Help! Today I discovered a cluster of ants on an Eastern White
Pine,
and looking closer, noticed several green caterpillars with
brown heads
covering the tip of branches nestled among the new growth.
They were
about one-half inch in length. I pulled off all that I saw.
Should I
be spraying or has the damage been done? The tree appears
healthy
otherwise.

Any suggestions appreciated.

Probably the pine sawfly (but could be a webworm). The sawfly is
an exotic pest. There are biological controls, and any pyrethrin
or BT pesticide will control both. They eat the needles, and if
you have removed all the critters that's all you need to do.
Keep an eye out for any critters that come in (you may have a
pine in the neighborhood that's infested) and pick them off.

Your bonsai will recover, so don't worry.

Jim Lewis - - Tallahassee, FL - The phrase
'sustainable growth' is an oxymoron. - Stephen Viederman

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