Psoroptes

Psoroptes is a genus of parasitic mites within the Psoroptidae family and Sarcoptiformes order. While these are not pests of crops, they are significant agricultural pests that negatively affect livestock productivity. These mites are known as non-burrowing mites because they reside on the skin surface of their hosts, causing a condition known as psoroptic mange or sheep scab.

The host range for these mites is extensive, including sheep, cattle, horses, and rabbits. The parasites cause significant economic losses in the livestock industry by damaging hides, reducing growth rates, causing severe weight loss, and, if left untreated, leading to the death of affected livestock.

The life cycle of Psoroptes is relatively short, usually lasting about two weeks under optimal conditions. It consists of the egg, larva, protonymph, deutonymph, and adult stages. The entire cycle occurs on the skin of the host, where the mites feed on skin secretions, triggering an inflammatory reaction that leads to the formation of crusts and scabs.

Symptoms of infestation include intense itching, restlessness, and the appearance of thick, yellow crusts on the skin. Animals often rub against fences or buildings, leading to hair loss and raw skin areas susceptible to secondary bacterial infections. The rapid transmission rate within a herd makes this pest a serious challenge for animal welfare.

Effective control measures focus on breaking the life cycle through pharmacological and environmental management. Standard practices include: dipping or spraying animals with approved acaricides, using systemic injectable treatments to kill the parasites, and strictly isolating any animals showing symptoms. Proper farm biosecurity is the primary defense against the introduction and spread of Psoroptes.