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Monostira unicostata (Mulsant)
Insecta, Heteroptera, Tingidae .

Almond lace bug

Description, Biology, Life Cycle, Damage, Common Names, Images

- Adult (of the summer generation): small flat bugs, measuring 2.10 x 0.65 mm in the male and 2.0 to 2.1 x 0.70 to 0.75 mm in the female. Rostrum very obvious under the head. 4-segmented antennae. The prothorax and the hemelytra appear lace-like; a median barely visible spot on the hemelytron. The fore legs are inserted into the back of the prosternum. Tarsi 2-jointed.
- Egg: shiny white, elliptical, measuring 0.70 to 0.80 mm x 0.17 mm.
- Nymph: 5 nymphal instars of respective dimensions: 0.3 to 0.4 mm; 0.5 to 0.6 mm; 0.68 to 0.71 mm;0.9 to 1.0 mm; 1.25 to 1.35 mm.

- almond is the preferred host plant of this bug (*) , which may also attack the pear, poplar and aspen (Populus spp.).
- Fecundity of the female: 70 eggs laid singly or in groups; the female inserts its oviscapt into the leaf, close to the main vein.
- Embryonic development lasts 15 to 18 days (1st generation) or 10 to 12 days (following generations).
- The 5 nymphal instars last respectively: 10 to 12 hours, 36 hours, 48 hours, 48 and 72 hours.

[R]Life Cycle
In general, 4 following generations occur in southern Portugal: the 1st in June, the 2nd in July-August, the 3rd in August and the last (hibernationg generation) in August-September.

- The tree suffers from feeding punctures which give the leaf a yellow flecked aspect, egg-laying scars and abundant excrement, visible in the shape of black spots strewn across the leaf lamina and reduced photosynthetic activity. Often, the attacked leaves drop, especially during dry and hot weather. This drop disturbs the normal development and ripening of the fruit.
- On hatching from the egg, the newly emerged bugs widen the egg-laying incision which becomes an easy entry point for pathogenic fungi.
- Most damage occurs during high-summer and is caused by the 3rd and 4th generation bugs.

[R]Common Names
DE: Mandelbaumwanze ES: Chinche del almendro, Falso tigre del almendro FR: Tigre de l'amandier IT: Cimicetta del mandorio PT: Piolho da amendoeira GB: Almond lace bug

[R] Images

  1. Monostira unicostata (Mulsant) (BASF)
    Colony under leaf of almond

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