Injury to sunflower blossoms by the European sunflower moth, Homoeosoma nebulella Denis & Schiffermüller, significantly diminishes the harvest of sunflower seeds per hectare in commercial production in the Ganja-Ghazakh crop-growing region of the Republic of Azerbaijan. Annual seed losses of ~460 kg/ha can occur. Economic thresholds (ET), at which time insecticides or other remedial actions should be used to avoid exceeding the economic injury level (EIL), were determined for each of the two generations of H. nebulella that occur annually. The EIL was five to six eggs or large (≥third instar) larvae per blossom for the first generation, or about one egg or small (first or second instar) larvae per blossom for the second generation. The ET for adults caught in pheromone traps was 25.7 per day for the first generation and 3.7 per day for the second generation. Results also indicate that preventative or remedial actions should be used against the second generation of this pest, but such actions do not appear necessary to limit damage caused by the first generation.
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Vol. 50 • No. 2