Ladybird's favorite food is Aphid (greenfly/blackfly) which attack plants. Ladybirds are a beneficial insect and gardners and Horticulturalists encourage them.
it is not harmful but it is helpful
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no
it can be helpful or harmful
if they are nice or harmful
Because nothing about them is harmful. They eat plants and fly around, that's it.
sometimes they are helpful and harmful.
Ladybug beetles are certainly not harmful. They are beneficial to farmers because they eat many aphids that would otherwise damage crops. They don't even bite people.
This site is stupid and useless :P
Sandpaper is both helpful and harmful.
They are useful to farmers because ladybug/ladybirds eats the aphids on the crops which sucks the sap of the plant.
they are helpful not harmful to plants