The melon fly, Bactrocera cucurbitae (Coquillett) (Diptera: Tephritidae), is a significant pest of cucurbit crops, causing considerable economic losses through direct damage and secondary infections. This study investigates the spatiotemporal damage distribution of melon fly infestations on cucumber (Cucumis sativus L.) flowers and fruits during the critical growing seasons of 2022 and 2023 in Meerut, Uttar Pradesh, India. Data were collected weekly across five standard weeks, focusing on different developmental stages of the crop—flowers, young fruits, developing fruits, and ready-to-harvest fruits.

Results indicate that damage severity varied significantly across growth stages, with young and developing fruits experiencing the highest infestation rates, particularly during the 12th standard week (SW). Environmental factors such as temperature, rainfall, and humidity were closely correlated with infestation patterns, with 2022 recording higher damage (16.04% peak) due to warmer and more humid conditions compared to 2023 (14.51% peak), which experienced milder weather.