Periodico olivo 22 Maggio 2026

Subscribe to the Aipo YouTube channel to stay updated - Magazine No. 21 of May 22, 2026 Phenological phase: The 2026 season presents uneven flowering and a phenological delay compared to last year and, even more so, compared to 2024. We find olive trees with buds still partially open or signs of early flowering or already petal fall. The low temperatures of the last few days, combined with local rains and persistent nighttime humidity, have slowed the phenological progression. Weather conditions in recent weeks The weather conditions of the last few weeks show two brief windows favorable for the development of peacock spot (May 11 and 15–16), while the rest of the period has been dry and unfavorable to the pathogen. Flowering is beginning thanks to mild temperatures and good radiation. The soil has excellent water status and no favorable conditions for the olive fruit fly have been detected. The low temperatures of May 14–16 may have caused mild apical physiopathies. Periodical No. 21 of May 22, 2026 Phenological phase: The 2026 season presents uneven flowering and a phenological delay compared to last year and, even more so, to 2024. We find olive trees with buds still partially open or signs of early flowering or already petal fall. The low temperatures of the last few days, combined with local rains and persistent nighttime humidity, have slowed the phenological progression. Weather conditions in recent weeks The weather conditions of the last few weeks show two brief windows favorable for the development of peacock spot (May 11 and 15–16), while the rest of the period has been dry and unfavorable to the pathogen. Flowering is beginning thanks to mild temperatures and good radiation. The soil has excellent water status and no favorable conditions for the olive fruit fly have been detected. The low temperatures of May 14–16 may have caused mild apical physiopathies. This week, young apices were observed with slight curvature and marginal necrosis of the most tender leaves. The symptoms are consistent with "straining" due to the recent cold spells and easterly winds that affected the region. In the same olive groves, the less exposed apices and the sheltered portions of the canopy showed no alterations, confirming the physiological origin of the phenomenon. No intervention is necessary. Phytosanitary situation Olive moth (Prays oleae): Captures recorded at monitoring points ranged from 2 to 5 adults/trap/week, values ​​lower than the historical average. Low temperatures and frequent rainfall have slowed flight activity. However, it is advisable to continue active monitoring. Especially in young orchards and areas with tender vegetation. The cold weather of recent days has limited larval activity, but for farms that have recorded significant infestations in 2025, treatment with Bacillus thuringiensis var. kurstaki is recommended (for example, Bacillus Chemia PFnPE or Doctrin or Delfin, registered on olive trees to control Prys oleae and also usable to control young Margaronia larvae thanks to the same spectrum of activity). Apply during the cool hours to maximize effectiveness, as the product is photolabile. Olive cottonworm (Euphyllura olivina): irregular presence; in case of large colonies, treatment with potassium soaps can be carried out, spreading them evenly on the foliage during the cool hours. Repeat if necessary after 5–7 days. Olive gall midge (Dasineura oleae): generally limited infestations. Olive fruit fly (Bactrocera oleae): rain and low temperatures have almost eliminated flight activity. No treatment necessary. Monitoring will resume as temperatures rise. Brown marmorated stink bug (Halyomorpha halys): few presences at the edges of olive groves Fungal parasites The weather conditions of the last two weeks, localized rains, and wet nights, have significantly increased the risk of fungal infections: Peacock spot, Leprosy, Lead spot, and Botryosphaeriaceae. Since flowering has not yet begun, prompt intervention is possible, while avoiding copper-based treatments in vineyards where the buds are starting to whiten. Recommended treatments: Dodine: effective for both prevention and early treatment, ideal in the presence of active symptoms. Potassium phosphonate: systemic, rapid, also useful when mixed with Dodine (always check the label). Bacillus subtilis QST 713 (e.g., Serenade® Aso): useful for reducing fungal pressure and also limiting Pseudomonas savastanoi. To be avoided at this stage: copper-based treatments, if the buds are opening; Sulfur, which can increase tissue stress. Risks of peacock eye infection Tel. 045 8678260 @aipoverona Subscribe to the Aipo YouTube channel to stay updated -