Spotting & Solving Leaf Problems Quiz Quiz

Challenge your understanding of key leaf-related disorders affecting Bengal gram crops and learn about their management. This quiz is designed for growers and students eager to recognize and address common issues.

1. Identifying Yellowing in Bengal Gram Leaves

   Which nutrient deficiency is most commonly associated with a uniform yellowing of older Bengal gram leaves, especially during early vegetative growth?

   1. Calcium excess
   2. Nitrogen deficiency
   3. Iron deficiency
   4. Manganese toxicity

   Explanation: Nitrogen deficiency typically causes uniform yellowing (chlorosis) of older leaves in Bengal gram. Iron deficiency usually shows as interveinal chlorosis in younger leaves. Manganese toxicity does not present as general leaf yellowing. Calcium excess rarely causes foliar yellowing symptoms and is less likely to affect Bengal gram leaves.

2. Leaf Spot Recognition

   If a Bengal gram field shows small, circular brown spots with concentric rings on its leaves, which disorder is most likely present?

   1. Zinc deficiency
   2. Ascochyta blight
   3. Powdery mildew
   4. Fusarium wilt

   Explanation: Ascochyta blight causes distinctive, round brown spots with concentric rings on Bengal gram leaves. Fusarium wilt primarily affects roots and causes wilting rather than leaf spots. Powdery mildew presents as white powdery patches, not spots. Zinc deficiency is more associated with interveinal chlorosis and stunted growth, not spot development.

3. Effects of Water Stress

   What leaf symptom may indicate waterlogging stress in Bengal gram plants?

   1. Leaf tip burn only
   2. Purpling of stem and leaves
   3. Wilting and yellowing of lower leaves
   4. Sudden upward leaf rolling

   Explanation: Wilting and yellowing of lower leaves can signal waterlogging stress in Bengal gram because roots are unable to supply sufficient oxygen. Purpling tends to indicate phosphorus deficiency. Leaf tip burn alone is more typical of fertilizer burn. Sudden upward leaf rolling is usually seen in response to drought, not excess water.

4. Leaf Curl in Viral Disorders

   Severe leaf curling, puckering, and yellow mosaic patterns on Bengal gram leaves are classic signs of which disorder?

   1. Chickpea stunt virus
   2. Rust disease
   3. Potassium toxicity
   4. Root-knot nematode

   Explanation: Chickpea stunt virus typically causes leaf curling, puckering, and yellow mosaic symptoms. Root-knot nematode affects roots and causes stunted growth but not this leaf pattern. Potassium toxicity rarely produces puckered leaves and mosaics. Rust disease is characterized by pustules on the leaf surface, not curling or mosaic symptoms.

5. Leaf Drying and Necrosis Diagnosis

   Which disorder is most likely if Bengal gram leaf tips and margins dry out and turn brown, particularly during dry, hot weather?

   1. Boron toxicity
   2. Downy mildew
   3. Potassium deficiency
   4. Manganese deficiency

   Explanation: Potassium deficiency often results in drying and browning of leaf tips and margins, especially in stressful dry conditions. Downy mildew is rare in Bengal gram and produces downy fungal growth, not dry necrosis. Boron toxicity usually shows as chlorosis or burnt leaf edges, but is less common. Manganese deficiency signs differ and rarely present as marginal drying.