das principais pragas da cultura do morangueiro, provocando danos diretos nos frutos, inviabilizando--os para o consumo e comercializacao. Neste trabalho, foi estimada a temperatura base e as exigencias termicas das fases de ovo, larva, pupa e do ciclo biologico (ovo a adulto) de L. insularis. Os insetos foram criados em dieta artificial a base de frutos de morango maduros, nas temperaturas de 16, 19, 22, 25, 28 e 31°C, utilizando câmaras climatizadas (70±10% U.R.; fotofase de 12h). O numero de geracoes anuais de L. insularis foi estimado para oito municipios pertencentes as principais regioes produtoras de morango no Brasil, por meio da temperatura base e da constante termica. A velocidade de desenvol-vimento de L. insularis aumentou com a elevacao da temperatura. A faixa mais adequada para o desenvolvimento da especie foi entre 22 e 25oC. Com base nas exigencias termicas de L. insularis ,o numero de geracoes anuais foi estimado entre cinco e sete de acordo com a regiao estudada.Palavras-chave: Fragaria x ananassa, broca-do-morangueiro; ciclo biologico; temperatura base.

Thermal requirements and estimates of the annual number of generations of Lobiopa insularis on strawberry crop