Home » Plants Diseases and Pests » Black spots under the leaves of Pear, Apple, Quince – Tingidae – Lace Bugs

Black spots under the leaves of Pear, Apple, Quince – Tingidae – Lace Bugs

Tingidae - Lace Bugs under quince tree leaf

If you see many small black spots under the leaves on pears, quince, apple trees, eggplants and the leaves on the top are discoloured and lose their green colour, then you have an infestation of Tingidae (Lace Bugs).

Φύλλο Αχλαδιάς - Μαύρα Στίγματα
Pear leaf. Black spots on the bottom. Discoloration on the top.

The Tingidae family of insects, often referred to as Lace Bugs, are very small insects that infest the underside on apple leaves (apple, pear, quince), but also the eggplants. There are more than 2000 different species.

Lace in English means lace. Insects are called lace insects because both their thorax and wings are delicate and resemble lace.

Symptom of infestation

Μαύρα στίγματα κάτω από τα φύλλα σε Αχλαδιά, Μηλιά, Κυδωνιά
Pear leaf. Black spots on the underside from Tingidae (Lace Bugs).

Many small black spots appear on the underside of the leaves which are usually shiny.

Φύλλο Αχλαδιάς. Μαύρα στίγματα στο κάτω μέρος από έντομα Tingidae (Lace Bugs).
Pear leaf. Discoloration on the upper part by Tingidae (Lace Bugs).
Μελιτζάνα. Αποχρωματισμός στο επάνω μέρος από έντομα Tingidae (Lace Bugs).
Eggplant leaf. Discoloration on the upper part by Tingidae (Lace Bugs).

The upper part of the leaves shows discoloration and in some places they seem to have a silvery tint.

If Tingidae (Lace bugs) have infested much of the leaves of a tree or plant, the foliage of the tree or plant will turn from green to white or silvery.

Trees and vegetables affected

Lace bugs usually attack pear trees, apple trees, quince trees (the apple trees) and of vegetables, eggplants.

Season of infestation

Tingindae insects attack tree leaves when the climate is warm and dry. This occurs in the summer months. From July to August.

Risk of infestation

If the insects have infested a small number of leaves, then there is practically no danger to the trees or plants.

But if they have infested the majority of the leaves, then things change.

The tree may have reduced fruit set.

It may shed the affected leaves.

The good news is that the next year, the tree will produce new leaves and continue to grow normally.

Life cycle of the insect

Most insects in the Tingindae family are born grow up and die on the same tree.

Tingidae (Lace Bugs)
Tingidae (Lace Bugs). One of 2000 species.

Most species have one or two generations per year. Some, however, have multiple generations. Most species overwinter as adults. Some species overwinter as eggs or nymphs. Species in this group, have incomplete metamorphosis as the incomplete phases of the insect resemble those of the adult insect. The difference is that the immature insects are smaller and without wings.

The insect life cycle lasts from 30 to 40 days.

In the spring, adult insects fly to host trees and begin feeding on the new leaves. They mate and lay clusters of small eggs on the underside of the leaves near the central leaf vein.

Some species will not lay their eggs deep in the leaf tissue. Others lay them deep and seal them with a brown substance.

The eggs will hatch into nymphs after about 2 weeks. The nymphs feed for 3 to 4 weeks and go through 5 stages as they grow. They leave their skins attached to the underside of the foliage.

Once they become adults in winged insects, they will mate and lay a second generation of eggs that will produce new insects that will feed until late summer and early fall.

The adults have needle-like mouthparts that they use to suck the sap from the underside of the leaves. The corresponding upper part of the leaves becomes discoloured and ceases to be green.

The black spots seen on the lower part of the leaves are the insect’s apocryphae.

Sources

Tingidae

How to identify and control lace bugs

Tags: APPLE TREEBUGSEGGPLANTENEMIESLACE BUGPEAR TREEPLANT DISEASEPLANTS ENEMYQUINCE TREETINGIDAE

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