Anastrepha fraterculus (Wiedemann) and A. obliqua (Macquart) are important pests of fruit crops. In Brazil, these species cause damage to fruit growing in the South (annual average temperature of 20.9 °C) and Northeast (average yearly temperature of 24 °C). We evaluated the effect of temperature on the viability and development time of A. fraterculus and A. obliqua immature stages in their respective preferred hosts, guava (Psidium guajava L., Myrtaceae) and mango (Mangifera indica L., Anacardiaceae). The duration of egg and pupal stages, egg to pre-pupa, and viability of egg and pupal stages under different temperatures (15, 20, 25, 30, and 35 °C) were assessed. For both species, development time decreased with increasing temperature. Viability in the evaluated stages was only observed between 15 and 30 °C. However, the species responded differently to the exposure temperatures (15 and 30 °C), especially in the pupal stage and from egg to pre-pupa. Anastrepha fraterculus showed a lower tolerance to high temperatures, especially in the pupal stage and from egg to pre-pupa, which may explain its lower importance and economic impact in warmer Brazilian regions. Anastrepha obliqua had a lower tolerance at 15 °C, indicating greater adequacy for temperatures above 20 °C, characteristic of Northeast Brazil, suggesting the capacity to spread to cooler areas with rising temperatures.

Anastrepha fraterculus (Wiedemann) 和A. obliqua (Macquart) 是果树作物的重要害虫。在巴西，这些物种对南部（年平均气温20.9°C）和东北部（年平均气温24°C）的水果生长造成损害。我们评估了温度对A. fraterculus和A. obliqua未成熟阶段在各自首选寄主番石榴（Psidium guajava L.，桃金娘科）和芒果（Mangifera indica L.，漆树科）中的活力和发育时间的影响。评估了卵和蛹阶段的持续时间、卵到预蛹的持续时间以及不同温度（15、20、25、30和35°C）下卵和蛹阶段的活力。对于这两个物种，发育时间随着温度的升高而缩短。仅在 15 至 30 °C 之间观察到评估阶段的活力。然而，这些物种对暴露温度（15 和 30 °C）的反应不同，特别是在蛹阶段以及从卵到蛹前。按蚊表现出对高温的耐受性较低，特别是在蛹阶段以及从卵到预蛹期间，这可能解释了其在巴西温暖地区的重要性和经济影响较低的原因。斜生按实蝇在 15°C 下的耐受性较低，这表明它更适合 20°C 以上的温度（这是巴西东北部的特征），表明随着温度上升，它有能力传播到较冷的地区。