Periodico olivo 19 Giugno 2026

Subscribe to the Aipo YouTube channel to stay updated - Magazine No. 25 of June 19, 2026 - Phenological stage: first growth of olives, which have reached an average size of 7-13 mm. Phytosanitary control Olive moth (Prays oleae): The carpophagous generation is active in all monitored areas. If treatment has not already been performed, in the next few days it is advisable to treat with Spinetoram (e.g., Delegate™ WDG), an active substance derived from the modification of spinosyns, characterized by high photostability, excellent tissue penetration, and strong larvicidal activity in the early feeding stages. In organic olive groves, treatment with Bacillus thuringiensis (e.g., Turex, Delfin) can be performed in the evening, on evenly moistened canopies, while the eggs are still on the peduncle and before the larvae penetrate the fruit. If the water pH exceeds 8, it should be acidified to maintain the effectiveness of the formulation. Deltamethrin (e.g., Decis Evo, Deltrin) can also be used, although it is not permitted in integrated pest management, but is effective as a knockdown agent in cases of high pressure. Union stink bug (Palpita unionalis): Presence on shoots and young leaves. Treatments carried out against the union stink bug are also indirectly effective on this lepidopteran, reducing its population. Brown stink bug (Halyomorpha halys): Early-stage nymphs are visible. This is the best time to treat with deltamethrin-based products, which are more effective on juveniles than adults. Monitor for any new egg-laying in the coming weeks. Olive fly (Bactrocera oleae): Consistent captures on monitoring traps, 7–8 individuals; for those adopting mass trapping strategies or "attract and kill" systems, this is the ideal time to place traps in the canopy. Examples: Eko Trap (Biogard), Dakofaka, Flypack Dacus Trap (Serbios). The goal is to reduce the initial population before the stone hardens. Pepper mealybug (Saissetia oleae): Nymph migrations are reaching intervention thresholds in affected olive groves. If necessary, mineral oil (e.g., Oliocin) or potassium salts of fatty acids (e.g., Flipper) can be used. Apply during the cool hours and with good wetting of the undersides of the leaves. Sooty mold. In olive groves with mealybugs, the first blackish-velvety stains are observed. Treatments against peacock's eye also help contain sooty mold, reducing the availability of honeydew. Fungal Parasites Peacock spot (Spilocaea oleagina), Olive leaf spot (Colletotrichum spp.), Olive leaf spot (Pseudocercospora cladosporioides). The risk of infection is currently low, but if necessary, treatment can be done with: copper salts, potassium phosphonate, and pyraclostrobin. Always assess the vegetative state and leaf wetting patterns. Hail Events We have entered the seasonal phase in which hail is possible. In the event of an event, promptly apply a copper-based disinfectant to protect the wounds. It is helpful to supplement with products containing manganese and zinc (e.g., Dentamet, Pryoter Zinc LQ, Zinc EDTA, Zinc Sulfate 35%), which promote healing and help limit the spread of olive leaf spot. ------ Risk factors for necrosis and heat stress in olive groves We are now past mid-June, and the climate situation in many local olive groves is becoming delicate. Temperatures have repeatedly exceeded 34–35°C, and as observed in recent years, it is not only the temperature that determines the risk, but the combination with other atmospheric parameters that amplify stress on the plants. Between June 12th and 16th, peaks of 34–35°C were recorded, with values ​​consistently above 30°C during the central hours. When the surface of the olives exceeds 35–40°C, the risk of tissue necrosis significantly increases, especially in the drupes most exposed to direct radiation. Relative humidity, between 38 and 52% during the hottest hours, is not sufficient to support effective transpiration: in these conditions, the plant struggles to cool down, and the leaf temperature can exceed the air temperature by up to 4–6°C. A key role is played by global radiation, which is the total amount of solar energy reaching the surface, the sum of direct and diffuse radiation. In recent days, olive groves in the area have received values ​​exceeding 26–28 megajoules per square meter per day, high levels for mid-June. This energy is essential for photosynthesis, but becomes a risk factor when the plant is unable to dissipate it through transpiration. ... Tel. 045 8678260 @aipoverona Subscribe to the Aipo YouTube channel to stay updated -