found yellow and black caterpillars in garden

Question

I found my dahlia leaves eaten away overnight by black and yellow caterpillars or worms. How do I get rid of them?

Answer 1

They can be treated with products containing Bacillus thuringiensis (Bt), a natural bacteria that kill worms/caterpillars without harming plants. Neem oil may be helpful as well. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/using-bacillus-thuringiensis.htm
https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm