Answer: Sudden wilting is usually a sign of water stress - too much or too little. Dig down into the soil to make sure the ground is moist but not soggy wet near the rootmass. Drip systems are usually efficient but a single clogged emitter can change the amount of water being delivered. Digging down into the soil will solve the mystery. I would try flooding the soil with a hose (after first checking the root area as above). Flooding the soil will provide immediate moisture and may help your tree recover. Good luck with your mulberry!
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