Hello, I'm an expert in entomology, the study of insects. When it comes to the Harlequin ladybird, also known as the Asian lady beetle, there's a bit of a nuanced answer to the question of whether they are poisonous to humans.

Harlequin ladybirds, Harmonia axyridis, are not inherently poisonous, but they can be a source of irritation or allergic reactions in some individuals. These beetles can emit a defensive secretion when they feel threatened. The fluid contains alkaloids that can cause a volley of symptoms in sensitive people, ranging from skin irritation to more severe allergic reactions. However, it's important to note that the majority of people do not have a reaction to these beetles.

In terms of toxicity, ingesting a large number of these beetles could potentially cause stomach upset, but this is not a common occurrence. It's always best to avoid handling any insects if you're unsure about their potential effects on you.

So, to summarize, while Harlequin ladybirds are not poisonous in the traditional sense, they can cause discomfort or allergic reactions in some people due to their defensive secretions.

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However Harlequin ladybirds chiefly eat aphids they are a potential benefit to gardener and farmer alike. They are not harmful to humans, pets or property, they do not carry disease, they are not poisonous and they don't breed indoors.read more >>