Homepage 5 Fruit growing 5 Blackberry 5 Blackberry pests

Blackberry pests

Blackberry Mite

Acalitus essigi Hassan

This mite attacks blackberries and raspberries and often appears in Croatian plantations.

Pest Attack

  • Fruit

Pest Description

Adult mites are worm-like and transparent white. They have two pairs of legs and are very small.

Biology and Life Cycle of the Pest

Adult mites overwinter under bud scales but can also be found on leftover fruits on the plants. Early in spring, they move to the leaves and during flowering, they enter the flower and then the fruit.

Damage Caused by the Pest

Fruits ripen unevenly, are irregularly colored, hard, and tasteless. The mite causes more damage to later varieties of blackberries.

Protection Against the Blackberry Mite

Damage is reduced by proper pruning and the application of sulfur-based preparations in spring. The need for control measures is determined based on the intensity of last year’s attack.

Raspberry Gall Midge

Resseliella theobaldi Barnes

The raspberry gall midge is a pest that occasionally causes significant damage in raspberry and blackberry plantations.

Pest Attack

  • Shoots

Pest Description

Adults grow to 2 to 2.5 mm in length and are ocher-red. Males are smaller than females.

Eggs are whitish.

Larvae are small, up to 3 mm, and reddish.

Pupae are reddish and found in cocoons.

Biology and Life Cycle of the Pest

Larvae overwinter in cocoons in the soil. Adults appear in April and lay eggs in longitudinal cracks on young shoots. Egg development takes 5 to 8 days. Larvae that hatch feed on shoot tissue. Purple zones appear around the affected areas. At the end of development, healthy larvae leave the shoots and burrow into the ground where they spin cocoons and pupate. The development from egg to adult takes an average of 40 to 60 days. There are three generations per year.

Damage Caused by the Pest

Affected shoots dry out. Indirect damage occurs as the pest facilitates the entry of fungi such as Didymella applanata and fungi from the Fusarium, Verticillium, and Coniothyrium genera, significantly increasing the damage.

Protection Against the Raspberry Gall Midge

Since the raspberry gall midge overwinters in the soil, tilling the soil around the plants reduces the number of overwintering pupae.

Raspberry Stem Borer

Coroebus rubi L.

This pest is found in the wild on roses and blackberries.

Pest Attack

  • Leaves and shoots

Pest Description

Adult beetles grow to 8 to 11 mm. They are purple-black.

Larvae are dirty white and grow up to 30 mm.

Biology and Life Cycle of the Pest

Larvae overwinter in the root collar or roots. After overwintering, they move upwards where they pupate in the shoot. Development takes about two weeks. Adults appear in May and start feeding on the leaves. After feeding, females lay eggs on the shoots. Larvae develop from these eggs.

Damage Caused by the Pest

Damage is evident in spring after the larvae have overwintered in the shoot. The larvae bore a tunnel downwards in the shoot. In affected shoots, vegetation does not start, and they break easily. In severe infestations, up to 90% of fruit-bearing shoots can be destroyed.

Protection Against the Raspberry Stem Borer

This pest can be controlled by cutting and burning affected shoots, including the part where the pest is located.

During winter, it is necessary to dig up the affected root collar and cut and burn the infested shoots.

Using healthy planting material is a preventive measure to prevent the introduction of the pest into plantations. Around plantations, it is necessary to destroy wild roses and blackberries.

Raspberry Beetle

Byturus tomentosus Fabr.

The raspberry beetle is a pest that attacks both raspberries and blackberries.

Pest Attack

  • Flower buds, flowers, and fruits

Pest Description

Adult beetles have light brown bodies covered with grayish hairs. They are elongated and oval, growing 3.5 to 4 mm in length. Antennae are composed of 11 segments.

Eggs are elongated and elliptical, white or yellowish, about 1 mm in length.

Larvae are brown and covered with yellowish hairs. They grow up to 8 mm in length. They have three small thoracic legs. The head is prominent and dark in color.

Pupae are white and 3.5 to 4 mm long.

Biology and Life Cycle of the Pest

Adults overwinter, usually in the soil. They become active and reappear in late April and May when they start feeding on flower buds and flowers. Females lay eggs in flower buds and later in fruits. Each female lays 80 to 100 eggs. Larvae develop in 8 to 10 days and feed inside the fruit. Larval development takes about a month and a half. In warm and dry weather, adults are more active, causing more damage and laying more eggs, but high temperatures and low humidity negatively affect embryonic development. There is one generation per year.

Damage Caused by the Pest

Adults destroy flower buds and flowers by gnawing them. Eggs laid in buds cause them to dry out. The larvae damage the fruit as they develop and feed inside. The pest particularly attacks early raspberry varieties.

Protection Against the Raspberry Beetle

The raspberry beetle is controlled by hoeing the soil around the raspberry plants in winter since it overwinters in the soil. Insecticides based on fosalon and endosulfan can be used before flowering and oviposition when the pest starts causing damage to the buds. White sticky traps are used to detect and monitor the presence and number of this pest.

Rhododendron Leafhopper

Typhlocyba rosae L.

This pest can cause significant damage to both raspberries and blackberries. It is a pronounced polyphagous pest.

Pest Attack

  • Leaves and shoots

Pest Description

Adults are 3 to 3.5 mm long. Their bodies are greenish-yellow, narrow, and elongated. They have a notably wide head.

Larvae are cream-colored.

Biology and Life Cycle of the Pest

Eggs overwinter under the host’s bark. In early spring, larvae hatch from the eggs and move to the leaves where they suck sap. Development takes about 30 days. Adults of the first generation appear in late May and June. They live quite long – up to two months. They lay eggs on the leaves from which a much larger second generation develops, causing the most significant damage. Adults of the second generation appear in September, and in coastal areas, they can be found until November. They lay eggs that overwinter.

Damage Caused by the Pest

On the leaves where they suck sap, individual whitish spots initially appear, which then merge, causing the entire leaf to become mottled, eventually turning pale (dechlorophyllation) and curling. On the underside, numerous skins and live insects can be observed. Damage also occurs from egg-laying in shoots, causing them to stunt. It causes particularly significant damage in enclosed spaces in the absence of natural enemies.

Protection Against the Rhododendron Leafhopper

Cutting infested shoots in winter only reduces damage. Winter spraying kills the eggs using oil-based organophosphorus insecticides.

The decision threshold is considered to be more than 50 pests per 100 leaves.

Biological control includes natural enemies.

Lesser Significant Pests of Blackberries

Other lesser significant pests of blackberries include:

  • Raspberry Leaf Gall Midge (Dasyneura plicatrix H. Lw.)
  • Raspberry Leaf Miner (Incurvaria rubiella Bjerk.)
  • Raspberry Leaf Roller (Notocelia udmanniana L.)
  • Raspberry Stem Borer (Pennisetia hylaeiformis Lasp.)
  • Two-Spotted Spider Mite (Tetranychus urticae Koch.)
Reklama EN 1Reklama EN 1
Reklama EN 2Reklama EN 2
Reklama EN 3Reklama EN 3