Anthriscus psyllid

The Anthriscus psyllid (Trioza anthrisci) belongs to the order Hemiptera and the family Triozidae. It is a tiny jumping insect, outwardly resembling a miniature cicada.

Adults are about 2-3 mm long. Their coloration varies from light green to brownish, allowing them to camouflage effectively on host plants.

The wings of the adults are transparent with characteristic venation, typical for the family Triozidae. The head is equipped with a powerful piercing-sucking mouthpart.

Nymphs are sedentary, flattened, and often covered with waxy secretions, making them difficult to spot on the undersides of leaves.

The eggs are small, yellowish or orange, and are laid by females directly on the vegetative parts of plants near the leaf veins.

The primary hosts are members of the Apiaceae family. It causes the most significant damage to carrots, parsnips, and related wild species.

The insect is an obligate phytophage. It feeds by sucking cell sap from the tissues of leaves and young shoots of the plant.

In addition to direct mechanical damage, the psyllid can transmit dangerous phytoplasma diseases that cause deformation and stunted growth.

Heavy infestation leads to a sharp decrease in the photosynthetic activity of the plant, which negatively affects the yield of root crops.

In conditions of high population density, this pest is capable of destroying a significant portion of crops in the early stages of vegetation.

Adults typically overwinter in the imago stage on conifers or in thick forest litter, which provides them with reliable shelter.

In early spring, with the onset of stable positive temperatures, the insects leave their wintering sites and migrate to cultivated plants.

Mass emergence and colonization of carrot fields usually coincide with the phase of the first true leaves, making plants most vulnerable.

One or two generations can develop per season, depending on the temperature regime of the region and the availability of food sources.

By mid-summer, the number of active individuals often decreases, but the damage caused in spring remains visible on plants until harvest.

The first sign of infestation is the characteristic curling of leaf margins, which become curly and often turn yellow or red.

Upon careful inspection of the underside of the leaf blade, one can find the nymphs themselves and their excretions, known as honeydew.

Damaged plants noticeably lag in growth, and their roots become small, coarse, and unsuitable for long-term storage.

• Deformation of leaf blades.
• Discoloration or reddening of tissues.
• Stunted growth of the aerial part.
• Appearance of sticky honeydew.

Severe tissue damage promotes secondary fungal infections, which exacerbate the overall decline of the plant.

Agrotechnical methods include crop rotation and spatial isolation of carrot fields from the pest's wintering sites (coniferous plantings).

An effective protection method is the use of non-woven cover materials during the period of active insect migration in the spring.

Regular destruction of Apiaceae weeds around garden beds significantly reduces the food base and the population of the pest.

When the economic threshold of harmfulness is exceeded, contact-systemic insecticides permitted for vegetable crops are used.

It is important to spray strictly according to the instructions, alternating preparations from different chemical groups to prevent resistance.