What I have noticed so far is that when these greens start to enter the harvest period, they will emit a "delicious" aroma and the caterpillars can smell it. So, when the harvest period is approaching, we have to be around these greens more often to monitor the movement of the caterpillars! I often catch some caterpillars who are ahead of me in harvesting those greens!
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i often go out with big pincers and remove them all in the morning. but then there are too many for me to do that. they strip the plants bare!!
naughty caterpillars