Cherry Slimy Sawfly (Caliroa Cerasi)

Pest Type: Fruit Pests

Row: Hymenoptera – Hymenoptera

Family: true sawflies – Tenthredinidae

It is found everywhere. It damages cherries, cherries, pears, hawthorn, less – plums, thorns, quinces, mountain ash, cotoneaster, apple, and ii.

The female is 5-6 mm long, the male is 4-5 mm, the body is black, shiny, legs are black, only brownish in the middle; wings are transparent, with a slightly darkened median band. The egg is 0.6 mm in size, oval, pale green. Larva – 9-11 mm, yellow-green, head small, brown or black; the front of the body (thoracic segments) is significantly expanded; legs – 10 pairs; the larva is covered with shiny black mucus and only at the last age loses it and becomes Bright. Pupa 6 mm long, yellow-white, in a dense oval earthen cocoon.

The eonimph larvae overwinter in an earthen cocoon in the soil at a depth of 6-15 cm. In the forest-steppe pupate in late May-early June, in the southern strip in the first half of May. A significant part of the larvae (sometimes up to 50%) remains in a state of diapause for repeated wintering. 7-10 days after the start of the pupation, a massive exit of imago from the soil is observed. On the second and third days after the departure, the females lay their eggs, placing them one at a time in the incisions made by the ovipositor in the incisions in the pulp of the sheet from the underside. The egg is clearly visible in the form of a brown tubercle. With mass reproduction of the pest on one sheet, there are 10-30 eggs laid by different females. It multiplies more often parthenogenetically. For 7-8 days of life, the female lays 50-75 eggs.

Embryonic development lasts 7-13 days. The mass revival of larvae occurs more often in the second half of June – early July. The larvae crawl onto the upper side of the leaf and become covered with mucus, which protects them from drying out. After 15-20 days, after 6-7 centuries, the larvae complete development and pass into the soil.

In Polesie and the northern zone, the Forest-Steppe develops in one generation, in the southern Forest-Steppe and the Steppe – in two. Years and laying of eggs of the second generation occur in the second half of August. The development of second-generation larvae often lasts until the end of September – beginning of October. Younger larvae gnaw out the flesh of the leaf in small spots, older ones skeletonize leaves, leaving only a network of veins. The second generation of the pest does more damage. The cherry mucous sawfly is a halophilic species, in connection with which it actively populates thinned stands, as well as slopes of the southern exposure. Severely damages the leaves on the south side of the crown of trees.

A significant role in reducing the number of the sawfly is played by lumps of parasites. So, the laid eggs actively infect the trichogram. The larvae infect a number of riders from the ichneumonids and eulophids and tahin flies.

Protective measures. Autumn plowing and spring loosening of soil in aisles and near-trunk circles. Loosening of the soil during the period of mass transition of larvae to pupation. When the pest colonizes more than 10-15% of the leaves – treatment with insecticides or biological products.

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