Potassium Reduced growth. Leaves develop characteristic bronzing followed by necrotic lesions along the veins and leaf fall. Correction measure: Foliar spray of K2SO4 @1% at weekly intervals. Magnesium Interveinal chlorosis of immature and recently matured leaves. Necrotic lesions develop within the chlorotic areas. Correction measure: Foliar spray of MgSO4 @ 1% at fortnightly intervals. Boron Young leaves become small and malformed. Correction measure: Foliar application of borax@0.2%. Iron Inter-veinal chlorosis of young leaves veins remain green and leaf size reduced. In severe cases, whole leaf become chlorotic and yellow and fall. Correction measure: Foliar spray of FeSO4 @1.0% at fortnightly intervals. Manganese Yellowing of young leaves; veins remain green. Correction Measure: Foliar application of MnSO4 @ 0.5% solution in water IPM for Black Pepper To know the IPM practices for Black Pepper, click here. Source: NIPHM and Directorate of Plant Protection, Quarantine & Storage