Which practice reduces problems with Pythium blight and Rhizoctonia blight by reducing leaf wetness?

Which practice reduces problems with Pythium blight and Rhizoctonia blight by reducing leaf wetness?

• A. Sand topdressing
• B. Applying foliar fungicides every week
• C. Increasing irrigation duration to keep leaves wet
• D. Removing water from leaves to reduce leaf wetness

Answer: (D)

The main idea is that Pythium blight and Rhizoctonia blight require a film of moisture on leaf blades to infect. Reducing leaf wetness directly lowers the chance of these fungi taking hold, because drier leaves mean less opportunity for the pathogens to germinate and invade. Removing water from leaves is the best answer because it directly shortens the duration of leaf wetness. In practice, this means irrigating so that turf dries quickly (avoid long, overnight irrigation), improving drainage to prevent water from pooling on the surface, and increasing air movement or dew management to help leaves dry sooner. Even if some moisture is present, faster drying reduces infection risk. Other options don’t address leaf wetness as directly. Applying foliar fungicides can reduce disease impact but doesn’t change the moisture environment that allows infection. Increasing irrigation duration keeps leaves wetter, increasing disease risk. Sand topdressing can help with soil surface conditions and drainage, but it does not guarantee leaves dry quickly or reduce leaf wetness on the blades.

The main idea is that Pythium blight and Rhizoctonia blight require a film of moisture on leaf blades to infect. Reducing leaf wetness directly lowers the chance of these fungi taking hold, because drier leaves mean less opportunity for the pathogens to germinate and invade.

Removing water from leaves is the best answer because it directly shortens the duration of leaf wetness. In practice, this means irrigating so that turf dries quickly (avoid long, overnight irrigation), improving drainage to prevent water from pooling on the surface, and increasing air movement or dew management to help leaves dry sooner. Even if some moisture is present, faster drying reduces infection risk.

Other options don’t address leaf wetness as directly. Applying foliar fungicides can reduce disease impact but doesn’t change the moisture environment that allows infection. Increasing irrigation duration keeps leaves wetter, increasing disease risk. Sand topdressing can help with soil surface conditions and drainage, but it does not guarantee leaves dry quickly or reduce leaf wetness on the blades.