Definition of top sickness
: a boron deficiency disease of tobacco marked especially by a pale green color appearing first in the leaves of the terminal bud and by bases that are paler than the tips
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“Top sickness.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/top%20sickness. Accessed 26 Sep. 2021.
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