Cowbane aka northen water hemlock has a yellowish liquid in its root that is very poisonous. A single bite of the root can be sufficient to cause death in a man and 230 gram of the root is sufficient to kill a horse.
- Wikipedia Cicuta virosa , https://en.wikipedia.org/wiki/Cicuta_virosa
 Therefore all things whatsoever ye would that men should do to you, do ye even so to them: for this is the law and the prophets.
 Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat:
 Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.
 Beware of false prophets, which come to you in sheep’s clothing, but inwardly they are ravening wolves.
 Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?
 Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.
 A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
 Wherefore by their fruits ye shall know them.— KJV, Matthew 7:12-20
Evil fruit thorns and thistles and good fruit figs and grapes .
Also notice that Jesus says that many take the broad way  indicating that the majority of professing Christians are evil fruit.
There was a man in the land of Uz, whose name was Job; and that man was perfect and upright, and one that feared God, and eschewed evil. — KJV, Job 1:1
How should we then deal with evil fruit.
We should avoid it.
Depart from evil, and do good; seek peace, and pursue it. — KJV, Psalms 34:14
We should depart from evil.