17 October 2012
Cross-striped Cabbageworm Caterpillar
Caterpillars can be a huge problem, especially when they find their food of choice. Fortunately, if you catch it early enough, there is a good solution. Bacillus thuringiensis (Bt) is a bacteria that is a biological pesticide for controlling caterpillars. Because B. thuringiensis is a bacteria and has little or no effect on humans, animals and beneficial insects, it is considered environmentally-friendly. Bt is probably the active ingredient in all products that are labelled to control caterpillars. These products are usually a liquid spray applied to plants, which then needs to be ingested by the caterpillars to be effective.
Personally, I have just decided to let the caterpillars have the broccoli this time. It was just a few plants, but next time I will be prepared. In the meantime, I will remain vigilant for signs of the next attack.