Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Portents, Comets
ग्रहचारः केतवश्च
बालास्यचक्रं तत्तस्मिन्सस्यवृष्टिविनाशनम् ।पंचदशे षोडशर्क्षे वक्रे स्याद्रुधिराननम् ॥ ३० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 30.
... that turning back is Balasya. It may harm crops and rain. If Mars turns back in the 15th or 16th nakshatra (star), it is Rudhiranana.
Simple meaning: 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.
दुर्भिक्षं धनधान्यादिनाशने भयकृत्सदा ।
A Mushala turn tends to bring famine and fear of losing wealth and grain.
अस्तगश्चतुरास्यार्क्षे लोकत्रयविनाशकृत् ।
Mars setting in Rohini may bring wide harm. Risen in Shravana or Pushya it can bring loss of cows and horses.