Periodico olivo 15 Maggio 2026

Subscribe to the Aipo YouTube channel to stay updated - Magazine No. 20 of May 15, 2026 - Phenological phase: bud development continues; the first flowers are opening in the main oil-producing varieties, especially in warmer locations. Physiological status of olive trees and water and nutritional status The olive trees show good overall vegetative vigor. Considering that flowering is expected between May 20th and 25th, foliar treatment can still be performed in the next few days, as long as the inflorescences are not yet open. Quick-absorbing organic nitrogen and pre-flowering boron are recommended. Biostimulants can also be used close to flowering, avoiding treatments when the flowers are open. Once anthesis has begun, all foliar fertilization should be suspended. Phytosanitary situation Olive moth (Prays oleae): Monitoring underway; no critical situations are currently reported. Margaronia (Palpita unionalis): Limited activity on tender shoots. If necessary, treatment can be done with: Bacillus thuringiensis, potassium soaps based on fatty acids, and azadirachtin (e.g., Oikos) to regulate the larval cycle. Sand beetle (Phloeotribus scarabaeoides): Possible oviposition in pruning debris left in the field. It is essential to remove and destroy woody material to limit population growth. Brown marmorated stink bug (Halyomorpha halys): Sporadic occurrences reported. Constant surveillance is recommended, especially near orchards and host crops. Olive cotton (Euphyllura olivina): Irregular presence of colonies on shoots and inflorescences. The infestation is generally limited and does not require immediate intervention. Careful monitoring is recommended in historically affected areas; if necessary, potassium soaps, effective upon contact, can be used. Olive thrips (Liothrips oleae): Feeding symptoms (leaf drop, silvering) observed on young leaves. Damage is below the threshold; treatment is not warranted. Olive fruit fly (Bactrocera oleae): Slight increase in flight activity, with captures of 2 to 6 adults per trap per week. Fungal diseases Peacock spot (Spilocaea oleaginea): Widespread presence, favored by humidity and recent rainfall. During the flowering period, the use of copper may be phytotoxic to the inflorescences; therefore, the following are preferable: Dodine, Pyraclostrobin, Potassium phosphonate, and Bacillus subtilis (strains with certified antifungal activity). Treatment is especially recommended for farms with recurrent symptoms. Olive Tree Foliar Nutrition in May-July In the olive tree's annual cycle, the period between flowering and stone hardening, between May and July, represents the phase of maximum energy demand. These weeks are the time of day for cell division, tissue differentiation, fruit set stabilization, and the definition of the year's production potential. Any nutritional deficiencies, even brief ones, not only impact current production but also interfere with the hormonal mechanisms that regulate future flowering, contributing to alternate bearing. The olive tree allocates a significant portion of available nitrogen to maintaining its foliage. With rising spring temperatures and the onset of water stress, the plant reduces stomatal opening to limit transpiration. This phenomenon limits the upward flow of water and nutrients, reducing the efficiency of root absorption precisely at the time of maximum demand. Under these conditions, foliar application of organic nitrogen in the form of peptides and amino acids is technically advantageous. Formulations such as Leaf N, for example, ensure immediate availability of N even in the presence of stomatal stress or dry soils. These molecules pass through the cuticle by diffusion and do not require metabolic energy. In these cases, the effectiveness of foliar treatments depends on the solution's pH and the ability to transport nutrients through the cuticle. Wood distillate, thanks to its acetic acid and phenolic compounds, lowers pH and improves the availability of micronutrients such as boron. This function is fully compatible with specific acidifiers, such as Hydrostar BTC, which stabilize the mixture and optimize nutrient penetration. At the same time, biostimulants containing natural osmolytes help protect cell membranes during the temperature peaks of June and July, reducing the risk of fruit drop due to water stress. Nutritional requirements during critical phenological phases. Tel. 045 8678260 @aipoverona Subscribe to the Aipo YouTube channel to stay updated -