Phyllosticta — Plant Disease

Phyllosticta is a group of fungi that cause leaf spot on many garden plants and some houseplants. It spreads in warm, damp weather, mainly by splashing water and when leaves stay wet for hours. Look for small, round spots that start tan or light brown with a darker brown to black edge. The spots can merge, leaves may yellow, and early leaf drop can follow. Tiny black pinhead dots often appear inside the spots—these are the fungus’s fruiting bodies. Phyllosticta is common on ornamentals such as hydrangea, iris, peony, lilac, maple, and roses, and it can also show up on citrus and other fruit trees.

Što je Phyllosticta?

Phyllosticta je gljivični stanje s umjeren ozbiljnošću koje utječe na biljke. Phyllosticta is a group of fungi that cause leaf spot on many garden plants and some houseplants. It spreads in warm, damp weather, mainly by splashing water and when leaves stay wet for hours. Look for small, round spots that start tan or light brown with a darker brown to black edge. The spots can...

Phyllosticta je gljivični bolest sa umjeren ozbiljnošću. Ovo stanje je zarazno i može se širiti između biljaka.

Za razliku od bakterijskih infekcija, Phyllosticta se širi polako, ali je teže iskorijeniti. Bez liječenja, zahvaćeno lišće se neće oporaviti. Bez izolacije, susjedne biljke mogu biti zaražene u roku nekoliko dana.

🧪 Prirodno ili kemijsko: koji tretman djeluje za Phyllosticta?

🌱 Prirodna rješenja

✓ Remove and bin infected leaves, and compost them only in a hot compost system.
✓ Rake up and dispose of fallen leaves around plants.
✓ Prune to open the canopy and improve airflow, and avoid crowding by spacing plants well.
✓ Water at the base of plants, and if you must water overhead, do it early so foliage dries quickly.
✓ For houseplants, provide bright light and airflow, avoid misting infected plants, and isolate them from healthy ones.
✓ Disinfect tools between plants using 70% isopropyl alcohol or 10% bleach followed by a rinse and dry.
✓ Add mulch under outdoor plants to reduce soil splash, and improve drainage or repot if the mix stays wet too long.
✓ Remove heavily infected leaves, and if infection is severe, cut back to healthy growth.

💉 Kemijska rješenja

✓ Use a fungicide labeled for leaf spot on your specific plant if cultural steps are insufficient.
✓ Apply copper-based products such as copper soap or copper hydroxide as labeled for leaf spot.
✓ Apply sulfur only to plants listed as tolerant on the label.
✓ Use biofungicides containing Bacillus subtilis, Bacillus amyloliquefaciens, or Trichoderma species.
✓ Use phosphite fungicides such as potassium phosphite or phosphorous acid as preventatives.
✓ Test any product on a small area first, avoid spraying in high heat, and observe pre-harvest intervals on edible plants.
✓ Do not mix sulfur with oils or apply them within about two weeks of each other.

🛡️ Kako spriječiti Phyllosticta?

TLDR: Spriječite Phyllosticta s 7 osnovnih mjera njege. Redovito praćenje je ključno za rano otkrivanje.

✓ Quarantine new plants for 2–3 weeks and inspect regularly.
✓ Water early in the day and keep leaves as dry as possible, and avoid frequent light misting.
✓ Provide good spacing, prune routinely, and keep the area free of fallen leaves.
✓ Avoid overfeeding with high-nitrogen fertilizers that cause soft, spot-prone growth.
✓ Choose less-susceptible or resistant varieties when available.
✓ Disinfect pots and trays before reuse, and do not reuse old, contaminated potting mix.
✓ After leaf drop or in winter, clear and dispose of old leaves and prunings to reduce next season’s spores.

🔗Srodne bolesti

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Pepelnata plamenjača je česta gljivična bolest uzrokovana različitim vrstama gljiva uključujući Erysiphe, Podosphaera, Oïdium i Leveillula. Zahvaća više od 10 000 biljnih vrsta diljem svijeta. Bolest se razvija u toplim, suhim klimatskim uvjetima s visokom vlagom zraka i pojavljuje se kao karakterističan bijeli praškasti premaz na površinama biljaka.

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Trulež korijena

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