What product is mentioned as a method to treat external parasites on chickens?

Diatomaceous earth is often utilized as an effective method to treat external parasites on chickens. It consists of finely ground fossilized algae, which is abrasive and can damage the exoskeletons of parasites such as mites and lice. When the powder is applied to the chickens’ feathers or the environment, it can help to dehydrate and ultimately kill these pests without the use of harsh chemicals. Additionally, diatomaceous earth is safe for chickens when used correctly and can provide a natural alternative to synthetic treatments.

The other products listed may have some uses in poultry care but are not specifically recognized for treating external parasites in the same manner as diatomaceous earth. Insect repellent spray can repel pests but may not be effective in eliminating established infestations. A vinegar blend solution is more commonly used for overall health and sanitation rather than as a targeted treatment for parasites. Petroleum jelly might serve as a barrier or protective coating but does not have the same parasitic control properties attributed to diatomaceous earth.