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Ohnisková škvrnitosť trávnika (Rhizoctonia solani, R.cerealis)

Škvrny na listoch sú vodnaté, ohraničené tmavým krajom. Pôvodca choroby prečkáva vo forme sklerócií alebo mycélia, ktoré možno pozorovať ako jemnú bielu pavučinu.

Symptómy:

Na listoch sa spočiatku objavujú žlté až svetlo hnedé vodnaté škvrny. Listy sú tenké, hnednú a scvrkávajú sa. Na trávniku sa tvoria škvrny, ktoré sú spočiatku tmavo zelené, neskôr hnednú a  schnú, i keď je dostatok vlahy.  V uschnutom mieste je často časť rastlín zelená (často stred škvrny). Na okraji škvŕn je viditeľný tmavo sivý okraj (smoke-ring). Mycélium prerastá medzi uschnutými listami trávy a možno ho ráno vidieť ako jemnú bielu pavučinu.

Rizikové faktory:

Vysoká teplota a vlhkosť pretrvávajúca počas 3 - 5 dní viac ako 10 hodín počas dňa. 

Vývoj a šírenie:

Pôvodca choroby prečká vo forme mycélia alebo drobných sklerócií  v infikovanej trávnej hmote alebo organických zvyškoch. Za priaznivých podmienok, dochádza k rastu mycélia, k rozvoju huby a jej rozšíreniu na zdravé časti trávnika.

Ochrana:

Choroba napadá väčšinou iba listy, korene odumierajú iba pri veľmi silnom napadnutí, preto napadnutý trávnik zregeneruje po 2 - 3 týždňoch. Medzi preventívne opatrenia patrí vyrovnaná výživa, prísun draslíka v letnom období, pravidelné kosenie a prevzdušňovanie trávnika, vyvarovanie stresu zo sucha, pravidelné odstraňovanie plsti.

V prípade silného napadnutia treba trávnik ošetriť fungicídom s účinnou látkou chlorothalonil, iprodione, azoxystrobin, mancozeb, vonclozolin. V prípade silného napadnutia sa odporúča urobiť dosev prázdnych miest.

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