In tea, we call it resistance—the pests learn to survive, like children learning to dodge a scolding. You must rotate chemicals, like rotating musicians in a band, so the beat keeps changing. What truly makes me say this is watching a whole hillside of tender leaves ruined one season, all because we got lazy and used the same solution. Now, my field manager and I share a morning chiya and a ledger of sprays, as careful as tuning an instrument.
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