Codling Moth

Cydia pomonella — the codling moth — is THE WORLD'S MOST DAMAGING APPLE PEST and the SINGLE MOST IMPORTANT INSECT PEST OF GLOBAL APPLE PRODUCTION. The species is essentially cosmopolitan in apple-producing regions — present worldwide wherever apple, pear, walnut, quince, and related Rosaceae fruit crops are grown. The species is native to Eurasia but has spread globally with apple cultivation since prehistoric times. Adults are 1.5-2 cm wingspan, with the species' diagnostic features: small grayish-brown moths with subtle darker wing markings and a distinctive dark coppery-bronze patch at the wing tip (the wing-tip patch is the diagnostic field-ID feature distinguishing codling moth from related Tortricidae). Larvae are pinkish-cream small caterpillars (10-12 mm when fully grown) with darker head capsules. The species is responsible for the proverbial 'WORM IN THE APPLE' — apples damaged by codling moth larvae have one or more entry tunnels in the fruit surface and tunneling damage through the apple flesh, often with darker frass-filled cavities visible when the apple is cut open. Damaged apples typically drop prematurely or develop secondary fungal rot from the larval entry wounds. The species' biology: female moths lay eggs on or near developing apples in late spring; larvae hatch and CHEW INTO THE APPLE through a small entry hole (typically near the calyx end or stem end of the apple), tunnel through the apple flesh to reach the seed cavity, feed on the apple seeds and surrounding flesh, then exit the apple through a larger exit hole when fully developed. Mature larvae descend the tree on silk threads or by crawling, and overwinter in cocoons under loose bark or in soil at the base of the host tree. Annual global ECONOMIC LOSSES to codling moth exceed $1 BILLION ANNUALLY across major apple-producing regions (China — the world's largest apple producer; US Pacific Northwest, US Northeast, Canada — major NA apple regions; India, Turkey, Italy, France, Iran, Poland, Russia — major global apple regions). The species is also the foundational case study in modern PHEROMONE MATING DISRUPTION pest control. Synthetic codling moth pheromone (the female sex pheromone codlemone) is the MOST-USED PHEROMONE DISRUPTION PRODUCT in modern agriculture — applied as small plastic dispensers hung in apple trees that release synthetic pheromone over the orchard, saturating the air with female pheromone signal so that male moths cannot locate actual females for mating. Pheromone disruption is highly effective in apple orchards (when properly deployed across large connected orchard areas) and provides season-long control without insecticide applications. MILLIONS OF HECTARES OF APPLE ORCHARDS GLOBALLY are treated with codling moth pheromone dispensers as a primary control method. The species is also the focus of major STERILE INSECT TECHNIQUE programs (especially in British Columbia, Canada, where the BC Sterile Insect Release program has run continuously since 1992 and provides regional codling moth suppression to BC apple-growing regions). The species is harmless to humans (no bite, no sting) but is the single most important insect pest of global apple production.