Periodico olivo 20 giugno 2025

Subscribe to the Aipo YouTube channel to stay up to date - Phenological phase: first growth of olives that have reached an average size of 7 - 12 mm. Risk factors for necrosis and thermal stress in olive groves It is mid-June and the climate situation in many olive groves in the area is becoming critical. Temperatures have exceeded 34°C and the combination with other meteorological factors could put the health of the plants and production at risk On June 14, a temperature peak of 34.2°C was recorded and 34.6 the day after June 16, with values ​​constantly above 30°C in the previous days. When the surface of the olives exceeds 35-40°C, the risk of tissue necrosis increases. From June 10 to 15, relative humidity remained between 37 and 47%, low levels that reduce the effectiveness of transpiration. This means that the plant struggles to cool down. In recent days, olive groves have received over 25 megajoules per square meter of solar energy: useful for photosynthesis, but dangerous if the plants cannot handle it. Strong exposure, exposure without adequate transpirationlive." Wind is also a factor to consider, in recent days gusts have reached 12.8 meters per second. While on the one hand the wind can cool the leaves, on the other, with low humidity, water loss accelerates, worsening water stress. The last significant rain before the critical phase was recorded on June 5, with 32 millimeters, then on June 16 with 10-12 millimeters, which could have given partial relief to the plants, especially in soils capable of retaining moisture. If the soil remains hydrated, the plants can overcome this phase without serious damage, but, if the soil is dry, the young olives most exposed to the sun could suffer from sunburn which, if prolonged, the plant reacts with the premature fall of the drupes or in the most serious cases with necrosis of the olives themselves. Phytosanitary defense Olive moth (Prays oleae): if not already done, it is recommended to intervene in the next few days with an insecticide based on Spinetoram. In organic olive groves it is possible to use Bacillus thuringiensis, (for example Turex by Scam or Delfin by Corteva, to be distributed within the first days of the next, it acts when the eggs are still on the stalk and before the newborn larvae penetrate the olive. S The use of deltamethrin is possible, for example Decis Evo – Deltrin, not for integrated defense, has a broad spectrum of insecticidal action. Margaronia (Palpita unionalis): presence of the lepidopteran, interventions against the moth contain its population. Asiatic stink bug (Halyomorpha halys): the time is approaching to implement a contrast intervention using products based on deltamethrin. Olive fly (Bactrocera oleae): monitoring has highlighted a resumption of flight of adults, for those who intend to use traps for mass capture, “attract and kill”, by means of food attractants and pheromones, it is time to place them on the foliage. Half-grain pepper scale (Saissetia oleae): in the affected olive groves the migrations of nymphs are reaching the intervention thresholds, if necessary use mineral oil, for example Oliocin by Bayer, or potassium salts of fatty acids, for example Flipper by Bayer. Hail events We have entered a season, where large hail events are possible, in this case, remember to intervene with a disinfection with copper salts, also appropriate the integration with products containing manganese and zinc, for example Dentamet - Pryoter Zinc LQ - Zinc EDTA - Zinc Sulphate 35%, which help to contain the Olive Scab. Agronomic strategies for olive growing: defense from heat and parasites June begins with temperatures in Italian olive groves above 32 - 33 ° C, a fact that is no longer an exception, but a new normal climate. This temperature increase leads to an increase in evapotranspiration, or the loss of water from the soil and plants, creating possible water stress. When the leaf is directly exposed to sunlight, its temperature becomes higher than the surrounding air and, even more so, if the leaf has a low transpiration capacity, like that of the olive tree. To deal with these problems, mineral powders based on bentonite, kaolin, lime, talc, zeolite have been used for some years. These rock powders act mainly through a screening effect and, once applied to the leaf surface and olives, reflect the light, limiting the heating of the leaf tissues, even by 5-6 ° C. Complete review at www.aipoverona.it - ​​SERVICES Tel. 045 8678260 @aipoverona Subscribe to the Aipo YouTube channel to stay updated -