What is the primary cause of cavity spot in carrots? (CG RHEO 2017)

✅Explanation:
Cavity spot in carrots is primarily caused by a calcium deficiency. This deficiency creates weak spots in the carrot root, making them susceptible to infection by the fungus Pythium spp., particularly Pythium sulcatum and Pythium violae. These fungi thrive in cool, moist soil conditions and cause the characteristic sunken lesions associated with cavity spot.

📌Other Options:
-(A) Iron deficiency: Iron deficiency in crops leads to chlorosis, where leaves turn yellow while veins remain green. It affects chlorophyll production, causing reduced photosynthesis, stunted growth, and poor yields. This is common in alkaline soils or soils with high pH levels.
-(C) Potassium toxicity: Potassium toxicity in crops occurs when excess potassium disrupts nutrient balance, leading to deficiencies in magnesium and calcium. Symptoms include leaf chlorosis, necrosis, and reduced growth.
-(D) Copper deficiency: Copper deficiency in carrots can cause problems like stunted growth or misshapen roots, but it's not the primary cause of cavity spot.