Question: What is the diagnostic symptom of infestation of stem borer of maize? (IBPS AFO 2023)
Options:
Caterpillars feed on the leaves and bore into the stem and cob
Adults and nymphs feed on the crop and damage it to leave
Caterpillars feed on the leaves and cause leaf curl and damage to crops.
Caterpillars feed on leaves and spots on leaves
The diagnostic symptom of infestation of stem borer of maize is caterpillars feeding on the leaves and boring into the stem and cob. This behavior is characteristic of stem borers, as they tunnel into the plant's stems and cob, causing damage to the internal structures.