Concimazioni con il gran caldo: dosi operative e prodotti utili per sostenere l’olivo

Subscribe to our YouTube channel to stay updated - Magazine No. 26 of June 26, 2026 - Phenological stage: first olive swelling The olives begin to grow and swell significantly, reaching an average size of 14 to 18 mm. Plant health situation Olive moth (Prays Oleae): In treated olive groves, monitoring has shown a marked reduction in adult populations. Those who have not yet implemented treatments may consider using Spinetoram (e.g., Corteva's Delegate™ WDG). In organic farming, Bacillus thuringiensis (e.g., Ascenza's Doctrin or Corteva's Delfin®), natural pyrethrum (e.g., Manica Green Pyrethrum), or Azadirachtin (e.g., Sipcam's Oikos®) are recommended. Deltamethrin (e.g., decis EVO or Deltrin), which is not included in the integrated production regulations, may also be used. Olive fly (Bactrocera oleae): This is the ideal time to set up mass-trapping traps, especially for table varieties that are already showing bites. At this stage, olives release attractive substances that encourage attack. Brown marmorated stink bug (Halyomorpha halys): Presence of adults, eggs, and nymphs. It is recommended to treat with Deltamethrin (e.g., Decis Evo), which offers a dual effect: stink bug control and support for treatment against the olive moth. Peppercorn scale (Saissetia oleae): Over 95% of eggs have hatched. Those who have not yet treated can treat with mineral oil (e.g., Bayer's Oliocin Plus) or soft soaps (e.g., LDT's FLiPPER). Peacock spot (Spilocaea oleagina): where confirmed, treatment with copper oxychloride or hydroxide (e.g., Airone Più by Gowan Italia) or Pyraclostrobin (e.g., Cabrio Olivo by BASF) is recommended. Fertilization during hot weather: physiological criteria, application doses, and useful products to support olive trees Fertilization during hot weather stems from the need to completely rethink olive tree summer nutrition in light of climate change. Air temperatures at olive tree canopy level increasingly exceed 34–36°C, while the soil surface explored by the roots generally ranges between 23 and 30°C. In this temperature range, the root system remains physiologically active, but slows down. Recent studies by Fernández (2020), Connor & Fereres (2021), Proietti (2019), Kavvadias (2021), and Ben Gal (2020) show that olive trees maintain root activity even during the hottest weeks of the year, although their absorption mechanisms change. Summer nutrition must therefore meet three physiological needs: supporting photosynthesis, maintaining an active rhizosphere, and ensuring phosphorus availability during the stages of stone hardening and drupe growth. After flowering and fruit set, nitrogen supply shifts almost entirely to the foliar route, using organic forms, amino acids, peptides, and protein hydrolysates, which ensure immediate availability without being affected by the enzymatic limitations of summer soil. Urease is an enzyme present in the soil, produced by bacteria, fungi, and organic matter, which converts urea into ammonia, an essential step for the nitrogen in urea to be assimilated by the olive tree. This process, however, is extremely sensitive to temperature and humidity: when the soil is hot and dry, urease becomes unstable, sometimes working too quickly, resulting in losses through volatilization, and other times slowing abruptly in the absence of humidity. Phosphorus is the most critical element in summer: it retrogrades in calcareous soils and becomes less available in dry soils. Studies by the Greek school led by Kavvadias show that only acidic or complexed forms maintain mobility in hot conditions. For this reason, polyphosphates, highly soluble monoammonium phosphates, and potassium or ammonium phosphites become essential tools. Among the most effective phosphate forms in summer is MAP (MonoAmmonium Phosphate), a highly soluble and slightly acidifying phosphate, capable of maintaining good mobility even in calcareous soils and at high temperatures. In the Cerea FCP range, Reactive P and Futura P perform a similar function. These highly mobile liquid polyphosphates are used in fertigation or in localized microdoses (5–12 L/ha). MAP, in solid form, is applied at 8–20 kg/ha. For foliar nutrition and summer root stimulation, Leaf P-Ca is also used. This potassium and calcium phosphite is used at 3–5 L/ha and is particularly effective in maintaining the firmness of the drupe. Thanks to their biostimulant action, phosphites maintain the rhizosphere's activity even at high temperatures and are applied by foliar application at 0.2–0.4% every fifteen to twenty days. ... Subscribe to the YouTube channel to stay updated -