Which Slavic noon spirit is said to haunt fields at midday?

The Slavic noon spirit said to haunt fields at midday is Poludnitsa.

Poludnitsa is a female field spirit found in the folklore of several Eastern European Slavic peoples. Her name comes from Slavic words related to “midday” or “half-day,” and she is also known in English as Lady Midday, Noonwraith, or noon witch. Folklore commonly places her in or around agricultural fields, especially during the hottest part of the day and the harvest season.

Stories portray her in different ways: as a young woman in white, an old woman, or a dangerous supernatural figure carrying a whip or other implement. She may attack people working through the noon break, causing heatstroke, neck pain, madness, illness, or death. Some traditions also say she guards crops or punishes children who damage them. Poludnitsa is often confused with a rusalka, but rusalki are generally associated with water, vegetation, and seasonal spirits rather than the dangerous midday interval.