Explore common leaf disorders and diseases affecting Bengal Gram crops, with practical questions on symptoms, causes, and management options. Ideal for growers and students seeking a deeper understanding of plant health in agriculture.
A Bengal Gram field shows yellowing and stunted growth, especially on older leaves. Which disorder is most likely responsible?
Explanation: Zinc deficiency typically causes yellowing (chlorosis) and stunted growth in older Bengal Gram leaves, especially in soils with high pH. Iron deficiency affects young leaves and rarely causes stunting. Powdery mildew creates white, powdery fungal growth but not uniform yellowing. Leaf miner damage results in winding trails or blotches, not generalized yellowing.
A grower observes white, powdery spots forming on both sides of Bengal Gram leaves during cool, dry weather. Which issue does this symptom indicate?
Explanation: Powdery mildew produces characteristic white, powdery fungal growth on leaves, especially under cool and dry conditions. Anthracnose causes dark lesions, not white spots. Septoria leaf spot leads to brown spots with yellow halos. Root knot nematodes affect roots, leading to plant wilting, not leaf powdery growth.
Dark brown, circular spots with yellow halos appear on Bengal Gram leaves during wet years. What is the most probable disease?
Explanation: Ascochyta blight causes dark brown circular spots with yellow halos on leaves during moist conditions. Fusarium wilt typically causes whole plant wilting. Phyllody results in green, leafy flower structures, not leaf spots. Mosaic virus causes mottled or streaked patterns, not distinct circular spots.
A Bengal Gram field exhibits small, misshapen leaves and shortened internodes along with poor pod set. Which nutrient application would help resolve this?
Explanation: Boron deficiency in Bengal Gram leads to small, deformed leaves and poor pod set, so applying boron addresses the problem. Potassium sulfate and magnesium sulfate correct different deficiencies, not boron. Increasing nitrogen promotes general growth but does not fix boron-specific symptoms.
Winding, serpentine tunnels are observed inside Bengal Gram leaves, which later turn brown. What is the main reason for this symptom?
Explanation: Leaf miners create characteristic winding tunnels inside leaves as larvae feed between leaf surfaces. Aphids cause curling or honeydew but not tunnels. Bacterial blight results in water-soaked spots or blights, while rust creates orange pustules, not tunnels.