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• Olive peacock spot: symptoms and a region-by-region spray calendar

  The commonest of olive tree diseases: concentric rings on the leaf, shedding, a shrubby tree. Yield falls 20-25%; spray timing varies by region.

  … dark spots in **concentric rings** on your olive leaves, the tree has peacock spot (*Spilocaea oleagina*). Türkiye's technical instruction ranks it, alongside the olive fruit fly, …

• Weeds in the olive grove: bare soil is not the goal

  Johnson grass, Bermuda grass and fat hen. With perennials, ill-timed tillage spreads them while mowing stops the seed. Clean under the canopy, covered between rows.

  … raise humidity under the canopy and set the stage for **anthracnose** and peacock spot, they shelter pests, and they make harvest and machinery access harder. But …

• Organic olive growing: what a four-year trial found

  A four-year organic vs conventional trial at Kemalpaşa: no yield difference, 11.5% higher gross margin for organic, lower peroxide value, but higher fruit oil content under conventional management.

  … four years**, so no treatment was applied against it at all. Peacock spot, olive knot and verticillium were also monitored but caused no damage, so nothing …

• Other olive pests: jasmine moth, psyllid and olive scale

  Three olive pests overshadowed by the fruit fly: the jasmine moth on tender shoots, the cottony psyllid, and olive scale.

  … Related reading: [Olive fruit fly control](/en/olive-fruit-fly-control) · [The olive moth](/en/olive-moth-three-generations) · [Olive black scale and sooty mould](/en/olive-black-scale-and-sooty-mould) · [Olive peacock spot](/en/olive-peacock-spot-disease)

• Olive knot: galls, warts and a bacterium that enters through wounds

  The bacterial canker among olive tree diseases that enters through wounds: galls and warts. Pole harvest and pruning errors spread it.

  … spring rain (**1%**), before autumn rain. ## Source > Republic of Türkiye, Ministry of Agriculture and Forestry, General Directorate of Agricultural Research and Policies, Department of …

• Verticillium wilt: the disease that kills the tree and has no cure

  The olive tree disease that kills: it survives over 10 years in the soil, blocks the vessels, and has no effective chemical control.

  … grow **cereals for two years** first. - ⚠ **No intercropping**, no flood irrigation, no excess nitrogen. - ⚠⚠ **There is no effective chemical control.** Prevention is …

• The olive moth: three generations, three kinds of damage

  The olive pest with three generations: it winters in the leaf, eats the flowers, enters the fruit. One larva can take 30-40 buds.

  … 2022. Related reading: [Olive fruit fly control](/en/olive-fruit-fly-control) · [Olive peacock spot](/en/olive-peacock-spot-disease) · [The olive harvest: when and how](/en/the-olive-harvest-when-and-how)