Abstract
Mashhad Province is the second largest apple-producing area in north-east Iran. Cydia pomonella is one of the important pests in this province. This pest, which passes through 3–4 generations, may cause serious damage in apple orchards. Forecasting and supervising C. pomonella by a pest control network started in 1984 in this province. Forecasting is based on the accumulated heat-unit requirement for different stages of pest development. Peak flight dates were determined by the use of pheromone traps. The flight date of the first generation was determined on the basis of a 130 degree-day requirement (by 10°C threshold). The probability interval for the arrival of this date was calculated (at 25% risk) using long-period weather data. Recommended data for pest treatment are forecast.
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