Explore key causes, symptoms, and management of white leaf disorders affecting Bengal gram crops. This quiz tests your understanding of crop health and diagnosis in agricultural settings.
A Bengal gram field shows leaves developing irregular white patches while veins remain green. Which disorder is most likely responsible for these symptoms?
Explanation: Zinc deficiency typically causes irregular white or pale patches between veins, with veins staying green. Powdery mildew shows white powdery growth rather than internal discoloration. Fusarium wilt causes wilting, not this type of leaf discoloration. Root-knot nematodes primarily affect roots, leading to galls and stunting, not interveinal white patches.
Which early symptom distinguishes zinc deficiency from powdery mildew in Bengal gram plants?
Explanation: Interveinal white patches with green veins are characteristic of zinc deficiency in Bengal gram. Powdery mildew forms a white powdery fungal growth, not just color change. Yellowing and complete margin drying are more general or late-stage symptoms of other problems.
Which management practice is most effective for correcting white leaf symptoms due to zinc deficiency in Bengal gram?
Explanation: Applying a foliar spray of zinc sulfate supplies the needed micronutrient directly. Sulphur dust is for fungal diseases like powdery mildew. Systemic fungicides control pathogens, not deficiencies. Crop rotation may prevent some diseases but does not directly address zinc deficiency.
Low availability of zinc in Bengal gram fields is most often associated with which soil condition?
Explanation: Zinc becomes less available in highly alkaline soils, increasing deficiency risk. Waterlogged and acidic soils can cause other nutrient problems. Low organic matter may contribute but is less directly linked to zinc deficiency than high pH.
If untreated, how can zinc deficiency affecting white leaves alter Bengal gram crop outcomes?
Explanation: Zinc deficiency slows plant metabolism and growth, reducing flower and pod set, thus lowering yields. Leaf curling alone is not the main result, and zinc deficiency does not directly cause lodging or root rot, though poor growth can make plants more susceptible to stress.