Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Portents, Comets
ग्रहचारः केतवश्च
तद्वक्रमुष्णसंज्ञं स्यात्प्रजापीडाग्निसंभवः ।दशमैकादशे ऋक्षे द्वादशर्वाग्रतीपयः ॥ २८ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 28.
... that turning back is called Ushna. It brings trouble to the people and fire. If it turns back in the 10th, 11th or 12th nakshatra (star) ...
Simple meaning: Mars turning back in the 7th to 9th star after rising brings trouble and fire.
कूक्रं वक्रमुखं ज्ञेयं सस्यवृष्टिविनाशकृत् ।
Mars turning back in the 10th to 12th star may harm crops and rain.
बालास्यचक्रं तत्तस्मिन्सस्यवृष्टिविनाशनम् ।
Mars turning back in the 13th or 14th star may harm crops and rain.
दुर्भिक्षं क्षुद्भयं रोगान्करोति क्षितिनंदनः ।
Mars turning back in the 15th or 16th star can bring famine, hunger and illness.