The trees are all heathly and within the last two days 4 of our willow trees leaves have turned yellow and look sickly.  Can not see any sign of anything on the tree to tell what is causing this.  We hope you can help so that it does not go to the other 9 willow trees.  They were so lush and green.
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2 Answers

after the sun has passed mix up 1 teasp liquid hand soap & 1 qt water mix & spray.
by (150k points)
Where are they planted?  I hope you have a huge yard as willow tree roots search out water sources like plumbing pipes, sewer pipes, etc.  They are stronger than concrete!  Do you happen to have a septic tank/leach field.  the roots could have entered either and are showing the signs of this.

If the four trees are closest to a neighbor this could be the sign of overspray.  Did the neighbor use any Roundup lately.

Have you checked the leaves for any pests?  Any borers creating holes in the trunk?

Why spray with soapy water until you know what it is causing the problem?  Take a sample of the leaves to the county extension office and have them determine what is going on before you treat the trees with anything.
by (13.4k points)

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