Stem application in cotton is followed for the management of:

Correct option is C

✅ (c) sucking insects: • Stem application involves applying systemic insecticides (like Imidacloprid) directly to the stem or base. • Controls sucking pests such as whiteflies, aphids, and jassids effectively. • Reduces foliar spraying and insecticide drift.
❌ (a), (b), (d): • Not effectively managed by stem application.