calyx spray
noun
: a pesticidal spray applied to fruit trees (as apple and pear) just after the petals fall but before the calyx closes
called also petal fall spray, shuck spray
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“Calyx spray.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/calyx%20spray. Accessed 30 Nov. 2024.
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